Effects of Heat Treatment on Microstructure and Tensile Properties of Laser Additive Manufactured In718/316L Functionally Gradient Material

doi:10.3901/JME.2022.19.293

Abstract

Abstract: The effects of solution double aging heat treatment at solution temperatures of the 1 080 ℃ (HT1) and 980 ℃ (HT1) on the microstructure of laser directed energy deposited (LDEDed) In718/316L functionally gradient material (FGM) is investigated to reveal the mechanism of heat treatment-induced microstructure evolution on the microhardness and tensile properties of In718/316L FGM. The results show that the microstructure of In718/316L FGM changes from equiaxed grain to columnar grain in building direction with the increase of In718 powder content. After the solution double aging heat treatment, the ferrite content of In718/316L FGM is reduced, and a large amount of γ′, γ″, and δ phases are precipitated in the region closed to 100 vol% In718. The grains of the HT2 specimen are smaller than those of the HT1 specimen. With the increase of In718 powder content, the microhardness of In718/316L FGM is decreased firstly and then increased. After heat treatment, the microhardness, strength and the plasticity of In718/316L FGM are significantly improved with the precipitation of the enhanced γ′and γ″phase. The specimens before and after heat treatment are mainly by ductile fracture, but the ductile characteristics are more significant after heat treatment. In contrast, the strength and plastic matching of In718/316L FGM was more superior after HT2 heat treatment.

Key words: laser directed energy deposition, In718/316L, functionally gradient material, heat treatment, tensile property, microstructure

CLC Number:

TG156

WU Runbao, XU Gang, LUO Kaiyu, WANG Changyu, LU Jinzhong. Effects of Heat Treatment on Microstructure and Tensile Properties of Laser Additive Manufactured In718/316L Functionally Gradient Material[J]. Journal of Mechanical Engineering, 2022, 58(19): 293-305.

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