热处理对激光选区熔化成型316L合金综合性能的影响

doi:10.11896/cldb.20050165

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Abstract In order to obtain excellent mechanical properties, the microstructure and mechanical properties of 316L alloy samples formed by SLM samples after heat treatment at 400 ℃/2 h, 900 ℃/2 h and 1 050 ℃/2 h were studied. The tensile and impact tests were carried out on the samples by tensile tester and impact tester respectively; the hardness difference of 316L alloy under different heat treatment processes was tested by digital hardness tester; the fracture morphology was observed by optical microscope and SEM, and the fracture mechanism was analyzed. The phase change of crystal surface before and after heat treatment was studied by EBSD technology. The results showed that the tensile strength of SLM sample was up to 680 MPa at 900 ℃/2 h water cooling; the highest elongation was 18% under 1 050 ℃/2 h water cooling condition; the hardness increased first and then decreased with the increase of heat treatment temperature. The results showed that the columnar grains were formed along the deposition direction of the untreated SLM samples. With the increase of the heat treatment temperature, the alloy elements were solid solution recombined, forming elliptical grain structure, and the crystal plane orientation difference wss reduced, which was a more uniform isotropic configuration.

Key words： laser selective melting 316L alloy heat treatment process orientation difference of crystal plan

Published: 01 July 2021

CLC number:	ATG14
	TN2

Fund:This work was financially supported by Special Science Research Projects of Shaanxi Provincial Department Education (2020KJRC0008), and District Bureau of Science, Technology and Industrial Informatization of Xi'an(202030).

About author:: Lijun Yang, professor, doctor of engineering, president of College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, mainly engaged in teaching and research of 3D printing and micro nano bionic manufacturing technology. Some research achievements have been made in SLM molding, dental implant design and manufacturing, micro nano bionic design and manufacturing of artificial bone. More than 10 articles have been published in important journals at home and abroad, and more than 6 invention patents have been autho-rized.
Hang Zheng, studying in University of Science and Technology of Shaanxi in September 2018. The master of engineering degree will be obtained in June 2021 from University of Science and Technology of Shaanxi. From March 2019 to now, he has studied in the Institute of Bionic Design and Manufacturing of Biomaterials, Shaanxi University of Science and Technology. He is engaged in laser selective melting 316L molding process and heat treatment research.

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	YANG Lijun
	ZHENG Hang
	LI Jun
	SUI Zehui

Cite this article:

YANG Lijun,ZHENG Hang,LI Jun, et al. Effect of Heat Treatment on Comprehensive Properties of Selective Laser Melting Manufacturing 316L Alloy[J]. Materials Reports, 2021, 35(12): 12103-12109.

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http://www.mater-rep.com/EN/10.11896/cldb.20050165 OR http://www.mater-rep.com/EN/Y2021/V35/I12/12103

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