最新刊期
      卷 44 ， 期 7 ， 2024

        Current Recommendation

      • “在非真空条件下，采用普通卧式压铸机制备的Al-9Si合金，通过添加Zr元素，显著提高了其铸态抗拉强度、伸长率和硬度，为铝合金材料性能优化提供了新途径。”
        FAN Xiaoming,LÜ Xiaogang,LU Xiaobin,LUO Shixu,HUANG Gangfu,GAO Xiaolin
        Vol. 44, Issue 7, Pages: 865-869(2024) DOI: 10.15980/j.tzzz.2024.07.001
        摘要：Tensile specimens of Al-9Si-0.6Fe-0.2Mn-0.2Mg-0.6Cu-0.3Sc-xZr （x= 0，0.1，0.2，0.3， mass fraction， %） were prepared by horizontal die casting machine under non-vacuum conditions. The as-cast microstructure and mechanical properties of the alloy were investigated by metallographic microscope， scanning electron microscope， electron probe and electronic universal material testing machine. The results indicate that Zr addition can enhance the structure refinement and modification of alloy， and the tensile strength， elongation and hardness of the alloy is increased firstly and then decreased with the increase of Zr content. When 0.2%Zr is added， the primary α-Al phase has optimal refining effect， which is transformed from flower-like to fine dendrite. The eutectic Si phase also achieves desirable modification effect， which is transformed from worm-like to granular phase. The tensile strength， elongation and microhardness of as-cast alloy reach the maximum value， which are 289.3 MPa， 4.9% and 114.3 HV， respectively， and the tensile fracture mode is characterized by ductile fracture.  
        关键词：Al-Si Die Casting Alloy;Zr;Microstructure;Mechanical Properties   
        5
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486627 false
        发布时间：2024-07-18
      • “在材料科学领域，研究人员通过真空感应法制备了不同Y含量的Ti52-xAl48Yx合金，发现Y的添加能显著提高合金的硬度和抗压强度。”
        FAN Jianglei,ZHOU Zhao,WEI Zexin,WU Shen,ZHOU Xiangkui,LI Ying,WANG Yan
        Vol. 44, Issue 7, Pages: 870-877(2024) DOI: 10.15980/j.tzzz.2024.07.002
        摘要：Ti52-xAl48Yx （x=0~1.0） alloy，was fabricated by vacuum induction method， and effects of Y content on microstructure and mechanical properties of Ti52-xAl48Yx alloy were investigated. The results indicate that Y addition can significantly refine the grain， while Al3Y and Y2O3 phase are generated in the alloy. With the increase of Y content， the grain size is decreased， and hardness is increased， which reaches the maximum of 372 HV at 1.0%. The compressive strength is increased and then decreased with the increase of Y content， reaching the maximum of 2 230 MPa at 0.3%， which is 32% higher than that of base alloy.  
        关键词：TiAl Alloy;Y-alloying;Microstructure;Mechanical Properties   
        5
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66487145 false
        发布时间：2024-07-18

        Research·Review

      • “稀土元素在非晶态合金中的应用，为非晶涂层与薄膜性能提升提供新思路。”
        WEN Yongqing,SHI Zhilin,ZHANG Haoran,TANG Peng,LIANG Shunxing,MA Mingzhen
        Vol. 44, Issue 7, Pages: 878-885(2024) DOI: 10.15980/j.tzzz.2024.07.003
        摘要：In view of characteristics of RE elements such as deoxygenation， melt purification， and difficulty in acting as heterogeneous nucleation particles in amorphous matrices after oxidation， the influence of RE or oxide doping on glass formation ability （GFA）， wear resistance， and anti-corrosion of amorphous coatings and films was briefly reviewed. Effects of RE on the improvement of amorphous forming ability and soft magnetic properties of magnetic amorphous alloy thin strip and enhancement of amorphous forming ability and mechanical properties of bulk amorphous alloy were analyzed. Finally， the application prospects of RE elements in amorphous alloys was also forecast.  
        关键词：Amorphous Alloys;RE Doping;Glass Formation Ability;Corrosion Resistance;Mechanical Properties   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486591 false
        发布时间：2024-07-18
      • “激光熔覆技术在陶瓷涂层领域的研究进展，为解决涂层性能问题提供解决方案。”
        ZHANG Lichao,MI Guofa,LI Lei,HUO Xiaoyang,LIU Weidong,WANG Xiuhu
        Vol. 44, Issue 7, Pages: 886-896(2024) DOI: 10.15980/j.tzzz.2024.07.004
        摘要：The principle of laser cladding technology was briefly summarized， and the research status as well as existing problems of laser cladding pure ceramic coating， cermet composite coating， bioceramic coating， nano-ceramic coating and precursor conversion ceramic coating were systematically described. In addition， effects of laser cladding process parameters and auxiliary treatment on composition， macro morphology and properties of ceramic coatings were reviewed， and the improvement measures and prospects of laser cladding cermet coating were put forward.  
        关键词：Laser Cladding;Ceramic Coating;Process Parameter   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66487109 false
        发布时间：2024-07-18

        Research·Computer Application

      • “在新能源汽车前机舱压铸生产线领域，专家建立了“工艺参数-下线质量”大数据集，并通过机器学习模型优化工艺参数，为压铸工艺控制提供新方案。”
        WANG Xin,WANG Xingchen,PENG Liming,FU Penghuai
        Vol. 44, Issue 7, Pages: 897-901(2024) DOI: 10.15980/j.tzzz.2024.07.005
        摘要：“Parameters-Offline quality” big database was established by collecting the data from the die-casting production line of forward engine room of new energy vehicles. Then， four types of machine learning models were used to train the dataset. The results indicate that the bagged decision trees model has the satisfied prediction accuracy and generalization ability， and the tolerated accuracy of prediction results of the test dataset reaches 77.3%. Furthermore， the influences of key parameters on the quality of castings were ranked by calculating the relative influences and sensitivity levels， which has important guiding significance in optimizing and controlling of pressure die-casting parameters.  
        关键词：Machine Learning;Data Driven;Bagged Decision Trees Model;Key Parameters;Light Alloys   
        5
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486463 false
        发布时间：2024-07-18
      • “在钢铁制造领域，专家提出了一种神经网络模型，通过分析钢水水面波动推断内部气泡羽流形态，优化长水口吹氩工艺，提高夹杂物去除率。”
        LI Xiaoting,JIN Yan,WU Jianzhou,LIU Ziyu,LIN Peng,HUANG Zhengchao,LING Hongzhi
        Vol. 44, Issue 7, Pages: 902-908(2024) DOI: 10.15980/j.tzzz.2024.07.006
        摘要：Tundish long nozzle blowing argon lacks the means to monitor the bubble plume below the molten steel surface， which becomes an obstacle to the use of long spout blowing argon to remove inclusions in the molten steel. A new algorithm of neural network model was proposed to infer the morphology of bubble plume inside molten steel from the fluctuation pattern of the molten steel surface， and the dataset was constructed by the mathematical model. The results indicate that inference accuracy reaches 0.998 after learning from 2 000 datasets. A water model was established to verify the algorithm， and the water model and mathematical model were combined to optimize the argon blowing process at the long spout， improving the removal rate of inclusions and prevent the occurrence of slag rolling.  
        关键词：Tundish;Flow Field;Neural Networks;Deep Learning;Learning Machine   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486462 false
        发布时间：2024-07-18
      • “在材料加工领域，研究人员建立了基于SPH-FEM耦合的挤压铸造过程数值模拟程序，为铸造工艺优化提供解决方案。”
        GE Taotao,ZHAO Zhan,NIU Xiaofeng,WANG Tiancheng,LIU Zhaoxuan
        Vol. 44, Issue 7, Pages: 909-915(2024) DOI: 10.15980/j.tzzz.2024.07.007
        摘要：The model establishment and simulation based on coupling analysis method of smoothed particle hydrodynamics （SPH） and finite element method （FEM） were described emphatically. The flow field and thermal stress field of squeeze casting process were numerically simulated， and the simulation program of SPH-FEM coupling analysis method was independently compiled. The simulation results of SPH filling process were compared with those of general commercial software， and the results are basically consistent. The simulation results of temperature field and stress field in the solidification process of FEM were analyzed. It is found that the cooling rate and effective stress value reach the highest at the thin wall of the side of the support part. The research shows that the developed numerical simulation program of squeeze casting process based on SPH-FEM coupling has accurate simulation results and reliable operation.  
        关键词：Squeeze Casting;Smooth Particle Hydrodynamics（SPH）;Finite Element Method;Numerical Simulation   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486461 false
        发布时间：2024-07-18
      • “在材料科学领域，研究人员利用ProCAST软件对TD3合金真空自耗熔炼过程进行数值模拟，分析了熔速、传热系数和熔炼温度等对铸锭最大等效应力的影响，为防止裂纹形成提供解决方案。”
        WANG Jianlei,HAO Mengyi,TAN Qiming,XIAO Minghao,ZHANG Ping,HUANG Hao,DING Xiaoming
        Vol. 44, Issue 7, Pages: 916-922(2024) DOI: 10.15980/j.tzzz.2024.07.008
        摘要：The vacuum arc melting process of TD3 alloy was simulated by the ProCAST software to investigate the distribution law of molten pool shape， temperature field and stress field under different conditions. The influence of process parameters such as melting rate， heat transfer coefficient and melting temperature on the maximum effective stress of ingot was analyzed， and cracks were predicted and verified. The results indicate that the shape of molten pool is gradually deepened from flat shape to funnel shape with the melting proceeding. When the temperature of whole TD3 ingot is decreased below 773 K， the effective stress of ingot circumference surface reaches up to 614 MPa at 78 mm from the bottom. The outer surface of the ingot is in a state of compression， while the center is in a state of tension， and the great difference between internal and external stress leads to cracks. Through reducing melting rate less than 4 kg/min or reducing cooling rate to make the heat transfer coefficient ≤2 000 W/ （m2·K）， it can shorten the air gap width， thereby improving the crack defects.  
        关键词：TD3 Titanium Alloy;Vacuum Arc Remelting;Numerical Simulation;Effective Stress;Crack   
        5
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66487049 false
        发布时间：2024-07-18
      • “在熔模铸造工艺优化领域，专家构建了集成计算平台，实现了铸造工艺-缺陷快速仿真集成优化，效率提升91.66%。”
        WEI Pengxiao,GUO Zhao,DING Zhengyi,WU Wenyun,BAO Chaojun,QIN Rong,WANG Donghong
        Vol. 44, Issue 7, Pages: 923-927(2024) DOI: 10.15980/j.tzzz.2024.07.009
        摘要：Currently， the optimization of investment casting processes heavily relies on empirical trial-and-error methods， resulting in long optimization cycles， high labor costs， low operational efficiency， and a lack of algorithmic optimization. Therefore， an integrated computing platform for investment casting processes was developed based on the ProCAST finite element simulation software and multitasking batch processing technology， which integrates various functions， including Design of Experiments （DOE） algorithms， finite element simulation， automatic extraction of result data， surrogate model construction， and collaborative multi-objective optimization. Taking a turbine guide vane as example， integrated optimization of casting process-defect simulation was realized with shrinkage as target value， pouring temperature， ambient temperature and thermal emissivity as variables. The efficiency of integrated computing platform is improved by 91.66% compared with that of traditional simulation optimization.  
        关键词：Materials Genomic Engineering;Integrated Computational Materials Engineering;Intelligent Casting;Material Informatics   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66487011 false
        发布时间：2024-07-18
      • “在材料科学领域，研究人员通过ABAQUS平台二次开发，建立了热等静压过程顺序热力耦合模型，为ZTC4合金铸件热等静压工艺优化提供了解决方案。”
        GAN Tian,YIN Hao,CHEN Yuhao,JI Zhijun,CUI Xinpeng,NAN Hai,QIE Xiwang,LIAO Dunming
        Vol. 44, Issue 7, Pages: 928-934(2024) DOI: 10.15980/j.tzzz.2024.07.010
        摘要：Thermal isostatic pressure temperature field solver was independently developed based on ABAQUS platform， and the temperature field data was loaded into the ABAQUS stress field model as boundary conditions through programming interface to establish the sequential thermodynamic coupling model during hot isostatic pressure process. In order to verify the accuracy， hot isostatic pressing simulation was conducted and validated， and effects of hot isostatic pressing temperature on defect closure of ZTC4 alloy castings were investigated. The results reveal that the size error between simulated and experimental results is less than 5%， indicating that 915 ℃ is the satisfied temperature for hot isostatic pressing of ZTC4 alloy castings.  
        关键词：Titanium Alloy;Hot Isostatic Pressing;Numerical Simulation   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66487034 false
        发布时间：2024-07-18

        Research·Alloy Process

      • “采用真空热压烧结工艺制备的CuCrFeMnNi高熵合金，经高温退火处理后显著软化，其显微硬度降低至烧结态的52%，主要归因于ρ相的分解。”
        SHAO Yayun
        Vol. 44, Issue 7, Pages: 935-939(2024) DOI: 10.15980/j.tzzz.2024.07.011
        摘要：CuCrFeMnNi high-entropy alloy was fabricated using vacuum hot pressing sintering process， and annealed at 600~900 ℃ for 12 h. The effects of annealing temperature on microstructure and microhardness of alloy were investigated by microhardness testing， phase analysis and microstructure observation. The results reveal that the sintered hardness of CuCrFeMnNi high-entropy alloy is around 543 HV， which is gradually decreased with the increase of annealing temperature. With annealing temperature of 900 ℃， the microhardness is decreased to 268 HV， which is about 52% times of the sintered one， indicating that the alloy undergoes significant annealing softening after high-temperature annealing treatment. XRD patterns demonstrate that the CuCrFeMnNi high-entropy alloy is transformed from a multiphase structure of sintered FCC main phase （FCC1+FCC2） + ρ phase to a single-phase structure of FCC2 phase. Therefore， the annealing softening is mainly attributed to the decomposition of ρ phase.  
        关键词：High-entropy Alloy;Hardness;Annealing Temperature;Annealing Soften;Phase Transformation   
        5
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486996 false
        发布时间：2024-07-18
      • “在材料科学领域，研究人员通过高能球磨和真空烧结制备了L12型Al67Cu8Ti25金属间化合物，并探索了其作为细化剂在铝合金中的应用，为铝合金微观组织控制提供了新方法。”
        CHEN Xu,XI Weiguo,CHEN Ji,CHENG Jingfan,CAI Qizhou,JIANG Wenming
        Vol. 44, Issue 7, Pages: 940-945(2024) DOI: 10.15980/j.tzzz.2024.07.012
        摘要：The L12-Al67Cu8Ti25 intermetallic compound was prepared by high-energy ball milling and vacuum sintering， which was crushed and mixed with Al powder to fabricate Al-25Al67Cu8Ti25 compound refiner. The influence of milling time and sintering temperature on the preparation of L12-Al67Cu8Ti25 intermetallic compounds were investigated. Taking pure aluminum and Al-5Cu-Mn cast aluminum alloys as objects， effects of compound refiners on the macrostructure and microstructure of α-Al as well as the action mechanism were investigated. The results indicate that the single-phase L12-Al67Cu8Ti25 compound particles are fabribated by sintering the powder at 600 ℃. With the increase of milling time， the average size of sintered compounds is decreased to 11 μm， and the morphology tends to be spherical. Al-25Al67Cu8Ti25 compound refiner has a desirable refining effect on α-Al， and the grain size of pure aluminum and Al-5Cu-Mn alloys are refined to 224 μm and 137 μm， respectively， after adding 0.25% Al67Cu8Ti25 compound refiner. L12-Al67Cu8Ti25 compound can act as an effective nucleation of α-Al with a mismatch degree of 2.35%， which is less than that of Al3Ti， leading to stronger heteronuclear ability.  
        关键词：L12-Al67Cu8Ti25 Intermetallic Compound;Microstructure;Grain Refinement;Heterogeneous Nucleation   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486623 false
        发布时间：2024-07-18
      • “最新研究揭示了铸造Be-Al合金界面的微观结构，为合金设计提供新见解。”
        YANG Yiqun,WANG Dongxin,ZHANG Peng,LI Junyi,XIE Yao,LIU Zhaogang,LI Zhengfei,WU Zipei
        Vol. 44, Issue 7, Pages: 946-948(2024) DOI: 10.15980/j.tzzz.2024.07.013
        摘要：The interface of cast beryllium aluminum alloy was investigated by transmission electron microscopy （TEM）， high-resolution transmission electron microscopy （HRTEM） and energy dispersive spectrometry （EDS）. The results indicate that absence of interfacial reaction is observed at the Be-Al interface with satisfied bonding. The interface geometry of as-cast Be-Al alloy is a semi-coherent interface， and the Be-Al interface is a combination of Be （0001）/ Al （110） base planes. Meanwhile， BeO and Al2O3 particles exist at the interface.  
        关键词：As-cast Beryllium Aluminum Alloy;Interface;HRTEM;Investment Casting   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486917 false
        发布时间：2024-07-18
      • “在材料科学领域，研究人员通过注射成形法制备了半固态AZ91D镁合金，分析了其显微组织和力学性能，为提高镁合金应用性能提供了新途径。”
        GUO Chunrong,XIE Shengchuan,CHEN Chihui,WANG Jiajun,WANG Hongping,FU Xia,CHEN Yong,LI Xiang
        Vol. 44, Issue 7, Pages: 949-953(2024) DOI: 10.15980/j.tzzz.2024.07.014
        摘要：The semi-solid magnesium alloys were prepared using injection molding at near liquidus temperatures based on AZ91D alloy. The microstructure of AZ91D alloy at different temperatures was analyzed， and room temperature mechanical properties were measured. Microstructure of the alloy was observed by optical microscopy （OM）， and scanning electron microscopy （SEM/EDS）. Phase composition analysis was performed by X-ray diffraction （XRD）. The results indicate that AZ91D alloy is mainly composed of α-Mg matrix β-Mg17Al12 phase the injection temperature of 595 ℃ and 600 ℃ is beneficial to obtain fine and dispersed primary spherical crystals. The mechanical properties of AZ91D alloy formed by injection molding at 595 ℃ and 600 ℃ present desirable with tensile strength， yield strength， and elongation of 274 MPa， 163 MPa， 8.4% and 269 MPa， 162 MPa， 6.1%， respectively， which are higher than the lower limit values specified by national standards for liquid die-casting parts.  
        关键词：AZ91D Alloy;Injection Molding;Semi-solid;Near Liquidus Line;Microstructure and Properties   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486459 false
        发布时间：2024-07-18

        Research·Alloy Performance

      • “最新研究发现，Al-Cu-Mn耐热铸造铝合金在不同温度下力学性能和微观组织变化显著，为高温应用提供重要参考。”
        HONG Runzhou,DU Chenyu,SHI Kexin,ZHANG Zhe
        Vol. 44, Issue 7, Pages: 954-958(2024) DOI: 10.15980/j.tzzz.2024.07.015
        摘要：The mechanical properties of an Al-Cu-Mn heat-resistant cast aluminum alloy at room temperature， 250 ℃， 300 ℃ and after stabilization treatments under different temperatures as well as microstructure under different heat-treated states were investigated. The results indicate that the tensile strength of alloy is decreased and the elongation is increased with the increase of test temperature or stabilization treatment temperature. The tensile strength reaches the minimum after stabilization at 300 ℃ for 100 h， which also reaches over 200 MPa. The main strengthening phases of alloy are θ phase， S phase and T phase. After high temperature stabilization treatment， the morphologies of θ and T phase are coarsened， resulting in a decrease in strength of alloy.  
        关键词：Heat-resistant Aluminum Alloy;Stabilization Treatment;Mechanical Properties;Microstructure   
        3
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486938 false
        发布时间：2024-07-18
      • “在5G基站散热壳体材料研究中，通过时效处理显著提升压铸铝合金电导率，为5G通信设备散热问题提供解决方案。”
        YANG Shuang,WU Junjie,WANG Mengmeng,HUANG Zhongjia,LIU Tong,ZHAO Yu,HONG Ronghui,YAO Yingwu,WANG Jun
        Vol. 44, Issue 7, Pages: 959-964(2024) DOI: 10.15980/j.tzzz.2024.07.016
        摘要：In view of the inversion problem between strength and electrical （thermal） conductivity of die-cast aluminum heat sinks in 5G base stations， effects of aging treatment on microstructure and conductivity of die-cast Al-7.5Si-0.8Fe aluminum alloys were investigated through a combination of thermodynamic calculations and experimental research by PANDAT thermodynamic calculations， metallographic microscopy， scanning electron microscopy， X-ray diffraction， and transmission electron microscopy. The results indicate that the conductivity of alloy is significantly improved after heat aging treatment at 320 ℃ for 1 h. Al-Fe-Si ternary phases and Si phase are precipitated along the grain boundaries and interior， respectively， thus reducing the solid solubility of Fe and Si in Al matrix. In addition， the continuity of eutectic Si network is deteriorated after aging， accompanied with the increased connectivity of the aluminum matrix， which is the main reason for the enhancement of conductivity.  
        关键词：Die-cast Aluminum Alloy;Heat Sinks;Thermal Conductivity;Conductivity;Thermodynamic Calculation   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66487009 false
        发布时间：2024-07-18
      • “在铝合金材料研究领域，专家通过分析2A14铝合金铸锭缺陷，为降低缺陷产生几率提供解决方案。”
        ZHANG Jiaojiao,SUN Xiaohan,HE Yongdong,ZHAO Yikun
        Vol. 44, Issue 7, Pages: 965-970(2024) DOI: 10.15980/j.tzzz.2024.07.017
        摘要：The large-size 2A14 aluminium alloy ingots were analyzed by ultrasonic nondestructive flaw detection， industrial CT， metallurgical microscope （OM）， scanning electron microscope （SEM）， energy spectrum analysis （EDS）， and tensile test to investigate the formation mechanism of defects. The results indicate that defects in 2A14 aluminium alloy ingot are dominated by oxide inclusions， which presents black irregularity and are mainly concentrated in the grain boundary and center of ingot. Oxide inclusion defects are commonly generated in the melting and casting stage， accompanied by hydrogen absorption phenomenon， which is one of the causes of crack sources. The investigation on oxide inclusion defects in aluminium alloys and optimization of production process parameters contribute to defect reduction in aluminium alloys.  
        关键词：2A14 Aluminium Alloy;Oxide Inclusions;Hydrogen Absorption;Defect Analysis   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486625 false
        发布时间：2024-07-18
      • “稀土Y对ZL114A合金进行变质处理，显著提升其力学性能，当Y含量为0.6%时，合金抗拉强度、伸长率及硬度达到最优。”
        ZHU Jinsong,LU Gang,CHEN Xiao,LIAO Qingchun,LIAO Yi,CHEN Yisi
        Vol. 44, Issue 7, Pages: 971-974(2024) DOI: 10.15980/j.tzzz.2024.07.018
        摘要：In order to improve the mechanical properties of ZL114A， the rare earth Y was added to modify ZL114A alloy under the mechanical vibration， and the influence of Y on microstructure and mechanical properties was investigated. The results indicate that rare earth Y can effectively refine α-Al dendrites and promote the transformation of α-Al dendrites from coarse dendritic to rose-like. Moreover， the eutectic silicon exhibits short rods and uniform distribution. With the increase of Y content， the tensile strength， elongation， and hardness of alloy presents a trend of increasing firstly and then decreasing. The secondary dendrite spacing of alloy reaches the minimum of 20.4 μm with 0.6% Y， and the tensile strength， elongation， and hardness values reach the maximum， which are 370.92 MPa， 6.8%， and 91.08 HV， respectively. When Y content exceeds 0.6%， α-Al is gradually coarsed， and the rare earth phase is converted from small blocks to long rods.  
        关键词：ZL114A alloy;Rare Earth Y;Mechanical Vibration;Microstructure;Mechanical Properties   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486857 false
        发布时间：2024-07-18

        Research·Additive Manufacture

      • “采用Rhino软件设计多孔结构TC4骨科植入物，通过仿真与实验探究力学性能，为骨科植入物设计提供新思路。”
        ZHU Chencheng,CHEN Hongling,FU Gaosheng,ZHANG Chen,CHEN Jian
        Vol. 44, Issue 7, Pages: 975-981(2024) DOI: 10.15980/j.tzzz.2024.07.019
        摘要：Rhino software was utilized to design porous TC4 orthopedic implant models， and statics simulation was conducted combined with finite element analysis to obtain porous structures as well as stress distribution and equivalent elastic modulus under different porosities. Porous TC4 orthopedic implants were printed by laser selective melting （SLM）， and quasi-static compression experiments and nanoindentation experiments were carried out to investigate the heterogeneity in mechanical properties of porous structures with different porosities. The simulation results reveal that with increasing in the porosities of porous structures， the average stress is decreased. With the same porosity， the average stress， equivalent elastic modulus and permeability of regular porous structures are greater than those of irregular ones. The elastic modulus of regular porous structure is between 4.18~9.71 GPa， and that of irregular porous structure is between 2.69~5.84 GPa， meeting the elastic modulus range of human bone. The compressive strength， elastic modulus and wear resistance of the regular porous structures are greater than those of irregular ones， which is in consistent with the simulation results.  
        关键词：TC4;SLM;Porous Structure;Orthopedic Implants;Finite Element Analysis   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486460 false
        发布时间：2024-07-18
      • “在增材制造领域，专家建立了多激光束热力耦合模型，分析了其对温度、应力及等效塑性应力分布的影响，为提高制造质量提供解决方案。”
        ZHANG Huiqiang,ZHANG Ronghui
        Vol. 44, Issue 7, Pages: 982-986(2024) DOI: 10.15980/j.tzzz.2024.07.020
        摘要：AM thermo-mechanical coupling model with multi-laser beam （main laser beam， multiple post-processing laser beams） was established. Effects of the multi-laser beam mode on temperature history， overall stress evolution history and equivalent plastic stress distribution during cooling were analyzed， and simulation results were compared with those of single laser beam mode. The results indicate that the temperature history， overall stress evolution history and equivalent plastic stress distribution of cladding layers present similar trends for both modes. As the amount of post-processed laser beams increases， the peak temperature， overall stress and equivalent plastic stress levels are significantly increased， leading to cracks and fractures.  
        关键词：Multi-laser;Additive Manufacturing;Temperature History;Residual Stress   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486855 false
        发布时间：2024-07-18

        Application·Die Casting

      • “铝合金低压铸造轮毂成形工艺优化，通过冷却通道设计和数值模拟，显著提升良品率。”
        LI Xinyu,SU Xiaoping
        Vol. 44, Issue 7, Pages: 987-991(2024) DOI: 10.15980/j.tzzz.2024.07.021
        摘要：An aluminum alloy low wheel hub was taken as the research object to explore the optimal low-pressure casting process parameters. Design of cooling channels and optimization of experimental parameters for potential shrinkage porosities in the thick parts of the tire bead seat and the connection between the rim and spoke were carried out to solve the probability of defects in this area and improve the yield rate. The numerical simulation results of the ProCAST software were used as evaluation indicators， and the optimal process parameters were obtained based on orthogonal experimental comparison results. The results reveal that with pouring temperature of 680 ℃， mold temperature of 240 ℃， the filling pressure of 50 MPa， the holding pressure of 80 MPa， and the holding time of 420 s，the shrinkage porosity of the casting is significantly improved. Multiple cooling schemes based on the pouring condition were designed， and the relatively optimized production scheme was presented.  
        关键词：Aluminum Alloy Wheel Hub;Low Pressure Casting;Numerical Simulation;Process Optimization   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486621 false
        发布时间：2024-07-18
      • “在异型舱体铸造领域，专家设计低压浇注工艺方案，通过ProCAST软件模拟，优化工艺，成功避免缩松、缩孔缺陷，实现I类铸件要求。”
        WANG Kun,LIU Yingzhuo,YAO Fei,CHEN Ge,ZOU Wenbing
        Vol. 44, Issue 7, Pages: 992-994(2024) DOI: 10.15980/j.tzzz.2024.07.022
        摘要：Aimed at the structural characteristics and casting difficulties， the low pressure casting process of heterotypic cabin was designed. ProCAST software was applied to simulate the filling and solidification field， and origination of shrinkage porosities （holes） was analyzed. After processing optimization， the defects are avoided by adding the thickness of the cold iron in U and Y parts， achieving the formation of cabin， which meet the standards of Class I cast.  
        关键词：Heterotypic Cabin;Low Pressure Casting;Numerical Simulation;Defect Control   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486815 false
        发布时间：2024-07-18
      • “在压铸机压射速度研究领域，专家建立了基于LSTM神经网络的压射速度预测模型，为提高压铸机性能提供解决方案。”
        ZHONG Jianhui,LOU Junqiang,FENG Guangming,HU Jiangpin,LIU Yagang,PENG Wenfei,YU Junhe
        Vol. 44, Issue 7, Pages: 995-999(2024) DOI: 10.15980/j.tzzz.2024.07.023
        摘要：Aiming at the problem of great error in the theoretical model of the relationship between injection speed and cartridge valve spool displacement during injection of die casting machine， a mechanism model of injection speed system of die casting machine based on time series data-driven was proposed. Taking advantage of the long short-term memory （LSTM） neural network to process the time series， the intrinsic relationship between the injection speed and the displacement of the valve spool was established， and influence of noise on the model accuracy was reduced by the wavelet threshold denoising method. The root mean square error （RMSE） of the established model is 0.336% and the correlation coefficient （R2） is 0.998， which can accurately predict the displacement of valve spool. By comparing with the calculation results of theoretical formula model， the average error of the prediction results of the model is 0.11%， which is superior to the theoretical formula model.  
        关键词：Die Casting Machine;Injection System;LSTM;Data-driven;Wavelet Decomposition   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486813 false
        发布时间：2024-07-18

        Application·Permanent Mold Casting

      • “在发动机活塞铸造领域，专家通过再现试验和模拟仿真，揭示了过滤网漏放或位置偏移是导致顶部气孔缺陷的主要原因，并提出了优化方案。”
        LI Tingyong
        Vol. 44, Issue 7, Pages: 1000-1003(2024) DOI: 10.15980/j.tzzz.2024.07.024
        摘要：Crown bubbles are the main casting defects of piston with casted crown， which is also one of the main causes of engine piston failure. Through the reproduction test of crown bubbles， the influence of aluminum liquid temperature， pouring speed， filter mesh structure， and filter position on the defect was investigated. The results indicate that the missing filter or position deviation are the main causes of crown bubbles， which is further verified by simulation analysis. By optimizing the structure of fixation groove in filter， the deviation of filter position is effectively solved and the crown bubbles are eliminated. The casting missing filter was identified by infrared sensor to ensure the timely detection of leakage.  
        关键词：Aluminum Piston;Casting;Crown Bubble   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486771 false
        发布时间：2024-07-18

        Application·Investment Casting

      • “精密铸造工艺新突破，类树枝状组树方式提升效率，易割浇口降低成本。”
        WANG Yabing,WANG Qilan
        Vol. 44, Issue 7, Pages: 1004-1006(2024) DOI: 10.15980/j.tzzz.2024.07.025
        摘要：For small pieces by investment process， the tree assembling efficiency of single piece is low with small quantities， and the yield rate of castings is relatively low. Meanwhile， the cost of cutting and grinding gate in the post-treatment process is higher with low efficiency. The tree assembly similar to dendrimer was adopted， which could greatly improve quantities and efficiency of tree assembly as well as the yield rate. A straight gate was replaced with cut-free gate， which could decrease the loss of metal and improve cutting and grinding efficiency， thus reducing the overall production cost.  
        关键词：Yield Rate;Investment Casting;Gating System   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486775 false
        发布时间：2024-07-18
      • “在材料科学领域，专家确定了LCC低温阀门钢的合理成分和热处理工艺，显著提升了其低温冲击韧度。”
        LI Aizong
        Vol. 44, Issue 7, Pages: 1007-1008(2024) DOI: 10.15980/j.tzzz.2024.07.026
        摘要：The reasonable composition range of C， Si， Mn and other main elements in LCC low-temperature valve steel was determined through practice verification， and the appropriate heat treatment process was identified. The comprehensive mechanical properties of castings， especially low-temperature impact toughness， reaches the standard of customer requirements.  
        关键词：Low Temperature Steel;Valve;Low-temperature Impact Toughness;Investment Casting   
        4
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 66486773 false
        发布时间：2024-07-18
      0