Variant selection induced by electropulsing:Optimization in the microstructure of selective laser melted Ti-6Al-4 V alloy  

作　　者：Xudong Yan Xiaofeng Xu Yang Zhao Yachong Zhou Zhicheng Wu Lai Wei Yongqiang Yu Chao Wu 

机构地区：[1]Key Laboratory of Automobile Materials,Ministry of Education,and Department of Materials Science and Engineering,Jilin University,Changchun 130025,China [2]Weihai Bionics Research Institute-Jilin University,Weihai 264402,China [3]Key Laboratory of Bionic Engineering Ministry of Education,Jilin University,Changchun 130025,China

出　　处：《Journal of Materials Science & Technology》2023年第28期219-224,共6页材料科学技术（英文版）

基　　金：the National Key Re-search and Development Program of China(Nos.2020YFB2008300,2020YFB2008303 and 2020YFB2008304);the Provincial Natural Science Foundation of Shandong(Grant No.ZR202102220408);the National Natural Science Foundation of China(Grant No.51701080);the Talent Development-Excellent Young Talents Fund Project,China(Grant No.20190103053JH).

摘　　要：Selective laser melting(SLM)is one of the most popular addi-tive manufacturing(AM)technologies.As a near-net shape man-ufacturing method,it offers many advantages from the manufac-turing perspective and has attracted more and more current re-search interests in fabricating the workhorse titanium alloy Ti-6Al-4 V[1].Since the high cooling rate of the molten pool and complicated thermal cycle will result in a fine and metastableαmicrostructure,generally,post-process is required to optimize the microstructure for the widespread application need.Hot iso-static pressing(HIP)and traditional heat treatment are the main post-treatments for the SLM-built Ti-6Al-4 V component[2].How-ever,HIP is a high-cost process and most heat treatments could not achieve a microstructure with high strength-ductility synergy and thermostability,e.g.,sub-transus water quenched microstruc-ture showed superior mechanical properties,but the martensite is far from thermodynamic equilibrium;the sup-transus air cooled microstructure has high thermostability but exhibits low elonga-tion[3,4].

关 键 词：MICROSTRUCTURE ALLOY MARTENSITE 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG665[金属学及工艺—金属材料]