激光选区熔化TA15钛合金显微组织及拉伸性能
Microstructure and Tensile Properties of Selective Laser Melting TA15 Titanium Alloy
摘要: 对激光选区熔化(SLM)成形TA15钛合金显微组织、室温和高温拉伸性能进行了研究，并与TA15钛合金板材进行了对比分析。结果表明，SLM成形TA15钛合金显微组织与板材明显不同，存在连续的、平直的α相晶界，原始的β晶粒没有充分破碎；相比TA15钛合金板材，SLM成形TA15钛合金室温和高温环境下屈服强度、抗拉强度和断后伸长率均有提高；室温拉伸断口SEM照片可观察出残余的TA15钛合金粉末，断口韧窝大部分存在α/β相界。
Abstract:
The microstructure and tensile properties at room temperature and high temperature of SLM TA15 titanium alloy were studied and compared with TA15 titanium alloy plate. The results show that, the microstructure of SLM TA15 titanium alloy where there was a continuous, flat α phase boundary, and the original β grains were not sufficiently broken, is significantly different from TA15 titanium alloy plate. Compared with TA15 titanium alloy plate, SLM TA15 titanium alloy has slightly higher yield strength, tensile strength and elongation after fracture at room temperature and high temperature. The residual TA15 titanium alloy powder was found in SEM photos of tensile fracture at room temperature and most of the fracture dimples had α/β phase boundary.
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