Effect of electropulsing on anisotropy in strength of laser metal deposited Ti-6Al-4V alloy  

电脉冲处理对激光沉积Ti-6Al-4V合金强度各向异性的影响

作　　者：Fu-bin WANG Yu-ke LIU Yun-xiang TONG Chong ZHANG Feng-chun JIANG Jian-dong WANG 王福斌;刘宇珂;佟运祥;张翀;姜风春;王建东(哈尔滨工程大学材料科学与化学工程学院材料加工及智能制造研究所,哈尔滨150001;哈尔滨工程大学材料科学与化学工程学院超轻材料与表面技术教育部重点实验室,哈尔滨150001)

机构地区：[1]Institute of Materials Processing and Intelligent Manufacturing,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China [2]Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,College of Material Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第8期2578-2586,共9页中国有色金属学报（英文版）

基　　金：financial supports from the National Key R&D Program of China (No.2017YFE0123500)。

摘　　要：The effect of electropulsing treatment on microstructure and mechanical strength of laser metal deposited Ti−6Al−4V alloy was investigated in order to eliminate the anisotropy in strength of laser metal deposited Ti−6Al−4V alloy by tensile tests,optical microscopy,scanning electron microscopy,electron back-scattered diffraction analyses and transmission electron microscopy.With increasing applied voltages from 0 to 130 V,the evolution of microstructure within columnarβgrains followed the sequence ofα′martensite→colonyαstructure→basket-weaveαstructure.The electropulsing treated at 130 V weakened the texture of martensite withinβgrains.The as-built Ti−6Al−4V alloy showed an anisotropy in yield strength(6.2%).After processing at 130 V,the anisotropy in yield strength was reduced to 0.6%,which was attributed to the almost equivalent distribution of Schmid factor in the samples deformed along different orientations.为消除激光沉积Ti−6Al−4V合金的强度各向异性,利用拉伸试验、光学显微组织观察、扫描电子显微观察、电子背散射衍射分析和透射电子显微观察研究电脉冲对激光沉积Ti−6Al−4V合金显微组织与强度的影响。结果显示,随着施加电压从0增加到130 V,β柱状晶内的显微组织按如下顺序演化:α′马氏体→集束α组织→网篮α组织。130 V电脉冲处理会弱化β柱状晶内马氏体织构。沉积态Ti−6Al−4V合金表现出约6.2%的屈服强度各向异性;经130 V的电脉冲处理后,屈服强度各向异性减小到0.6%。这主要是由于沿不同方向变形时,130 V电脉冲处理样品表现出近似相同的施密特因子分布。

关 键 词：laser metal deposition Ti-6Al-4V alloy yield strength ANISOTROPY ELECTROPULSING 

分 类 号：TG146.23[一般工业技术—材料科学与工程]