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Drawing-upsetting-extrusion-clinching of high-strength steel and aluminum alloy

Journal of Iron and Steel research International 2023年第10期30卷 1974-1986页

作者： Ling-feng Luo Shang-yu Huang Mei Yang Jian-hua Hu Bing Ou School of materials Science and engineering Wuhan University of TechnologyWuhan 430070HubeiChina hubei engineering research center for green precision material forming Wuhan University of TechnologyWuhan 430070HubeiChina Shanghai Technician School Shanghai 200437China

To realize good point connection between high-strength steel and aluminum alloy,a process of drawing-upsetting-extrusion-clinching was ***,the sheets were drawn;then,the bottom of the protrusion part was extruded,forming the necessary initial interlock;and finally,the protrusion part was reverse press clinched,forming a certain height of the clinched *** DP980 high-strength steel and A15083 aluminum alloy as the connection objects and using the method of numerical simulation combined with experimental test,the mold was made,and the experiment was carried out on the basis of numerical *** experimental results proved the feasibility of the process and the effectiveness of the numerical *** simulation and experimental results show that the necessary interlock in the drawing-upsetting-extrusion stage is the premise of effective *** relative protrusion height should be around 55.6%after *** best comprehensive mechanical properties measured by strength test were shear resistance of 2644 N,fatigue life of 24,535 times and peel resistance of 1522 *** failure analysis,the relationship between the interlock Tu and the neck thickness Tn of the joint with the best comprehensive mechanical properties was established as Tu=*** design method of die and process parameters when the sheet thickness changes was researched by numerical *** results show that the clearance between the punch and the die and the bottom thickness are directly proportional to the sheet thickness,and the drawing depth is directly proportional to the punch radius.

关键词： Clinching High-strength steel Aluminum alloy Process parameter Joint strength

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Influence of multiple laser shock peening treatments on the microstructure and mechanical properties of Ti-6Al-4V alloy fabricated by electron beam melting

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International Journal of Minerals,Metallurgy and materials 2022年第9期29卷 1780-1787页

作者： Liang Lan Ruyi Xin Xinyuan Jin Shuang Gao Bo He School of material engineering Shanghai University of Engineering ScienceShanghai 201620China research center of High-temperature Alloy precision forming Shanghai University of Engineering ScienceShanghai 201620China

Laser shock peening(LSP)is an attractive post-processing method to tailor surface microstructure and enhance mechanical performances of additive manufactured(AM)*** effects of multiple LSP treatments on the microstructure and mechanical properties of Ti-6Al-4V part produced by electron beam melting(EBM),as a mature AM process,were studied in this ***,surface topography,residual stress,and tensile performance of EBM-manufactured Ti-6Al-4V specimens were systematically analyzed subjected to different LSP *** distribution of porosities in EBM sample was assessed via X-ray computed *** results showed that EBM samples with two LSP treatments possessed a lower porosity value of 0.05%compared to the value of 0.08%for the untreated *** strength of EBM samples with two LSP treatments was remarkably raised by 12%as compared with the as-built *** grains ofαphase were refined in near-surface layer,and a dramatic increase in the depth and magnitude of compressive residual stress(CRS)was achieved in EBM sample with multiple LSP *** grain refinement ofαphase and CRS with larger depth were responsible for the strength enhancement of EBM samples with two LSP treatments.

关键词： additive manufacturing laser shock peening electron beam melting residual stress Ti-6Al-4V alloy mechanical properties

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Microstructural evolution and stress state related to mechanical properties of electron beam melted Ti-6Al-4V alloy modified by laser shock peening

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Journal of materials Science & Technology 2020年第15期47卷 153-161页

作者： Liang Lan Xinyuan Jin Shuang Gao Bo He Yonghua Rong research center of High-temperature Alloy precision forming School of Material EngineeringShanghai University of Engineering ScienceShanghai 201620China School of materials Science and engineering Shanghai Jiao Tong UniversityShanghai 200240China

This work characterizes microstructural evolutions of electron beam melted(EBM) Ti-6 Al-4 V alloy modified via laser shock peening(LSP).The depth stress distribution and tensile properties of EBM Ti-6 Al-4 V alloy were measured before and after *** results indicate that microstructure consists of β phase with 7.2%±0.4% vol.% and balance α lamellar in EBM sample,and the α lamella was refined into nano-equiaxed grains and submicro-equiaxed grains after *** dominant refinement mechanism is revealed during *** faults were found in the LSP-treated sample,and their corresponding planes were determined as(0001) basal plane,(1010) prismatic plane,and(1011) pyramidal plane obtained by high resolution transmission electron *** subgrains and high-angle grains formed during dynamic recrystallization were identified by selected area electron diffraction *** LSP treatment produces a significantly residual compressive stress approximately-380 MPa with the depth of compressive stress layer reaching 450 μ*** and elongation of the EBM sample were significantly increased after *** strength and ductility enhancements are attributed to compre s sive stress,grain refinement and grain gradient distribution of α phase.

关键词： Electron beam melting Ti-6Al-4V alloy Laser shock peening Microstructural evolution Stress state Mechanical properties

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Microstructure and mechanical properties stability of pre-hardening treatment in Al-Cu alloys for pre-hardening forming process

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International Journal of Minerals,Metallurgy and materials 2024年第3期31卷 539-551页

作者： Liping Tang Pengfei Wei Zhili Hu Qiu Pang hubei Longzhong laboratory Xiangyang 441000China hubei Key Laboratory of Advanced Technology for Automotive Components School of Automotive EngineeringWuhan University of TechnologyWuhan 430070China hubei engineering research center for green&precision material forming Wuhan University of TechnologyWuhan 430070China Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education School of Machinery and AutomationWuhan University of Science and TechnologyWuhan 430081China

The stability of the microstructure and mechanical properties of the pre-hardened sheets during the pre-hardening forming(PHF)process directly determines the quality of the formed *** microstructure stability of the pre-hardened sheets was in-vestigated by differential scanning calorimetry(DSC),transmission electron microscopy(TEM),and small angle X-ray scattering(SAXS),while the mechanical properties and formability were analyzed through uniaxial tensile tests and formability *** results in-dicate that the mechanical properties of the pre-hardened alloys exhibited negligible changes after experiencing 1-month natural aging(NA).The deviations of ultimate tensile strength(UTS),yield strength(YS),and sheet formability(Erichsen value)are all less than 2%.Also,after different NA time(from 48 h to 1 month)is applied to alloys before pre-hardening treatment,the pre-hardened alloys possess stable microstructure and mechanical properties as ***,with the extension of NA time before pre-hardening treatment from 48 h to 1 month,the contribution of NA to the pre-hardening treatment is *** a yield strength increment of 20 MPa is achieved,with no loss in *** limited enhancement is mainly attributed to the fact that only a limited number of clusters are transformed into Guinier-Preston(GP)zones at the early stage of pre-hardening treatment,and the formation ofθ''phase inhibits the nucleation and growth of GP zones as the precipitated phase evolves.

关键词： Al-Cu alloy pre-hardened alloy natural aging mechanical properties microstructure

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Influence of Extrusion Speed on the Microstructure Evolution, Interface Bonding and Mechanical Response of Mg MB26/Al 7075 Composite Rod

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Acta Metallurgica Sinica(English Letters) 2019年第2期32卷 253-262页

作者： Yu Chen Rui Zhang Tao Zhou Li Hu Jian Tu Lai-Xin Shi Yan Zhi Li-Wei Lu Qiang Chen Ben-Hong Liao Lei Liu Wen-Jun Ge Jing Xiao Ming-Bo Yang College of material Science and engineering Chongqing University of Technology Institute of Light Metal Structural materials Hunan University of Science and Technology Southwest Technology and engineering research Institute precision forming Integrated Manufacturing Technology of Collaborative Innovation center

The Mg MB26/Al 7075 composite rod,in which Mg MB26 serves as the sleeve and Al 7075 serves as the core,is fabricated via the process of *** influence of extrusion speed on the microstructure evolution,interface bonding and mechanical response of the Mg MB26/Al 7075 composite rod is *** results show that the typical extrusion texture of Mg sleeve does not change during co-extrusion;however,the average grain size in the Mg sleeve slightly changes from 1.57 lm in the case of extrusion speed of 0.3 mm/s to 2.78 lm in the case of extrusion speed of2.1 mm/*** thickness of interface transition layer increases significantly from 5.5 to 50 lm,and therefore,the interface bonding becomes deteriorative with increasing extrusion speed;in particular,many cavities emerge in the case of 1.2 and2.1 mm/s.

关键词： MB26/7075 composite rod Extrusion speed Microstructure evolution Interface bonding Mechanical response

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In situ synthesis of a porous high-Mn and high-Al steel by a novel two-step pore-forming technique in vacuum sintering

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Journal of materials Science & Technology 2020年第4期39卷 82-88页

作者： Chuanbing Zhuang Zhigang Xu Shangyu Huang Yu Xia Chuanbin Wang Qiang Shen hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China hubei Collaborative Innovation center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China School of materials Science and engineering Wuhan University of TechnologyWuhan 430070China State Key Lab of Advanced Technology for materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China hubei engineering research center for green precision materials forming Wuhan University of TechnologyWuhan 430070China

In this work, a novel in-situ two-step pore-forming process in vacuum sintering(ITPVS) technique combining low-temperature processing to produce open pores through the interdiffusion among the intrinsic components in the base steel, and subsequent high-temperature processing to further improve the porosities by the sublimation of Mn via previously formed open pores, was proposed to produce a lab-scale porous Fe Mn Al steel. For the first time, a high-Mn and high-Al steel with open and overall porosities of ~59.6 vol.% and ~63.7 vol.%(percent in volume, vol.%) was synthesized by isothermal holding of the quaternary elemental Fe/Mn/Al/C powder mixture at 640℃ for 1 h and the subsequent sintering at 1200℃ for 1 h. Elemental Al partly incorporated into/reacted with α-Fe and α-Mn after sintering at640℃ for 1 h, leading to the overall and open porosities promoting by ~26.6 vol.% and ~25.6 vol.%. After sintering at 1200℃, Fe Mn Al steel with increased porosities mainly comprising of austenite and α-Fe obtained. The compression strength and corresponding strain of the 1200℃-sintered porous specimen without crack on the surface was ~75 MPa and ~25%. The ITPVS technique takes advantage of using the intrinsic components like Al, Mn and Fe in steels to produce porous structure. This is beneficial to avoiding the contamination of the Fe Mn Al steel matrix caused by the employment of the foreign pore-forming agents.

关键词： Porous metal High manganese steel Two-stage sintering Reaction-diffusion Sublimation method

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晶粒尺寸对Inconel 718薄板塑性微变形行为的影响:实验与建模

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Journal of Central South University 2024年第5期31卷 1412-1425页

作者：纪开盛刘艳雄张怡俊宋燕利尹飞魏文婷 hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China hubei engineering research center for green precision material forming Wuhan University of TechnologyWuhan 430070China hubei Key Collaborative Innovation center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China

随着航空航天工业的迅速发展,对微型化Inconel 718薄板构件的需求越来越大。然而,晶粒尺寸显著影响金属薄板的塑性变形行为,在很大程度上限制了Inconel 718薄板构件的生产和应用。本文对不同晶粒尺寸的Inconel 718薄板进行了一系列单轴... 详细信息

随着航空航天工业的迅速发展,对微型化Inconel 718薄板构件的需求越来越大。然而,晶粒尺寸显著影响金属薄板的塑性变形行为,在很大程度上限制了Inconel 718薄板构件的生产和应用。本文对不同晶粒尺寸的Inconel 718薄板进行了一系列单轴拉伸试验和扫描电镜实验,研究了晶粒尺寸对其塑性变形行为的影响。通过EBSD技术表征了晶粒尺寸、晶粒取向和晶粒平均取向偏差,阐明了晶粒尺寸效应的变形机制。研究结果表明,随着晶粒尺寸的增大,在拉伸应力作用下,晶粒旋转和协调变形机制减弱,取向转变为的晶粒数量逐渐减少,从而导致屈服强度和最大抗拉强度显著降低;此外,随着晶粒尺寸的增大,晶粒内部的塑性变形明显减弱,晶界滑动逐渐成为拉伸过程中主要的变形机制,导致断裂应变减小,韧性断裂特征减弱。本文综合考虑晶粒尺寸和应变量影响,建立了能够应用于Inconel 718薄板的微成形研究的混合材料本构模型。

关键词： Inconel 718薄板晶粒尺寸力学性能断裂机理混合材料本构模型

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Microstructure and mechanical properties of 6082 aluminum alloy processed by preaging and hot forging

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Transactions of Nonferrous Metals Society of China 2022年第3期32卷 790-800页

作者： Lin HUA Pu-guang YUAN Ning ZHAO Zhi-li HU Hui-juan MA hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China hubei Collaborative Innovation center for Automotive Components Technology Wuhan University of TechnologyWuhan 430070China hubei research center for New Energy&Intelligent Connected Vehicle Wuhan University of TechnologyWuhan 430070China hubei engineering research center for green&precision material forming Wuhan University of TechnologyWuhan 430070China

A novel forging process of 6082 aluminum alloy is proposed, which can save time and reduce energy consumption while ensuring mechanical properties. In this process, the billet was preforged at solid solution temperature and then preaged, followed by warm forging at 200 ℃. The flow behavior of the preaged samples during compression and the mechanical properties of the formed samples were investigated by hot compression tests. The differences in the precipitated phases of the samples with different processing parameters were analyzed by scanning electron microscopy(SEM), transmission electron microscopy(TEM), and differential scanning calorimetry(DSC). The best comprehensive performance was obtained after preaging at 120 ℃ for 4 h and holding at 200 ℃ for 10 min, and the Vickers hardness was HV 128, which was higher than that of the traditional process. Precipitation strengthening and dislocation strengthening were improved when the samples were formed at 200 ℃. This forging process shows the advantages of short time consumption and low energy consumption, which can effectively improve the production efficiency while ensuring the strength after forming.

关键词： 6082 aluminum alloy forging preaging compression behavior hardness precipitates

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Analysis of flow stress of ZK60 wrought magnesium at elevated temperatures

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中国有色金属学会会刊：英文版 2006年第A02期16卷 303-306页

作者：杨亚琴李保成张治民张星 College of materials Science and engineering North University of China Taiyuan 030051 China engineering center for precision forming of Shanxi Province Taiyuan 030051 China

The true stress-strain curves of compressed ZK60 alloy have two typical characters. Most thermal simulation compressing curves of ZK60 have the obvious character that around 0.2 in strain the stress reaches the peak and declines rapidly afterwards and lands the lowest. The decline of the curve illustrates that the test specimen has been destroyed and crackles can be found on the test specimen correspondingly. And the other true stress increases to a peak and then decreases to a steady state, indicating that dynamic recrystallization has occurred in ZK60 alloy. From the analysis of the results we can receive the optimized composite of the deformed parameters and get the reasonable deformed temperatures to be 200 degrees C or 400 degrees C, which can play a directing role in determining the deforming technology of wrought magnesium alloys.

关键词：锻镁 ZK60 形变合金应力-应变曲线高温

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Influence of aging on microstructure and properties of ZK60 magnesium alloy

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中国有色金属学会会刊：英文版 2006年第A02期16卷 332-334页

作者：张治民张星杨亚琴 School of materials Science and engineering North University of China Taiyuan 030051 China engineering center for precision forming of Shanxi Province Taiyuan 030051 China

The different aging process was investigated for ZK60 magnesium alloy to get the ideal synthetic properties. The results show that the values of strength, hardness and plasticity of ZK60 magnesium alloy increase at first and then decrease with increasing aging temperature, the suitable aging temperature of ZK60 alloy is from 160 to 180 degrees C. At the meantime, the microstructures of appear mesh texture under high ageing temperature, this is the main reason why the mechanical properties decrease.

关键词： ZK60 镁合金时效显微结构力学性质

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