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| Research Progress in Defect and Microstructure of As-Built Selective Laser Melting Ti–6Al–4V Titanium Alloy |
| LI Chen1 , MI Guangbao2 , FENG Aihan1 , HUANG Xu2 , QU Shoujiang1 |
| （1. School of Materials Science and Engineering, Tongji University, Shanghai 200092, China; 2. Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China） |
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Abstract 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 the β→α phase 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.
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2021, 
