电子束熔化逐层成形法制备Ti-6Al-4V合金的组织与力学性能

来源期刊:中国有色金属学报2013年第z1期

论文作者:王 哲 张 钧 李述军 侯文韬 郝玉琳 杨 锐

文章页码:20 - 24

关键词:电子束熔化;Ti-6Al-4V合金;显微组织;拉伸性能;锻态

Key words:electron beam melting; Ti-6Al-4V alloy; microstructures; mechanical properties; wrought

摘    要:研究电子束熔化逐层成形法(AM-EBM)制备Ti-6Al-4V合金的组织与力学性能,并与锻态Ti-6Al-4V合金进行比较。结果表明:EBM 法制备的Ti-6Al-4V合金的显微组织以α相片层为主,片层之间有少量β相;α相片层厚度随堆积高度的增加而变大,到一定堆积高度后其层片厚度趋于稳定;与锻态合金相比,EBM 法制备的Ti-6Al-4V合金表现出较高的屈服强度和抗拉强度,两种合金均表现出良好的拉伸塑性;EBM Ti-6Al-4V合金的断裂方式为典型的韧窝型穿片层断裂。

Abstract: Microstructures and mechanical properties of Ti-6Al-4V alloy fabricated by electron beam melting (EBM) were investigated and compared to those of wrought Ti-6Al-4V plates. The results indicate that the EBM Ti-6Al-4V alloy mainly consists of α lamellas with small amount of β phase. The thickness of the α lamellas increases with the distance from the building plate and tends to remain stable at the certain building distance. EBM Ti-6Al-4V samples possess higher ultimate tensile strength (UTS) and yield strength (YS) than the wrought Ti-6Al-4V plates. There are no significant differences in ductility between EBM and wrought Ti-6Al-4V alloys. Dimple translamella is observed by SEM on fractured EBM Ti-6Al-4V tensile specimen.

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