Influence of heat treatment on microstructure, mechanical and corrosion behavior of WE43 alloy fabricated by laser-beam powder bed fusion
Chenrong Ling, Qiang Li, Zhe Zhang, Youwen Yang, Wenhao Zhou, Wenlong Chen, Zhi Dong, Chunrong Pan, Cijun Shuai
Abstract
Highlights WE43 parts with favorable forming quality are fabricated by laser-beam powder bed fusion and the interaction between laser beam and powder is revealed. After suitable heat treatment, the anisotropic microstructure is eliminated, with nano-scaled Mg 24 Y 5 particles homogeneously precipitated. The yield strength and ultimate tensile strength are improved to (250.2 ± 3.5) MPa and (312 ± 3.7) MPa, respectively, while the elongation still maintains at high level of 15.2%. Homogenized microstructure inhibits the micro galvanic corrosion and promotes the development of passivation film, thus decreasing the degradation rate by an order of magnitude. The porous WE43 scaffolds offer a favorable environment for cell growth.