最新刊期
      卷 35 ， 期 11 ， 2015
      • Ma Guanghui,Li Runxia,Bai Yanhua,Li Rongde
        Vol. 35, Issue 11, Pages: 1121-1125(2015) DOI: 10.15980/j.tzzz.2015.11.001
        摘要：The fracture behavior of Si particles in Zl101 alloy after tensile testing at-60℃and 20℃ was analyzed.The results show that the number of damaged Si particle is increased in the ZL101 alloy at a lower temperature.There exist lots of dislocations motion during the plastic deformation,which are piled up in ahead of Si particles,leading to the Si particles fracture.Due to the increase of shearing modulus with the decrease of temperature,the resistance of dislocation motion is increased rapidly at the local deformation zone with the dislocation density increase,and the dislocation multiply easily outside the local deformation zone,so the plastic deformation of ZL101 is more homogeneous at low temperature.  
        关键词：Al-Si Alloy;Si Phase;Dislocation;Plastic Deformation;Low Temperature   
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        发布时间：2023-12-18
      • Qin Qingdong,Li Wei,Zhao Yuguang
        Vol. 35, Issue 11, Pages: 1125-1129(2015) DOI: 10.15980/j.tzzz.2015.11.002
        摘要：The growth charicteristics of Mg2 Si in Al melts was described under varied cooling rates.The results show that Mg2 Si particles present equiaxed grain at the lower cooling rate.With the increase of cooling rate,the primary grain is transformed into dendrite with a refined size,however,the size along to dendrites’ direction becomes a longer.With the cooling rate further increase,the size of primary phase becomes the finer,while the length of dendrites’ direction still exceed 200μm with growth in form of facet.However,under the super-cooling degree and super cooling rate condition,the growth modes of primary Mg2 Si in Al melts is changed from facet to non-facet.The calculation results show that the critical cooling rate of growth manner transforming is 1.169×106℃/s.  
        关键词：Mg2Si/Al Alloys;Cooling Rate;Growth Manner;Microstructure   
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      • Liu Liang,Qi Jingang,Wang Bing,Zhao Zuofu,Shang Jian,Zhang Yue
        Vol. 35, Issue 11, Pages: 1130-1133(2015) DOI: 10.15980/j.tzzz.2015.11.003
        摘要：CoCrFeNiVxhigh-entropy alloys（xdenotes the atomic content of V element when the atomic content of Co,Cr,Fe and Ni is 1,respectively）were prepared by vacuum arc melting.Effects of V content on microstructure and mechanical properties of the alloy prepared were investigated by optical microscope,X-ray diffraction（XRD）,scanning electron microscope（SEM）,micro-hardness testing and compression testing.The results show that the alloys exhibit a single FCC crystal structure with typical dendritic morphology with xless than 0.5.With increasing in x,the dendritic morphology is transformed to granular shape,and the crystal structure of the alloys consists of FCC,BCC,and Co1.9V3.1intermetallic compound with x≥1.The hardness of CoCrFeNiVxhigh entropy alloys is increased with increasing in x.Meanwhile,the ductility is decreased and brittleness is enhanced.  
        关键词：High Entropy Alloy;Vanadium;Microstructure;Mechanical Properties   
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      • Vol. 35, Issue 11, Pages: 1129(2015)
        摘要：<正>由加拿大Martinrea Honsel集团投资的玛汀瑞亚宏泽铝制配件（余姚）有限公司汽车铝压铸件项目二期工程已经开工建设。据悉,玛汀瑞亚宏泽汽车铝压铸件项目一期已建成投产。项目一期投资3 200万美元,主要拥有铝合金熔化炉、低压铸造机、金属调质系统、混砂设备、热处理系统、机械加工设备等,生产铝合金汽车支架。玛汀瑞亚宏泽铝制配件（余姚）有限公司于2013年10  
          
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        发布时间：2023-12-18
      • Vol. 35, Issue 11, Pages: 1170(2015)
        摘要：<正>日前,澳大利亚调查机关就原产于中国的铝制车轮反倾销反补贴调查复审一案发布最终调查报告和调查结论对我国铝制车轮生产商征收从2.2%到50.9%不等的反倾销反补贴税率。澳大利亚对我国的五家抽样企业的合并税率分别为浙江跃岭股份有限公司50.9%,宁波宝德轮业有限公司19.9%,浙江今飞凯达轮毂股份有限公司9.0%,中信戴卡股份有限公司8.4%,江苏耀中铝车轮有限公司2.2%。  
          
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        发布时间：2023-12-18
      • Cao Fenghong,Chen Yungui,Ding Wucheng,Cui Zhiming,Dou Shaoxu
        Vol. 35, Issue 11, Pages: 1133-1136(2015) DOI: 10.15980/j.tzzz.2015.11.004
        摘要：The microstructure and fracture of as-cast Mg-5Sn-3Al-2Zn alloy were analyzed by XRD（X-ray diffraction）,SEM（scanning electron microscopy）,OM（optical microscopy）.The results reveal that Mg-5Sn-3Al-2Zn-xCa alloys are composed mainly ofα-Mg,Mg2 Sn,CaMgSn,Al2 Ca phase.With the Ca addition of 1.0%,the ambient mechanical properties of the alloy reach up to the maximum value,while the Ca content of 2.0%,a large thick needle or rod-like CaMgSn or Al2 Ca phase can be observed in the matrix alloy,resulting in the obvious deterioration of the mechanical properties of the alloy.In addition,the fracture mechanism is characterized by cleavage and quasi-cleavage fracture.  
        关键词：Mg-5Sn-3Al-2Zn Alloy;Microstructure;Mechanical Properties;Mechanism Of Fracture   
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      • Li Bing,Chen Wei
        Vol. 35, Issue 11, Pages: 1137-1139(2015) DOI: 10.15980/j.tzzz.2015.11.005
        摘要：The working environment of transmission shaft is very harsh,therefore,the performance of the drive shaft directly affects the performance of the whole vehicle.Traditional drive shaft manufacturing method such as turning machining method,not only wastes materials,but also destroys the metal flow line,which easily leads to stress concentration to influence its service life.A double headed and extrusion forming process was presented.The results reveal that the process exhibits greatly superior to the traditional process in saving materials,improvement of processing speed and properties of the product.  
        关键词：Drive Shaft;Machining;Double-end Extrusion   
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      • Huang Wen,Zhang Zhuoran,Zhang Xingzhong,Yang Ladao,Gao Qi
        Vol. 35, Issue 11, Pages: 1139-1142(2015) DOI: 10.15980/j.tzzz.2015.11.006
        摘要：By analyzing the deformation of the billet in straightening zone,an analyzical solution for roller reacting forces in multipoint straightening.Through taking apiece of billet in the first straightening interval as free body and tracing its movement and analyzing its deformation,the equilibrium equations of the free body were established successively at the time when the billet piece was located at each straightening reacting.The simultaneous equations are solved,and the straightening reacting forces of the straightening roller of multipoint straightening can be obtained,which provids a reference for the design of straightening roller.  
        关键词：Continuous Casting;Multipoint Straightening;Straightening Reacting Force   
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        发布时间：2023-12-18
      • Xu Yu,Li Zhuang,Wang Engang,Zhang Xingwu
        Vol. 35, Issue 11, Pages: 1143-1146(2015) DOI: 10.15980/j.tzzz.2015.11.007
        摘要：Effects of electromagnetic stirring（EMS）parameters,such as electromagnetic stirring intensity and secondary cooling water volume,on the GCr15 bearing steels prepared in self-developed continuous casting machine were investigated to improve the solidification structure.The results indicate that with electric current of 250 Aand frequency of 12 Hz,the dendrite in solidification front of the liquid steel can be broken and melt.Due to the decrease of liquid temperature gradient to increase the composition super cooled degree,the columnar grain is transformed into equiaxed grain.With the secondary cooling intensity increased from 2.0m3/h to 3.5m3/h,finer dispersed and compact equiaxed grain structure in the centre of billet can be observed.Furthermore,the secondary dendrite arm spacing is decreased,and the carbon and chromium in the billet are more uniformly distributed with EMS.  
        关键词：GCr15Bearing Steel;Electromagnetic Stirring;Secondary Dendrite Arm Spacing;Temperature Gradient   
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        发布时间：2023-12-18
      • Zhang Lei,Huang Xingmin,Weng Yuming,Yong Wei,Wang Lianghui
        Vol. 35, Issue 11, Pages: 1146-1150(2015) DOI: 10.15980/j.tzzz.2015.11.008
        摘要：Effects of destabilized and tempered treatment on microstructure and wear resistance of Cr15 high chromium cast iron（HCCI）were analyzed.The results reveal that destabilizing treatment at 950℃and 1 000 ℃ can promote the secondary carbide precipitation and martensite’s transformation.Asquenched HCCI consists of martensite,retained austenite,primary and secondary carbides,improving the matrix hardness.The low-temperature tempering can relief the stress concentration to take acceptable toughness.Under the experimental condition,quenched at 1 000℃for 3hfollowed by air quenching and tempered at 250 ℃for 6h,the Cr15 HCCI has excellent mechanical properties.Finally,hardness and unnotched impact absorbing energy reach 61.4 HRC and 7.3J,respectively.In dry friction wear state,the as-cast and as-quenched HCCI exhibit mainly abrasive wear.As-tempered HCCI can improve the toughness,and the wear mechanism is mainly characterized by adhesive wear.After 6hdry friction,the wear mass loss is decreased from 43.0mg to 28.8mg.  
        关键词：High Chromium Cast Iron;Destabilized Treatment;Hardness;Wear Resistance   
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        发布时间：2023-12-18
      • Yu Xiaolu,Hua Kaixuan,Huang Chao
        Vol. 35, Issue 11, Pages: 1151-1153(2015) DOI: 10.15980/j.tzzz.2015.11.009
        摘要：Based on the dynamic materials model,the processing maps of Mo1 material in the states of semi-solid and solid were established.The instability zones of flow behavior can be recognized by maps.When deformation rate is less than 40%,the changes of flow stress is sensitive mainly to strain rate,while deformation rate is more than 40%,the changes of flow stress is sensitive mainly to temperature.Meanwhile,the reasonable hot processing windows were presenetd.When strain is 0.1,that is the beginning of the hot processing,the reasonable window is 9801 375 ℃ and 100.01s-1,and While strain is 0.5,that is the deformation to a certain extent,the reasonable window is:9001 270 ℃ and0.011.8s-1.  
        关键词：Mo1Material;Deformation Rate;Processing Map;Processing Parameters   
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        发布时间：2023-12-18
      • Vol. 35, Issue 11, Pages: 1142(2015)
        摘要：<正>近日,秦皇岛市举行产业链招商集中签约仪式,全市34个重点项目完成签约,总投资额达453.8亿元。中信集团投资3亿元的"凯斯曼二期和模具中心项目"位列其中,新增年产2 700套铝合金车轮模具。据了解,中信集团旗下的凯斯曼秦皇岛汽车零部件制造有限公司（下称"秦皇岛凯斯曼"）,在秦皇岛投资了"年产157万件压铸气缸头盖、65万件差压铸造转向节支架项目"  
          
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      • Vol. 35, Issue 11, Pages: 1150(2015)
        摘要：<正>近日,浙江万丰奥威汽轮股份有限公司（"万丰奥威"）公布三季度报,2015年19月,公司实现营业收入41.35亿元,同比增长3.93%;净利润4.12亿元,同比增长36.08%。其还预计全年净利润为5.226.53亿元,同比增长20%50%。万丰奥威表示,第四季度世界形势依旧复杂,中国经济将持续"新常态",汽车产业增长幅度呈下降趋势,公司通过市场结构的优化、工艺技术的改进、内部管理的挖潜及已投产能的不断释放,预计2015年度业绩较去年同期仍会稳健提升。  
          
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      • Vol. 35, Issue 11, Pages: 1162(2015)
        摘要：<正>在"十二五"期间,我国镁行业面对错综复杂的经济环境和充满变数的市场,取得了来之不易的成绩,同时也为即将开启的"十三五"打下了基础、确立了方向。中国工程院院士左铁镛在出席"镁业分会第十八届年会及2015年全国镁行业大会"时说:"十三五规划中,已将包括铝、镁、钛等高性能的轻金属结构材料列为新兴产业发展,即将出台一部白皮书来具体说明轻金属的发展未来,该白皮书中将有涉及镁产业的相关内容。"当前,节能减排已经成为世界各国共识的问题,通过对材料的应用减轻移动式工具的质量是镁产业今后发展的一大方向。  
          
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      • Vol. 35, Issue 11, Pages: 1173(2015)
        摘要：<正>2015年10月15日,中国塑料机械工业协会组织国内机械行业及半固态镁合金材料方面的知名专家组成的鉴定专家委员会,对伊之密自主研制的"UN650MGII半固态镁合金注射成型机"新产品进行了鉴定。专家委员会对该项目的技术水平给予了高度评价,一致认为该项技术和设备各项指标及性能达到国际同类产品的先进水平。"UN650MGII半固态镁合金注射成型机"汇集了伊之密在半固态镁合金领域的主要技术力量,融合国际先进技  
          
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      • Vol. 35, Issue 11, Pages: 1183(2015)
        摘要：<正>近日,由广东省标准化研究院和深圳领威科技有限公司共同起草的广东省地方标准《压铸机能耗检测方法》和《压铸机能耗限定值及等级判定方法》获广东省质量技术监督局批准发布,并将于2015年12月7日起正式实施。两项标准统一了广东省压铸机的能耗检测方法,规定了压铸机的能耗等级限定值和等级评定方法,并要求产品出厂时对其能耗等级进行标注。其发布实施一是有效解决了广东省压铸机高耗能的迫切问题,满足我国节能降耗的发展需要;二是为压铸  
          
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      • Vol. 35, Issue 11, Pages: 1225(2015)
        摘要：<正>首款按照国际标准自主研制的喷气支线飞机通过适航审定、首个千万吨级炼油装置国产智能控制系统全线应用、煤炭深加工核心装备跻身世界先进行列……"十二五"时期,我国高端装备实现了一系列突破,正成为重构中国制造业竞争力的关键环节和核心内容。"高端装备以高新技术为引领,位于价值链高端,是产业链的核心环节,具有技术和市场的相对垄断性,决定着整个产业链的综合竞争力。"国家重大技术装备办公室主任李东表示,2014年,我国装备制造业主营业务收入为30.7万亿元,连续5年居世界  
          
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      • Vol. 35, Issue 11, Pages: 1229(2015)
        摘要：<正>在行业持续萎缩的大环境下,镁市成绩单难尽如人意至10月23日,纯度为99.9%镁锭出厂现金价陕西、内蒙古地区为12 25012 300元/吨,山西太原地区约为12 450元/吨,山西闻喜地区12 600元/吨。承兑价格在现金价格基础上加200元/吨。出口FOB价格2 0302 060美元/吨。由于市场需求持续疲软,供需失衡致市场人士对后市态度仍不乐观。导致价格一路走跌的原因,一方面是工厂  
          
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      • Zhang Jiyuan,Li Yuandong,Li Ming,Qiu Jin,Ma Ying
        Vol. 35, Issue 11, Pages: 1154-1158(2015) DOI: 10.15980/j.tzzz.2015.11.010
        摘要：The 2024 wrought aluminum alloy ingots prepared by self-inoculation method were remelted partially by the thermal simulator,and effects of remelting temperature on the microstructure of the remelted isothermal holding and without holding ingots were investigated.The results show that nondendrite microstructure can be observed in slurry prepared by self-inoculation method.There exist amounts of equiaxed dendrites and a little underdeveloped dendrites without holding,while primary particles are spherical and distributed homogeneously in the matrix without liquid wrapping with isothermal temperature increase.Mergence and Ostwald ripening are the main mechanism of primary phase and secondary phase in the ingots.Formation of remelting liquid phase is in form of thin film,then more liquid phase grows gradually into a small area,which provides conditions for secondary solidification in subsequent work.The mechanism of secondary phase is dependent on growth of primary phase or independent nucleation and spherical solid grains.The end of the eutectic reaction is mean to the completion of the solidification process.  
        关键词：Self-inoculation Method;2024Aluminum Alloy;Reheating;Solidification Microstructure   
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      • Ai Xingang,Zhang Shuhao,Cao Zhen,Li Shengli,Wang Guocheng,Liu Haixiao,Meng Fantong
        Vol. 35, Issue 11, Pages: 1158-1162(2015) DOI: 10.15980/j.tzzz.2015.11.011
        摘要：The insulating board and heating agent play a decisive role in the quality of ingot.On the basis of Anycasting software,a mathematical model for the solidification field of 3.1tingot was established to predict effects of thermal conductivity of insulation board,heating agent adding time and addition on the shrinkage porosity in 3.1tingot,meanwhile,production verification was carried out.The results show that with thermal conductivity of insulation board less than 0.17 W ·m-2·K-1,appearance of the shrinkage porosity can be inhibited well.The heating agent should be added in time after mold casting or even earlier,and heat agent addition can be controlled in 0.671.33 kg.  
        关键词：Steel Ingot;Numerical Simulation;Insulation Board;Heating Agent;Porosity Shrinkage   
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      • Cao Liu,Liao Dunming,Zhou Cong,Chen Tao,Pang Shengyong,Zhou Jianxin
        Vol. 35, Issue 11, Pages: 1163-1166(2015) DOI: 10.15980/j.tzzz.2015.11.012
        摘要：Based on the mathematical model of the transient heat conduction equation,ageneral method of treating multi-material boundary conditions was presented,and a temprature-field numerical simulative program for multiply materials based on finite element method（FEM）was developed.The temperature field of a typical I-shaped specimen during air cooling and a complex aluminium alloy casting during solidification process were calculated by the self-developed program,which was well agreement with the ones calculated by ANSYS and InteCAST.The maximum relative error of temperature field during air cooling is 2.130‰,and the maximum relative error during solidification is 2.064%,so the correctness and the reliability of the temperature program have been verified.  
        关键词：Temperature Field;Numerical Simulation;FEM;Treating Boundary   
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      • Li Xiulan,Zhou Xinjun,Xie Wenling,Ma Youping
        Vol. 35, Issue 11, Pages: 1167-1170(2015) DOI: 10.15980/j.tzzz.2015.11.013
        摘要：Stainless steel bar was inserted into high chromium cast iron liquid in order to change temperature field of solidification liquid steel.Temperature field of high chromium cast iron was simulated by the ANSYS software during the solidification process.The change and distribution characteristics of temperature fields were obtained to understand effects of temperature field change on solidification microstructure of high chromium cast iron.The results reveal that the initial temperature field change of iron liquid has important influence on solidification microstructure.The temperature field exhibits the great change at the boundary of high chromium cast iron liquid and stainless steel bar in initial solidification,so the desirable solidification microstructure in the zones can be observed.At the middle iron liquid zones between crucible wall and stainless steel bar,temperature field is changed smoothly during initial solidification,so the coarsest solidification microstructure can be observed.The simulation results have a satisfied predictive role in solidification microstructure characteristics of the casting.  
        关键词：Temperature Field Simulation;ANSYS Software;High Chromium Cast Iron;Solidification Mi-crostructure   
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      • Xia Wanghong,Liu Qiming,Ren Chuandong
        Vol. 35, Issue 11, Pages: 1171-1173(2015) DOI: 10.15980/j.tzzz.2015.11.014
        摘要：The casting process of squeezing casting suspension bracket was analyzed by the MagmaSoft,and the optimized processing parameters were presented.The simulation result shows that the un-even wall-thickness can cause the hot spot,and it is difficult to feed and sequential solidification at pressure because of far away ingate,which are responsible for the formation of shrinkage porosity（holes）in the suspension bracket.Through squeezing large-thick location,such as local squeezing feeding,forced cooling or adding chilling block to modify the solidification order of think-large location of the bracket,the shrinkage porosity（or holes）can be eliminated by realizing sequential solidification.Aiming at suspension bracket,through modifying ingate size,shrinkage porosity can be eliminated,which is verified by the practical production.  
        关键词：Squeeze Casting;MagmaSoft Software;Simulation Analysis;Sequential Solidification   
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        发布时间：2023-12-18
      • Ge Jilong,Zhao Haidong,Hu Qiyao,Gao Junmin,Wang Zhuoming
        Vol. 35, Issue 11, Pages: 1174-1177(2015) DOI: 10.15980/j.tzzz.2015.11.015
        摘要：The skin microstructure has a great influence on the performance of the die casting aluminum alloy parts.The characteristics of the skin microstructure of the die casting ADC12 alloy produced at different fast shot speeds was analyzed by means of metallography observation and numerical simulation.It is concluded that there exsits three characteristics of the skin microstructure in the castings:layer with richα-Al,normal microstructure of primaryα-Al and eutectic phase followed by layer with richα-Al,normal microstructure of primaryα-Al and eutectic phase.Effects of the fast shoting speed and distribution of mould cavities on the skin microstructure were analyzed.  
        关键词：High Pressure Die Casting;Skin Microstructure;Fast Shoting Speed   
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      • Fang Yuanming,Xu Jun,Gao Zhihua,Zhang Zhifeng
        Vol. 35, Issue 11, Pages: 1178-1180(2015) DOI: 10.15980/j.tzzz.2015.11.016
        摘要：Effects of pouring temperature on defects of 7075 alloy connecting rod parts were simulated by the MAGMAsoft and validated by die casting experiment.The results show that the probability of defects is decreased with decreasing in pouring temperature.Through observing microstructure of the 7075 connecting rod parts at different pouring temperatures,it shows that the grain size is decreased with the decrease of pouring temperature,and the dendrites are converted into the equiaxed grain.  
        关键词：7075Aluminum Alloy;MAGMASOFT;Pouring Temperature;Microstructure   
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      • Yang Cheng,Yang Xingguo,Tang Heyong,Yang Zhengping
        Vol. 35, Issue 11, Pages: 1181-1183(2015) DOI: 10.15980/j.tzzz.2015.11.017
        摘要：The motorcycle engine crankcase is common produced by die casting aluminum alloy,and gate slag easily occurs in the die casting aluminum alloy crankcase.The gate slag is classed into three kinds of types:shrinkage cavity,oil,chilled layer.The main reasons are attributed to a higher mold temperature,excessive lubricant and high impurities in molten aluminum alloy.Through decreasing mold temperature,shrinkage cavity can be eliminated effectively.Aiming at oil slag,some measures,such as adjusting punch lubricant volume,adding location and supplying ways,were taken into account.For eliminating chilled layer slag,some ways are effective including modifying shoting time,staying time and strictly controlling degassing in the liquid aluminum alloy.  
        关键词：Aluminum;Die-Casting;Gate Slag;Crankcase Housing   
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        发布时间：2023-12-18
      • Zhou Qian,Deng Weilin,Ji Xiaoyuan,Jiang Anlong,Zhou Jianxin,Shi Yueliang,Yang Tao
        Vol. 35, Issue 11, Pages: 1184-1187(2015) DOI: 10.15980/j.tzzz.2015.11.018
        摘要：Precision casting titanium has long production process,high technical difficulty,high frequency rework and long production cycle,which makes the management of each step of production process as well as the retrospection of the production progress more difficult.For an example,the existing problems of production management process of multi-item and small-batch foundry enterprise was analyzed.Combined with the ideas of agile manufacturing,lean production,single-piece model and product lifecycle management,a set of main-sub card solution of production processes was designed and proposed.This program is composed of main card and sub card,in which main card consists of the first main card and the second main card,while sub card consists of circulation sub card and repair-rework card.Finally,the design scheme was applied in the enterprise production management,so the problems of the mixed boiler,the mixed group and batch management in the production of the titanium casting enterprises were eliminated,realizing the real-time traceability of production progress,optimizing the production process management.  
        关键词：Titanium Alloy;Precision Casting;Production Processes Card;Production Management   
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        发布时间：2023-12-18
      • Dong Yunbo,Liu Longfei,Liu Jianping,Lü Shulin,Wu Shusen
        Vol. 35, Issue 11, Pages: 1188-1193(2015) DOI: 10.15980/j.tzzz.2015.11.019
        摘要：The oxidation behavior of a novel 22Co-29Cr-21Ni-2.2Nb-Fe Co-base superalloy with about22% Co（Co22for short）was analyzed at 1 050 ℃,1 150 ℃ and 1 250 ℃,and the oxidation products were observed by scanning electronic microscopy and X-ray diffraction,EDS.The thermogravimetric results reveal that oxidation kinetics of the alloy obeys parabolic law,and the oxidation rates are increased with the temperature increase.The oxidized layers formed on all specimens consist of Cr2O3,（Fe,Ni,Co,Cr）3O4spinels and CrNbO4 in internal layer and continuous Cr2O3 layer formed exactly on top of substrate as the inner layer.The mechanism of oxide layers formation is suggested to be divided into three-stage:firstly,Cr2O3 is formed as a continuous and protective layer,then Fe,Co,Ni,Nb ions diffuse to scale-gas interface to form nodules,finally,the nodules grow bigger and（Fe,Ni,Co,Cr）3O4-Cr2O3 double layer is formed.  
        关键词：Co-base Alloy;High Temperature Oxidation;Oxidation Kinetics;Growth Mechanism   
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        发布时间：2023-12-18
      • Shen Yuehua,Li Xiaoyun,Zhang Qidong,Huang Zhongyue
        Vol. 35, Issue 11, Pages: 1193-1195(2015) DOI: 10.15980/j.tzzz.2015.11.020
        摘要：Influences of molten temperature on the crystallization activation energy and thermal stability of Cu50Zr50 amorphous alloy were analyzed by fitting calculation measurements and annealing treatments.The results indicate that with the molten temperature increases,the thermal stability of Cu50Zr50 amorphous alloy is enhanced,and crystallization activation energy is increased.Meanwhile,the energy barrier for nucleation becomes the greater and the atomic mobility becomes the lower,resulting in the more difficult to the nucleation and crystallization.  
        关键词：Amorphous Alloy;Molten Temperature;Crystallization Activation Energy;Thermal Stability   
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        发布时间：2023-12-18
      • Hu Zhixiong,Yin Peng,Sun Xinmin,Yu Anshan,Dai Binyu
        Vol. 35, Issue 11, Pages: 1196-1199(2015) DOI: 10.15980/j.tzzz.2015.11.021
        摘要：Using Surface Evolver 2.7and Rhinoceros 5.0software,a 3D geometric model of ceramic foams was constructed based on the Weaire-Phelan model.A mathematical model of the ceramic foam centrifugal filtration for copper alloy melt was built up.Effects of centrifugal speed,the aperture and thickness of ceramic foam on filtration efficiency and pressure loss as well as outlet melt flow rate were simulated.The results show that the main factors affecting the filtration efficiency and pressure loss are the aperture and thickness of ceramic foam.The filtration efficiency and pressure loss are increased with the aperture decrease and the thickness of ceramic foam increase.The outlet melt flow rate is increased with the increase of aperture and centrifugal speed,and decreased with the increase of the ceramic foam thickness.  
        关键词：Copper Alloy Melts;Ceramic Foam;Centrifugal Field;Filtration;Numerical Simulation   
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        发布时间：2023-12-18
      • Zhai Peng,Xiao Bohan,Zhang Kun,He Kai,Wang Chunyang
        Vol. 35, Issue 11, Pages: 1199-1203(2015) DOI: 10.15980/j.tzzz.2015.11.022
        摘要：Degassing and grain refinement are main method to enhance the comprehensive mechanical properties of Al-Si alloy.Ultrasonic treatment can achieve both degassing and grain refinement due to the acoustic behavior.The power of the ultrasonic is the main factor influencing degassing and grain refinement.PZT actuators are globally utilized,whose low power is a restrictive factor.Giant magnetostrictive material has the higher power and better control characteristics,which can be a new approach to be applied on Al-Si alloy casting enhancement.  
        关键词：Al-Si Alloys;Ultrasonic Treatment;Grain Refinement;Dehydrogenization   
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        发布时间：2023-12-18
      • Zhu Zhenfeng
        Vol. 35, Issue 11, Pages: 1204-1205(2015) DOI: 10.15980/j.tzzz.2015.11.023
        摘要：Alcohol-based coating was developed with brown alumina powder as refractory aggregate,phenolic resin as composite binder,the lithium base bentonite as suspending agent.Through the process testing and practical production verification,the coating developed was suitable for large-scale production of high manganese steel.  
        关键词：EPC Process;High Manganese Steel;Alcohol-Based Coating   
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        发布时间：2023-12-18
      • Yang Zhenkai,Wang Haijun,Liu Ming,Wang Jingchen
        Vol. 35, Issue 11, Pages: 1205-1208(2015) DOI: 10.15980/j.tzzz.2015.11.024
        摘要：The Cr2O3-16TiO2 coating was fabricated by high efficiency plasma spraying technology.The properties,such as micro-hardness,microstructure,were measured.Results show that the Cr2O3-16TiO2 coating is deposited with high density,and the micro-hardness of the coating reaches 1 440HV0.3and the porosity is about 1.6%,measured by image analysis（IMA）method.The SEM results show that the coating is composed of Cr2O3 and mainly TiO2 analysis by EDS and XRD.Under the condition of oil lubrication,the friction coefficient of the coating is increased with the increase of the loading,and the main wear mode is characterized by contact fatigue with apparent surface scratches.  
        关键词：Supersonic Plasma;Cr2O3-16TiO2Coating;Micro-Hardness;EDS;Friction Wear   
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        发布时间：2023-12-18
      • Wang Rong,Ma Haibo,Wei Deqiang
        Vol. 35, Issue 11, Pages: 1209-1212(2015) DOI: 10.15980/j.tzzz.2015.11.025
        摘要：Ni-30 SiC composite powder was prepared by mechanical alloying.The microstructure and morphology of Ni-SiC composite powder after ball-milling were analyzed by SEM and EDS to understand role of Ni in cladding SiC particle and the uniformly mixed degree of two kinds of powder.The results reveal that with increasing ball milling time,the cladding effects of Ni in SiC particles are enhanced increasingly with more uniform mixture of two powders.There exists a optimized ball-milling time,and the cladding effects can be weakened when ball-milling time is more than the optimized value.In addition,the excessive rotating velocity can promote the working hardening of cladding layer to fall off,resulting in the worse cladding effects.With milling time of 20 h,milling speed of 300r/min and ball to powder ratio of 10∶1,SiC powder particles are coated well by Ni with uniform mixture of the two kinds of powder.  
        关键词：Mechanical Alloying;Coating Effect;Uniform Mixture   
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        发布时间：2023-12-18
      • Hu Qiyao,Zhao Haidong,Ge Jilong
        Vol. 35, Issue 11, Pages: 1213-1216(2015) DOI: 10.15980/j.tzzz.2015.11.026
        摘要：B4C/A356 and SiCp/A356 composites were prepared by compocasting method,and microstructure and mechanical properties of two composites prepared were investigated by SEM,OM and hardness testing,tensile testing.The results indicate that SiCp/A356 composites with uniformly distributed reinforcements SiCpcan be fabricated successfully at a lower solid fraction（about 26%）,while at a higher value（about 27%）of solid fraction,B4C/A356 composites can be prepared.Additionally,B4 C particles can react with molten Al during the preparation and lots of reaction products can be observed,however,reaction of SiCp with molten aluminum alloy is absent,and the levels of reaction products can be controlled by adding 1.2% Ti.Further more,SiCp/A356 composites have a better tensile properties due to generate a strong bonding interface.  
        关键词：PAMCs;Compocasting Method;Solid Fraction;Particle Distribution;Interfacial Reaction   
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        发布时间：2023-12-18
      • Zhao Qian,Yuan Xiaoguang,Huang Hongjun,Zhao Peng
        Vol. 35, Issue 11, Pages: 1217-1220(2015) DOI: 10.15980/j.tzzz.2015.11.027
        摘要：Microstructure and properties of T6 treated Al-Mg-Si-Zr-xEr alloy sheets were investigated by tensile testing,transmission electron microscope（TEM）,X-ray diffraction（XRD）,scanning electron microscope（SEM）,energy dispersive spectrum（EDS）and optical microscope（OM）.Effects of Er element on microstructure and properties of alloy sheets were analyzed.The results show that with the Er content increases,the grain size is refined gradually,and the solute atom is precipitated more fully,so the tensile strength and hardness are improved.The granular and near-granular second phases mainly existing in Al-Mg-Si-Zr-xEr alloy sheets are composed of Mg2 Si,Q-Al1.9CuMg4.1Si3.3, CuAl2,Al4Mn3Si2,Al3 Er,Al3Zr,Al3（Er,Zr）.The addition of element Er can promote the precipitation ofβ″phase.The fine and uniformβ″phase in the Al-Mg-Si-Zr-0.3Er alloy is precipitate dispersively after the solution treatment at 540 ℃for 1hand aging at 180 ℃for 5h.  
        关键词：Al-Mg-Si Alloy;Element Er;Heat Treatment;Microstructure;Properties   
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        发布时间：2023-12-18
      • Zhao Li,Fang Xiaogang,LüShulin,Wang Jing,Wu Shusen
        Vol. 35, Issue 11, Pages: 1221-1225(2015) DOI: 10.15980/j.tzzz.2015.11.028
        摘要：The semisolid slurry of Mg-6Zn-3RE-1.4Yalloy was prepared by high-energy ultrasonic vibration.Then the slurry was used to be rheo-squeezed casting.Effects of rheo-squeeze pressure on microstructure and mechanical properties of Mg-6Zn-3RE-1.4Yalloy were analyzed.The results show that with the squeeze pressure increased from 0 MPa to 200 MPa,microstructure and mechanical properties of the alloy are improved significantly.The grain shape coefficient of the alloy at 200 MPa reaches 0.611,which increased by 33.1% compared with that at 0 MPa,meanwhile,the average diameter of the grains at 200 MPa is 39μm,which is reduced by 35% compared with that at 0 MPa.The tensile strength and elongation of the alloy reach 181 MPa and 8.2% at 200 MPa,increased by 20.5% and 86.4%,respectively,compared with those at 0 MPa.Fracture morphology analysis reveals that the alloy fracture mode is changed from cleavage fracture at 0 MPa into mixed fracture of cleavage fracture and dimple fracture at 200 MPa.  
        关键词：Magnesium Alloy;Rheoforming;Squeeze Pressure;Microstructure;Mechanical Property   
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      • Zhang Sen,Zhou Quan,Zhang Hao
        Vol. 35, Issue 11, Pages: 1226-1229(2015) DOI: 10.15980/j.tzzz.2015.11.029
        摘要：Influences of Zr（01.2%）on solidification structure and mechanical properties of Mg97Y2Cu1 alloy reinforced by long period ordered structure were investigated.The results show that primary grains in the alloy can be refined greatly by Zr addition.Distribution of second phase becomes more uniform with volume fraction increase.A little of granular CuZr2 phase can be generated in the alloy after Zr addition,which distributes inα-Mg matrix.Mechanical properties of the alloy are increased gradually with the increase of Zr addition.With the addition of 1.2% Zr,the tensile strength and elongation of the alloy reach 218 MPa and 9.4%,which are increased by up to 26%and 62%,respectively,compared with those of the alloy without Zr addition.  
        关键词：Long Period Ordered Structure;Zr;Solidified Structure;Mechanical Properties;Mg Alloy   
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      • Shang Xinfeng
        Vol. 35, Issue 11, Pages: 1230-1232(2015) DOI: 10.15980/j.tzzz.2015.11.030
        摘要：The Cu-50 Mo contact material was prepared by spark plasma sintering（SPS）at 950 ℃ and 45 MPa for 20 min.Microstructure and properties of the material were investigated,and the hardness,conductivity and density of the alloy reach up to 110 HV,21.5MS/m,92.5%,respectively.Furthermore,effects of 1% WC addition on the structure and properties of Cu-50 Mo alloy material were analyzed.The results indicate that structure and wear resistance of the Cu-50 Mo material were improved.  
        关键词：Cu-50Mo Alloy;SPS;Structure and Properties;Wear Resistance   
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      • Vol. 35, Issue 11, Pages: 1233(2015)
        摘要：<正>20151101 ANDRADE A R,BOLFARINI C,FERREIRA L A M,et al.Nb对离心铸造镍基高温合金高温力学性能的影响.Materials Science and Engineering,2015,A628:176-180.镍基高温合金如Fe-25Cr-35Ni-0.4C已在石化炼油炉等领域获得广泛应用,但关于Ni含量对该类合金高温力学性能的影响还缺乏系统研究。基于此,研究了添加Nb对离心铸造镍基高温合金高温力学性能的影响。首先采用离心铸造工艺制备了  
          
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      • Vol. 35, Issue 11, Pages: 1234(2015)
        摘要：<正>20151101一种模块式热芯盒,CN203917808U,2014.11.05,宜昌奥力铸造有限责任公司.一种模块式热芯盒,包括与壳芯机连接的芯盒底座,芯盒底座上设有加热元件,静芯盒与壳芯机固定连接,动芯盒与壳芯机滑动连接,静芯盒与动芯盒之间设有定位销,导向杆的一端与芯盒底座固定连接,导向杆的另一端与回位板滑动连接;还设有可拆卸的与不同产品规格相对应的模型镶块;模型镶块  
          
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