Microstructure and mechanical properties of Ti‐6Al‐4V produced by electron beam melting of pre‐alloyed powders

冶金 选择性激光熔化 钛合金 扫描电子显微镜 相(物质) 压痕硬度
作者
Luca Facchini,Emanuele Magalini,Pierfrancesco Robotti,Alberto Molinari
出处
期刊:Rapid Prototyping Journal [Emerald (MCB UP)]
卷期号:15 (3): 171-178 被引量:206
标识
DOI:10.1108/13552540910960262
摘要

Purpose – The purpose of this paper is the microstructural and mechanical characterization of a biomedical Ti‐6Al‐4V alloy produced by electron beam melting, and the study of the stability of the as‐built microstructure upon heat treatment.Design/methodology/approach – Ti‐6Al‐4V alloy produced by electron beam melting has been mechanically characterized through tensile and fatigue testing. Its microstructure has been investigated by optical observation after etching and by X‐ray diffractometry analysis. The stability of the microstructure of the as‐built material has been deepened carrying out suitable heat treatments, after an analysis by dilatometry test.Findings – The microstructure of a Ti‐6Al‐4V alloy produced by electron beam melting has a very fine and acicular morphology, because of the intrinsically high‐solidification rate of the process. This microstructure is very stable, and the traditional thermal treatments cannot modify it; the microstructure changes significantly only when an amount of st...

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