成形态选区激光熔融Ti-6Al-4V钛合金缺陷与微观组织研究进展

Research Progress in Defect and Microstructure of As-Built Selective Laser Melting Ti–6Al–4V Titanium Alloy

选区激光熔融(Selective laser melting,SLM)近年来在钛合金制造领域应用广泛,然而,其性能受限于工艺缺陷和马氏体组织特征。综述了SLM技术下成形态Ti–6Al–4V合金的缺陷和微观组织研究进展,包括缺陷和微观组织类型、调节SLM工艺参数对减少缺陷和改善微观组织的作用以及基于变体选择的β→α相变研究。在综述目前研究的基础上,指出完善工艺参数与组织特征联系以及研究工艺参数对相变变体选择的影响是今后研究的重要方向。

Selective laser melting(SLM)has been widely used in production of titanium alloy parts in recent years,but its performance is limited by process defects and martensite microstructure.The research progress of defects and microstructure of as-built SLM–Ti–6Al–4V was summarized,including defects types and microstructure types,the effect of adjusting process parameters on reducing defect and regulating microstructure,and theβ→αphase transformation research based on variant selection.Based on the main research mentioned above,improving the relationship between process parameters and microstructure characteristics and studing the influence of process parameters on phase transformation variant selection will be the focused directions in the further research.