Effect of Heat Treatment on Comprehensive Properties of Selective Laser Melting Manufacturing 316L Alloy
YANG Lijun1,2, ZHENG Hang1,2, LI Jun1,2, SUI Zehui1,2
1 College of Mechanical & Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China 2 Institute of Bionic Design and Manufacturing of Biomaterials, Shaanxi University of Science and Technology, Xi'an 710021, China
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.
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2021, Vol. 35 
