Comparison of the microstructures and mechanical properties of Ti-6Al-4V fabricated by selective laser melting and electron beam melting
Comparison of the microstructures and mechanical properties of Ti-6Al-4V fabricated by selective laser melting and electron beam melting
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选区激光熔化与电子束熔化Ti-6Al-4V的显微组织和力学性能比较
DOI：
10.1016/j.matdes.2015.12.135
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发表时间：
2016-04-05
影响因子：
8.4
通讯作者：
Murr, Lawrence E.
中科院分区：
文献类型：
--
作者：
Zhao, Xiaoli;Li, Shujun;Murr, Lawrence E.
比较了SLM和EBM Ti-6Al-4V试样的显微组织和力学性能。阐述了零件尺寸和取向对缺陷、显微组织的影响及其对拉伸和疲劳性能的贡献。所制备的SLM和EBM样品分别主要由α '和α + β相组成。气孔是SLM和EBM样品的主要缺陷，与扫描策略和能量输入密切相关。SLM样品的孔隙率高于EBM样品。零件尺寸对EBM试样的显微组织和力学性能有明显的影响，但对SLM试样的影响较小。SLM和EBM试样在垂直方向上的强度和塑性均高于水平方向。SLM样品的拉伸强度显著大于EBM样品，而延展性低得多。由于试样中含有孔隙，EBM和SLM试样的疲劳强度均低于铸造和退火合金。然而，热等静压（HIP）显着增加SLM和EBM样品的疲劳极限超过550 MPa的孔隙关闭。(C)2015由Elsevier Ltd.出版
The microstructure and mechanical properties of SLM and EBM Ti-6Al-4V samples have been compared. The effect of part size and orientation on the defects, microstructure and their contribution to the tensile and fatigue properties were elucidated. As-fabricated SLM and EBM samples mainly consisted of alpha' and alpha + beta phases, respectively. Pores were the main defects in SLM and EBM samples, and closely related to scanning strategies and energy input. The porosity of SLM samples was higher compared to EBM samples. The part size had an obvious influence on the microstructure and mechanical properties of EBM samples but less so for SLM samples. Both SLM and EBM samples possessed higher strength and better ductility in the vertical orientation than those in the horizontal orientation. The tensile strength of SLM samples was significantly greater than that of EBM samples whereas the ductility was much lower. Due to the pores contained in samples, fatigue strength of both EBM and SLM samples was lower than those of cast and annealed alloys. However, hot isostatic pressing (HIP) significantly increased the fatigue limits of both SLM and EBM samples to above 550 MPa by closing of the pores. (C) 2015 Published by Elsevier Ltd.