Pasang Tim, Tavlovich Benny, Yannay Omry, Jackson Ben, Fry Mike, Tao Yuan, Turangi Celine, Wang Jia-Chang, Jiang Cho-Pei, Sato Yuji, Tsukamoto Masahiro, Misiolek Wojciech Z
Department of Manufacturing and Mechanical Engineering and Technology, Oregon Institute of Technology, Klamath Falls, OR 97601, USA.
Metal Technology Center, Rafael Ltd., Haifa 3102102, Israel.
Materials (Basel). 2021 Jun 28;14(13):3603. doi: 10.3390/ma14133603.
An investigation of mechanical properties of Ti6Al4V produced by additive manufacturing (AM) in the as-printed condition have been conducted and compared with wrought alloys. The AM samples were built by Selective Laser Melting (SLM) and Electron Beam Melting (EBM) in 0°, 45° and 90°-relative to horizontal direction. Similarly, the wrought samples were also cut and tested in the same directions relative to the plate rolling direction. The microstructures of the samples were significantly different on all samples. α' martensite was observed on the SLM, acicular α on EBM and combination of both on the wrought alloy. EBM samples had higher surface roughness (Ra) compared with both SLM and wrought alloy. SLM samples were comparatively harder than wrought alloy and EBM. Tensile strength of the wrought alloy was higher in all directions except for 45°, where SLM samples showed higher strength than both EBM and wrought alloy on that direction. The ductility of the wrought alloy was consistently higher than both SLM and EBM indicated by clear necking feature on the wrought alloy samples. Dimples were observed on all fracture surfaces.
对增材制造（AM）制备的Ti6Al4V在打印状态下的力学性能进行了研究，并与锻造合金进行了比较。增材制造样品通过选择性激光熔化（SLM）和电子束熔化（EBM）在相对于水平方向0°、45°和90°的方向上制造。同样，锻造样品也在相对于板材轧制方向的相同方向上进行切割和测试。所有样品的微观结构都有显著差异。在SLM样品上观察到α'马氏体，在EBM样品上观察到针状α，而在锻造合金上则观察到两者的组合。与SLM和锻造合金相比，EBM样品具有更高的表面粗糙度（Ra）。SLM样品比锻造合金和EBM更硬。除了45°方向外，锻造合金在所有方向上的拉伸强度都更高，在该方向上SLM样品的强度高于EBM和锻造合金。锻造合金的延展性始终高于SLM和EBM，这通过锻造合金样品上明显的颈缩特征得以体现。在所有断口表面都观察到了韧窝。
