最新刊期
卷 38 ， 期 11 ， 2018
- 摘要：<正>时间:2019年8月地点:河南洛阳1.会议主办单位中国机械工程学会铸造分会特种铸造及有色合金技术委员会复合材料技术委员会《特种铸造及有色合金》杂志社2.会议时间2019年8月3.会议地点河南洛阳4.征文内容（1）铸造有色合金（包括铝、镁、钛等轻有色合金,铜、锌等重有色合金,中间合金,高温合金及特种合金）、复合材料（包括铝、镁、钛、铜、锌、钢等基体）的研究与应用;（2）铸造有色合金的熔
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发布时间：2023-12-18 - 摘要：A Mg-Zn-Y alloy with the addition of low-cost RE（Ce,La）mischmetal was designed.Effects of RE（Ce,La）mischmetal level on microstructure evolution and mechanical properties of Mg-Zn-Y alloy at room and elevated temperature were investigated by OM,SEM,XRD and tensile testing.After adding the RE（Ce,La）mischmetal into ZW61（Mg-6Zn-1.4Y）alloy,the microstructure is refined obviously and a kind of new phase with high melting point named as T phase[（Ce,La）(Mg1-xZnx)11]is precipitated from the alloy.The precipitation of the Tphase can decrease the value of Zn/Y in the residual melt and then the phase transformation can be changed.Meanwhile,the T phase presents the satisfied thermal stability which is beneficial to improving alloys’mechanical properties at elevated temperature.However,excessive T phase precipitation can lead to stress concentration and lower tensile strength at room temperature.With 1% RE（Ce,La）addition,high mechanical properties can be observed for the alloy at room temperature.In addition,the tensile strength of the alloy at elevated temperature is increased with the increased of RE（Ce,La）content.关键词：(Ce,La)MischMetal;Mg-Zn-Y Alloy;T Phase;Elevated Temperature Mechanical Properties
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发布时间：2023-12-18 - 摘要：The alloy slurry was prepared by ultrasound vibration thermal equilibrium method,direct thermal equilibrium method and traditional casting process.Then die-casting forming was conducted at the same pouring temperature,mold temperature,injection pressure and injection speed.The heart part and edge part of die castings were sampled,and the microstructure was observed.The same part of die castings was sampled for tension test.The effects of different process conditions on microstructure and mechanical properties of die castings were analyzed comparatively.The results show that the microstructure of die castings obtained by ultrasound vibration thermal equilibrium method semi-solid process presents the most tiny,round and uniform structure with the satisfied mechanical properties,and then that by direct thermal equilibrium method.After T6 treatment,the comprehensive mechanical properties of die castings are improved significantly.关键词：Ultrasound Vibration;Thermal Equilibrium Method;A356Aluminum Alloy;Semi-solid;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：<正>奥迪公司成为第一家获得ASI绩效标准认证的铝下游用户,也是第一家获得ASI认证的汽车制造商。其在德国Neckarsulm、匈牙利和比利时布鲁塞尔的三个厂均为奥迪e-tron电动车制造和组装大容量电池,这三个工厂的铝制部件材料管理通过了ASI绩效标准认证。从可持续发展的角度来看,电池技术是快速发展的电动汽车市场的关键技术:其性能决定了汽车的行驶距离并可稳定地被重复使用,直到其使用寿命结束后再被回收利用。下一步,奥迪将确保这些零部件和供应链的可持续性。为
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发布时间：2023-12-18 - 摘要：The effects of different Ni content on microstructure and Ohmic contact properties of Au-12Ge alloy were investiagted.The results reveal that the segregation of the alloy is enhanced,and the minimum contact resistance is decreased firstly and then increased,so the thermal stability of the corresponding ohmic contact shows a tendency of getting better first and then deteriorating with the increase of Ni content.The desirable specific contact resistivity of 5.04×10-6Ω·cm2 of Au-12Ge-3Ni/Au with annealing at 425℃ for 1 min can be obtained,and the corresponding Au-12Ge-3Ni/Au system presents the best stability.关键词：Au-12Ge Alloy;Ni Content;Ohmic Contact;Specific Contact Resistivity
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发布时间：2023-12-18 - 摘要：The isothermal compression process of TA15 titanium alloy was simulated at 750 ℃,800 ℃,850 ℃,950℃and strain rate of 0.001～10 s-1.The simulation results show that the TA15 titanium alloy presents deformation localization during compression deformation process.The local damage values are decreased with the deformation temperature increase and the strain rate decrease,and the damage extreme value appears mainly in the free deformation zone of the specimen.The microstructure of the experimental specimens was observed in the free deformation zone of the specimens.The microcracks,micro-voids and local flow bands can be observed in the microstructures of the specimens.The damage degree is decreased with the deformation temperature increase and the strain rate decrease.关键词：TA15Titanium Alloy;Numerical Simulation;Deformation Localization;Damage
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发布时间：2023-12-18 - 摘要：During the process of mixing and molding,the bonding strength of sodium silicate sand is reduced due to the loss of surface water.In severe conditions,it is failure for mold making,resulting in waste of molding sand.The water glass was modified with glycerin,and the quality guarantee period（-interval time from sodium silicate sand is mixed to be able to make qualified mould）of the molding sand prepared with glycerin modified water glass and unmodified water glass was measured,and effects of glycerin on the strength,hygroscopicity and residual strength at 800 ℃ were analyzed.The results reveal that the bench life working time of molding sand made from water glass with 3% glycerin is 2 times that of unmodified ones.In the range of glycerin content 0%～3% in water glass,the tensile strength of water glass bonded sand can be increased by 7% per 1% glycerin,and the binder content of water glass bonded sand can be reduced,however the change of residual tensile strength of the molding sand can be neglected.With glycerin modified water glass,the hygroscopicity of water glass bonded sand is not changed obviously.The results show that the most prominent effect of glycerin on the modification of water glass is that it can prolong effectively the bench life working time of water glass bonded sand.关键词：Glycerin;Modifier;Water Glass Bonded Sand;Quality Guarantee Period
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发布时间：2023-12-18 - 摘要：The hot deformation behavior of PH13-8Mo stainless steel was investigated by Gleeble thermal simulation machine at deformation temperature in range of 900 ℃ to 1 150 ℃ and strain rate in range of 0.1 s-1 to 10 s-1.The results show that with strain increase,the flow stress is increased dramatically to a peak value,and then it is decreased continuously（900～1 050 ℃）or tended a steady value（1 100℃and 1 150℃）.The flow stress is decreased with the increase of deformation temperature and the decrease of strain rate.Based on the Arrhenius equation,the hot deformation constitutive relationship of the peak flow stress was established,and the hot deformation activation energy Qis calculated as 567.32 kJ/mol.The error analysis shows that the relative error between calculated value and experimental value is lower than 1.3%,presenting the higher precision.Microstructure analysis indicates that increasing deformation temperature and decreasing strain rate are beneficial for dynamic recrystallization,while its grain size is easier to be coarsened.关键词：PH13-8Mo Stainless Steel;Hot Deformation Behavior;Constitutive Relationship
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发布时间：2023-12-18 - 摘要：A single isothermal constant strain rate compression test was carried out for 6061 aluminum alloy by the Gleeble-3500 simulator to understand the dynamic recrystallization behavior of the alloy under thermal deformation conditions at 0.001～1 s-1 and 350～500 ℃.The peak stress data of the rheological stress curve obtained from the statistical test determines that the thermal deformation activation energy of the alloy is Q=307.528 kJ·mol-1,and the rheological stress equation,dynamic recrystallization peak and critical strain model under different thermal deformation conditions are established.The dynamic volume fraction of the alloy was calculated under different deformation conditions according to the rheological stress curve,and the dynamic model of dynamic recrystallization was established.Analysis of rheological stress curve shows that with deformation of 6061 aluminum alloy at 350～500℃,the strain rate is decreased,so the structure of the 6061 alloy is more easily to undergo dynamic crystallization,and the stress softening phenomenon is more obvious.关键词：6061 Aluminum Alloy;Rheogical Stress;Critical Strain;Dynamic Recrystallization
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发布时间：2023-12-18 - 摘要：The 06Cr19Ni10 stainless steel with different nitrogen and nickel content was smelted using vacuum induction furnace（ZG-0.01）to understand effects of increasing nitrogen and reducing nickel on microstructure and mechanical properties.The results show that microstructure of the test steel with nitrogen content of 0～0.28% and nickel content of 5.98%～9.63% keeps still the single austenitic,and the grain size is decreased with the nitrogen content increase,while the impact toughness of the test steel is deteriorated,where the room temperature impact absorption energy is reduced from 267 Jat the nitrogen content of 0 to 228 Jat the nitrogen content of 0.28%.Rockwell hardness,tensile strength and yield strength of the test steel are increased with the increase of nitrogen content.When the nitrogen content is 0.28%,the desirable mechanical properties of 06Cr19Ni10 steel are presented,where the Rockwell hardness,tensile strength,yield strength and elongation after fracture reach 95.4 HRB,814 MPa,437 MPa,52.5%,respectively.关键词：Nitrogen Steel;Economical Stainless Steel;Solution Treatment;Fracture Morphology
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发布时间：2023-12-18 - 摘要：The effects of varied feed speed on the microstructure and properties of AZ31B magnesium alloy/5052 aluminum alloy interface alloyed friction stir welding joints with Cu foil were investigated.The results reveal that the tensile strength of the joint presents the lowest value with the feed speed of 200mm/min,and it is satisfied with 100mm/min and 300mm/min.As the thickness of the added copper foil increase,the tensile strength of welded joint is increased firstly and then decreased.With the feeding speed of 100mm/min,the 0.05mm thickness of copper foil and the rotation speed of 1 200r/min,the desirable welding joints can be obtained,and the maximum tensile strength can reach 87.5 MPa.With the copper foil,Mg2Al3,Mg17Al12,AlCu,Al2Cu and MgCu2 phases are generated at the joint junction without obvious welding defects,and hardness distribution shows approximately’M’shape.关键词：Frictional Stir Welding;Feed Speed;Magnesium Alloy;Aluminum Alloy
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发布时间：2023-12-18 - 摘要：<正>近日,国际工业机器人ABB集团宣布,将在上海投资1.5亿美元（约合10亿元人民币,1美元=6.942 5人民币--本刊注）新建一座全球先进、柔性化的机器人工厂,实现用机器人制造机器人。同时,ABB集团与上海市政府签署战略合作谅解备忘录。据了解,ABB新工厂位于上海康桥,占地面积约6万平方米,紧邻ABB现有的大型机器人工业园区,利用包括ABB Ability解决方案在内的互联数字化技术、一流的协作机器人技术以及创新的人工智能研究。建成后,年产量预
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发布时间：2023-12-18 - 摘要：<正>如何在镁合金表面制备出兼顾腐蚀防护、高强韧性的牢固的保护膜层,是困扰镁合金行业的关键技术瓶颈。近日,西安交通大学微纳米尺度材料行为研究中心和陕西省镁基新材料工程研究中心成功地在微纳尺度镁合金表面制备出致密、强韧和牢固的纳米级保护层,为研制新型高强韧耐蚀镁合金提供了全新的技术思路。"腐蚀防护是镁合金行业的核心课题之一。尽管现有技术可以制备出抗蚀性良好的防护膜层,但这类膜层往往比较脆,容易
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发布时间：2023-12-18 - 摘要：<正>近日,澳柯玛第1台6轴工业机器人在中德生态园澳西智能科技有限公司研制成功,这是澳柯玛-西门子机器人应用联合实验室继2017年12月推出消防机器人后,研制的另一款主打产品"6轴工业机器人"。据了解,该款机器人采用全套西门子电控系统,能够实现各行业的自动化装配、上下料、物料搬运、包装、码垛等多项高难度、高量度、高精度的产线工序工作要求。
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发布时间：2023-12-18 - 摘要：<正>近日,东风技术中心材料工艺部王泽忠等在宁波某压铸厂参加"高性能镁/铝合金高品质铸件制备技术项目"中的镁合金减震塔第一次试模。上海交通大学的彭立明等和凤阳爱尔思公司的相关技术骨干也一同参加试模。通过不断努力,镁合金减震塔的充型试模最终顺利完成。本次减震塔压铸模采用三板模设计,利用模温机控制模具的温度,通过定量泵抽取固定的镁合金熔液进入料管,
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发布时间：2023-12-18 - 摘要：Magnesium-lithium alloy is the lightest metal structural material,which exhibits promising potential in weight reduction of aircrafts.However,the phenomenon of aging softening observed strongly retards its further application.The mechanisms of age-softening were reviewed,including the growth,segregation and coarsening of matrix precipitates and the transformation from metastable phases to equilibrium phases with prolonged aging time.Then,several effective methods were expounded which could inhibit the age-softening.Finally,prospect for the investigations on aging behavior of Mg-Li alloy was described.关键词：Mg-Li Alloy;Aging Softening;Alloying;Heat Treatment;Plastic Deformation
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发布时间：2023-12-18 - 摘要：Ttitanium and titanium alloy have the features of low surface hardness,high friction coefficient,poor wear resistance and high temperature oxidation resistance as well as poor corrosion resistance.Its surface is widely treated by laser cladding technology.The packing way of laser cladding and coating type of cladding material were reviewed,and some suggestions for the relative process were put forward.关键词：Laser Cladding;Titanium Alloy;Surface Treatment
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发布时间：2023-12-18 - 摘要：Synchrotron radiation X-ray computed tomography technology was adopted to reconstruct the three-dimensional microstructure of AA6601 billet with different reheating temperature.Three-dimensional internal defects were analyzed quantitatively to investigate influence of reheating temperature on internal defects evolution.The results reveal that with the increase of reheating temperature,the shrinkage cavity can be compensated by the liquid phase,leading to the decrease of shrinkage percentage and the rise of the gas pore as well as the decline of the internal defects ratio,which are beneficial for the semi-solid forming.However,the iron-rich phase can prevent liquid phase from compensating the shrinkage cavity,which is not conducive to eliminating the internal defects.关键词：Semi-solid AA6061;Reheating;CT Scanning;3D-XRD;3D Microstructure Reconstruction
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发布时间：2023-12-18 - 摘要：The particle swarm optimization（PSO）combined with BP neural network was used for the forecast and control of thickness transverse distribution of hot rolled strip.According to theoretical analysis,the basic conditions and parameters of forecasting model were established.And based on the reduction and plate width,the measured data and simulated one of thickness transverse distribution of AZ91D hot rolling strip were analyzed comparatively.The model presents the optimized effects with strip width in 100～500 mm and reduction of 30μm.The average error of thickness is less than 4.2μm.Finally,the neural network was used for thickness control system of the hot rolling strip.
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发布时间：2023-12-18 - 摘要：Commercial software Deform-3D was used to simulate the deformation process of ZK60 magnesium alloy on equal channel angle extrusion（ECAP）and secondary extrusion.In order to understand the influence of secondary extrusion and ECAP on grain refinement,the variation of billet flow and deformation uniformity,extrusion load and effective strain during ECAP and secondary extrusion were discussed.The simulated results show that with the temperature at 275～300℃for ECAP and secondary extrusion at 150℃,the billet can obtain a large distribution of uniform strain,further obtaining an ultrafine magnesium alloy with good performance.The results of the grain refinement obtained in the experiment are agreement well with the simulation ones.关键词：ECAP;Finite Element Simulation;Secondary Extrusion;Effective Strain;Extrusion Load
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发布时间：2023-12-18 - 摘要：The rapid failure of the injection plunger from a DM3500 die casting machine has been analyzed which was resulted from insufficient stiffness of injection mechanism.Variable density topology based on SIMP has been applied to optimize the stationary platen in the injection mechanism.At first the mechanical model has been set up to calculate strength and stiffness of the injection mechanism using FEM under different working conditions.Secondly the optimization model has been built to optimize topology.The final optimization of the stationary platen has been proposed according to the unit density contour from the calculation.The comparison between optimization and original design shows that the stiffness of injection mechanism is improved by 35.6%,which can reduce the rapid failure of the plunger significantly.In addition,the weight reduction is also achieved by 3.4%.关键词：Stationary Platen;Injection Plunger;Failure;Topology Optimization;Lightweight
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发布时间：2023-12-18 - 摘要：Aiming at two difficulties in designing die for engine chain cover such as shrinkage porosities easily generated in the cover as a result of forming difficulty in top pouring and warping deformation during machining large plane,numerical simulation was carried out by the Magma to determine rational gating system and present the hot spot position,deformed mode and parameters.Additionally,according to analysis,various ways including employment of hole position to increase squeeze pins,optimization of the arrangement of die thimble and water cooling,and balance of die wraping force,were applied to realize development of die casting die.The results demonstrate that the qualified rate of die casting engine cover reach up to above 96%,and the flatness of processing on lager plane can be controlled within 0.8 mm,decreasing the cost of die development.关键词：Die-casting Die;Numerical Simulation;Gating System;Squeezing Pin
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发布时间：2023-12-18 - 摘要：The casting simulation technology was used to analyze the filling process,which can reduce greatly the cost and shorten the trial production cycle.Based on the analysis,the ProCAST software was used to simulate the investment casting process of the thin-wall blade.Based on the analysis of the simulated defects,the casting process optimization was carried out from two aspects of the structure of the gating system and the casting process parameters,obtaining the qualified castings.关键词：Investment Cast;ProCAST;Hollow Blade;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Using scanning electrical microscope（SEM）,X-ray diffraction（XRD）and energy dispersive spectrometer（EDS）,the effects of annealing temperatures on the microstructure of Cu-Al clad plate produced by roll-casting technology were investigated.And the mechanical properties of the composite plate were characterized by tensile tests and micro-hardness tests.The results show that the thickness of interface layer is increased from 1μm to 11μm with the increase of annealing temperature and the interface layer includes three sub-layers at 400℃.The diffusion of atoms and the kinds of phases at interface are increased as the annealing temperature increase.The CuAl2 phase at the interface is firstly formed at 250℃,followed by Cu9Al4 at 300℃,then CuAl phase is formed at 450℃.The peeling strength of the interface is increased firstly and then decreased due to the change of phases and their thickness,and reaches a maximum value of 42N·mm-1 at 300℃.According to experimental results,the optimal annealing temperature for Cu/Al clad plates produced by roll-casting is 300℃.关键词：Roll-casting;Cu-Al Clad Plates;Interface;Intermetallic Compound;Mechanical Properties
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发布时间：2023-12-18 - 摘要：In order to improve the properties of silicon based ceramic core,the Al2O3 fibers with different content were added to the core slurry,and the core was made by hot pressure casting.The change of the bending strength and porosity of the core with different Al2O3 fibers was analyzed,and the microstructure of the sample was observed.The results show that the effect of Al2O3 fiber on the flexural strength and porosity of the ceramic core is significant.With the fiber content of 1%,the core flexural strength reaches the maximum value of 20.48 MPa,and with the fiber content of 0.75%,the porosity of the core is 36.16%.However,with the fiber addition more than 1%,the fiber presents poor dispersion,and the fiber bridging action is weak,so the enhancement effect is weakened.Al2O3 fiber reinforced ceramic core includes two mechanisms,bridging enhancement and pull-out enhancement.关键词：Silicon-Based Ceramic Core;Al2O3 Fiber;Flexural Strength;Porosity
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发布时间：2023-12-18 - 摘要：Al matrix composites with different composition were prepared by powder metallurgy.After mechanical mixing,the powder was formed by cold pressing at a certain pressure,then sintered at 550℃ in argon atmosphere and holding for 30 minutes and then cooling with the furnace.It is found that the porosity of Al-Mg composites is higher,and the Al matrix and Ti particles in Al-Ti composites are physically combined,and the compactness of the Al-Mg-Ti composites is superior to that of the Al-Mg composites.In addition,a ternary phase Al18Ti2Mg3 can be observed.The presence of Mg can reduce the phase transition temperature of Al-Ti system,and the increase of Mg element is conducive to the further occurrence of Al-Ti reaction and finally the generation of ternary phase.关键词：Powder Metallurgy;Al Matrix Composites;Microstructure
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发布时间：2023-12-18 - 摘要：Aiming at requirements of high processing conditions,the thickness of the extruded tube wall only about 0.2 mm as well as absence of damage and inclusion in the wall with smooth for the 1100 aluminum alloy for automobile condensing pipe,the key control points in process of melt treatment,casting and rolling were explored.The results indicate that by adopting the optimizing parameters,the hydrogen content of molten aluminum is less than 0.13 mL/100 g,and microstructure of the alloy presents small equiaxed crystal.The final product is verified by user’s application that its processing performance exhibits the satisfied effects,meeting requirements.关键词：Aluminum Rod;Automobile Condensing Tube;Continuous Casting and Continuous Rolling
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发布时间：2023-12-18 - 摘要：Effects of Gd on the microstructure,phase structure,mechanical properties and fracture morphology of Al-5Mg-2Si-Mn alloy were analyzed.The results reveal that the Gd element presents a strong modification and refinement effect on the primaryα-Al phase and eutectic Mg2Si phase,and the effect of modification and refinement is desirable when Gd content is 0.4%.The distance between secondary dendrites are decreased from 28.23μm un-modified ones to 12.96μm,and eutectic Mg2Si size is decreased from 9.38μm to 5.07μm.The tensile strength,elongation and hardness of the alloy treated by 0.4% Gd are increased from 235MPa,3.9%and 33.21HRB to 328MPa,6.0% and 43.33HRB,respectively,and the fracture mode is changed from brittleness to dimple structure.关键词：Al-5Mg-2Si-Mn Alloy;Gd;Refinement;Modification;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The microstructure and mechanical properties of large strain rolled 2524 aluminum alloy sheet were investigated by means of optical microscope（OM）,differential thermal analysis（DSC）,X-ray diffraction（XRD）,tensile testing machine.The results reveal that the microstructure of the rolled 2524 aluminum alloy presents fibrous with a large amount of Al2Cu and Al2CuMg phases.With solid solution treated at 455 ℃ to 495 ℃,the higher solid solution treatment temperature and the longer treatment time are,the more second phase dissolved.After solution treated at 495℃for 60 min,the precipitated phase is basically dissolved,where the tensile strength,yield strength and elongation of 2524 aluminum alloy reach up to 412.6 MPa,350.7 MPa and 17.9%,respectively.After solid solution treated at 505℃,over-burning structure appears and thus the mechanical properties are weakened.After aging treatment,the strengthening phase is uniformly precipitated and the alloy is strengthened.The tensile strength,yield strength and elongation of the 2524 aluminum alloy after aging at 190 ℃ for 6 hare 464.6 MPa,395 MPa and 22%,respectively.关键词：2524Aluminum Alloy;Solid Solution;Aging;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Aiming at the pinholes in aluminum foil products caused by phase FeAl3,chemical components were changed and some contrast experiments were carried out with aluminum foil 1235 with different silicon contents.The effects of silicon content on the type,size,morphology and distribution of the second phase were analyzed by optical microscope and scanning electron microscope.The results show that the increase of silicon content in Al 1235 foil is beneficial for generating the phase αc-AlFeSi.The phase αc-AlFeSi can even replace a kind of acicular FeAl3,which are helpful for decreasing the pinholes in the foil.Simultaneously,the grains are refined with more uniform of grain size.Tensile strength and elongation of 1235 aluminum foil with silicon content between 13% and 15% are increased by 12.14% and78.57%compared to those ones with low silicon content,which is beneficial for further cold rolling.关键词：Aluminum Foil;Si Content;Second-Phase;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The ZL108 aluminum alloy with fine grain structure was prepared by friction stir processing（FSP）technology,and its microstructure,mechanical properties and damping capacity were investigated.The results reveal that after the FSPed,the coarse Si phase in the ZL108 aluminum alloy is significantly refined with more uniform distribution,and tensile strength and elongation of the ZL108 aluminum alloy are increased with the increase of the FSP rotation speed.In addition,the internal friction value of ZL108 aluminum alloy is increased with the increase of temperature.When the temperature is higher than 200℃,there exists a lot of fine grain boundary and phase boundary slip movement in the FSP sample,and the external vibration energy is converted into internal energy,which is beneficial to improving the high temperature damping behavior performance of the alloy.The damping behavior of the FSPed sample is significantly higher than that of the base metal,and the FSP sample with the rotation speed of 300 r/min has the highest damping behavior.The storage modulus of the ZL108 alloy is decreased as the temperature increase,and the storage modulus of the FSPed sample is higher than that of the base metal.关键词：Friction Stir Processing;ZL108 Alloy;Microstructure;Damping Behavior;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effective control of the rolling process parameters include tempterature,reduction ratio,roller rotation speed and roller diameter is important for controlling crocodile mouth phenomenon in the hot rolling cogging process.The Deform-3D software was used to simulate the alligator phenomenon during the 5052 Aluminum hot rolling and cogging process.Through the combination with the point track and orthogonal experiment method,the primary factors influencing the alligator phenomenon were obtained.The experimental results reveal that the main factor affecting alligator phenomenon is the reduction ratio,followed by the roller diameter and rolling temperature,and then the roller rotation speed.In the single pass rolling-simulation process,alligator length is controlled shortest when roller diameter is 450 mm,and the reduction ratio（e）is 20%,rolling tempter is 540℃ as well as roller rotation speed of 5 r/min.关键词：5052 Aluminum Alloy;Hot Rolling Cogging;Alligator;Numerical Simulation
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发布时间：2023-12-18 - 摘要：It was introduced briefly the classification of standard samples detection spectrometer.With the large number of applications of A356 aluminum alloy in industry,and the popularization of the photoelectric direct reading spectrometer,it was a large demand for type standard samples in verifying the accuracy of spectrometer.In order to reduce production costs,the production process of independently developed A356 type standard samples for spectrometer was described.Finally,through statistical calculation,it were verified the self-made type standard samples with homogeneity and stability.关键词：A356Aluminum Alloy;Spectrometer;Type Standard Samples;Homogeneity;Stability
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发布时间：2023-12-18 - 摘要：CuCrZr alloys were prepared by alloy addition method,directly melting and cladding addition method,and spiral springs were produced based on the same heat treatment and subsequent processing.In addition,the properties of the spiral spring produced were tested.The results show that the alloy prepared by the alloying addition has good tensile strength and elasticity modulus,which is about 493 MPa and 180 GPa,respectively,and its compressive resistance exhibits desirable,where the helix angle is 60 degrees,and difference of short axis is the smallest before and after the test,showing the satisfied electrical conductivity performance.关键词：Copper Chromium Zirconium;Helical Spring;Mechanical Properties;Electrical Conductivity
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发布时间：2023-12-18 - 摘要：Cu-20Pb hypomonotectic alloys were prepared under normal and undercooling conditions,and the structure and phase composition,microhardness as well as anti-friction properties of the Cu-20Pb hypomonotectic alloys were analyzed.The results show that Cu-20Pb hypomonotectic alloys under normal conditions are mainly composed ofα-Cu andβ-Pb with less uniformity,while under undercooling conditions,the segregation in hypomonotectic alloys is inhibited and grains are refined with compound dendrite.The friction wear testing indicates that Cu-20Pb hypomonotectic alloys prepared at undercooling condition presents the lower friction coefficient and wear rate with the betetr wear resistance.Microhardness testing shows that the hardness of Cu-20Pb hypomonotectic alloy is increased to 57.02GPa undercooling condition,increased by 24.15%.关键词：Undercooling;Cu-20Pb Hypomonotectic Alloy;Microstructure;Friction Performance
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发布时间：2023-12-18 - 摘要：The pure Pb rod was manufactured by sand mold gravity casting.Microstructure,chemical composition as well as physical properties of the casting ingot were characterized and analyzed by SEM,TEM and EDS.The results show that microstructure of the pure Pb is refined with more uniform size distribution.A strong{113}<uvw>type texture is formed during the casting process.The induction of impurities and the formation of casting defects can be well controlled through strictly technical measures,so the ingots with good physical properties are obtained through sand mold gravity casting.关键词：Sand Mold Gravity Casting;Pure Pb;Microstructure;Properties
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发布时间：2023-12-18
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