期刊
VACUUM
卷 150, 期 -, 页码 79-83出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2018.01.026
关键词
Selective laser melting; Additive manufacturing; Titanium alloys; Microstructure; Tensile strength
资金
- Project to Strengthen Industrial Development at the Grass-rootslevel [TC160A310/19]
- Natural Science Foundation of Shanghai [17ZR1409200]
- Shanghai Sailing Program [17YF1405400]
- Technology Innovation Program of Shanghai Research Institute of Materials [17SG-14]
Ti6Al4V parts with near-full 98.3% density, significantly refined microstructures and attendant obviously improved mechanical strength were fabricated by SLM additive manufacturing. The cellular prior beta grains were formed on XY plane. However, the columnar morphology of prior beta grains were formed on the XZ and YZ planes, which showed an epitaxial growth along the building direction through successive deposited layers. All the planes displayed the fine acicular alpha' martensites formed due to the significantly rapid cooling rate of melt pool. The reason for forming the intersection angular of 40 degrees-50 degrees between acicular alpha' and beta boundaries was clarified. The improved tensile strength of 1261 MPa and good ductility with elongation of 10.2% were simultaneous obtained for SLM-processed Ti6Al4V part. The present work provides a fundamental understanding of rapid manufacturing of high-strength and light-weight structural materials by laser additive manufacturing. (C) 2018 Elsevier Ltd. All rights reserved.
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