激光选区熔化与铸造成形TC4钛合金的力学性能分析

doi:10.11896/cldb.19120021

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Abstract With the help of finite element simulation, optical microscope (OM), scanning electron microscope (SEM), energy spectrum analysis (EDS), and Vickers hardness tester, the microstructure evolution and mechanical properties of TC4 titanium alloy by laser selective mel-ting and cast were studied. The effects of solidification and cooling of liquid metal on its microstructure and mechanics under different forming conditions were analyzed. The results show that laser selective melting and casting were basket structure of the needle-shaped martensite α′ phase and the Wei’s structure of α+β phase. Compared with casting, the laser selective melting TC4 titanium alloy had an extremely fast cooling rate (1.78×10⁷ ℃·s^-1) and a large temperature gradient, with the same element type and obvious crystal orientation. Meanwhile, the tensile strength, yield strength, elongation and hardness of the TC4 specimens formed by SLM were 1 120.83 MPa, 916.31 MPa, 9.5% and 123.04HV, while the tensile strength, yield strength, elongation and hardness of the TC4 specimens formed by casting were 917.67 MPa, 786.23 MPa, 8.0% and 77.876HV, compared with cast, the tensile strength, yield strength, elongation and hardness of TC4 specimens formed by SLM forming increased by 22.14%, 16.54% ,18.75% and 58%. Therefore,laser selective melting had better mechanical performance index.

Key words： laser selective melting investment casting cooling rate microstructure mechanical property

Published: 24 July 2020

CLC number:	TG665
	TG146

Fund:This work was financially supported by the National Natural Science Foundation of China (51875452)

About author:: Xuewen Zong, associate professor, Xi’an University of Science and Technology. He graduated from Xi’an Jiaotong University in July 2008 with a doctorate degree in mechanical engineering. Mainly engaged in the research and development of 3D printing-based rapid casting direction technology, published more than 40 articles in important domestic and foreign journals, and declared more than 30 invention patents.

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	ZONG Xuewen
	LIU Wenjie
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Cite this article:

ZONG Xuewen,LIU Wenjie,ZHANG Jian, et al. Analysis of Mechanical Properties of TC4 Titanium Alloy Formed by Laser Selective Melting and Casting[J]. Materials Reports, 2020, 34(16): 16083-16086.

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http://www.mater-rep.com/EN/10.11896/cldb.19120021 OR http://www.mater-rep.com/EN/Y2020/V34/I16/16083

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