Effect of heat treatment on microstructure and mechanical properties of selective laser melting GH4169 alloy at 650 ℃: in-situ SEM investigation

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Effect of heat treatment on microstructure and mechanical properties of selective laser melting GH4169 alloy at 650 ℃: in-situ SEM investigation

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ZHU Jiamian / LYU Guosen / JIANG Wenxiang / CHENG Xiaopeng / JIA Zeyi / LYU Junxia / HUANG Shuai / ZHANG Xuejun

The effect of heat treatment on the microstructure and high temperature mechanical properties of SLM GH4169 alloy was studied by using a self-developed in-situ high temperature tensile device. The results show that the grain morphology of as-built alloy changes from columnar crystal to equiaxed crystal after homogenization+solid solution+aging treatment （HSA）， coupling with Laves phase dissolution， and a large amount of γ′ and γ″ strengthening phase precipitates. At 650 ℃， the yield strength and tensile strength of the as-built sample are 574 MPa and 740 MPa， while the yield strength and tensile strength of HSA sample are 818 MPa and 892 MPa respectively， which are 42.5% and 20.1% higher than that of the deposited alloy. The deformation process can be further characterized by in-situ tensile testing. The surface grain undulation of the as-built sample gets larger， the coordinated deformation ability becomes stronger， and the plastic flow ability gets better.The cracks in the as-built sample are originated around the Laves phase， spreading along the dendrite towards the maximum shear stress， and shear fracture occurs after necking of the sample. In HSA samples， the cracks are initiated around carbides and propagating along the grain boundaries. The fracture mode is a mixed type， involving both intergranular and transgranular fractures.

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Title :

Effect of heat treatment on microstructure and mechanical properties of selective laser melting GH4169 alloy at 650 ℃: in-situ SEM investigation

Contributors:

ZHU Jiamian (author) / LYU Guosen (author) / JIANG Wenxiang (author) / CHENG Xiaopeng (author) / JIA Zeyi (author) / LYU Junxia (author) / HUANG Shuai (author) / ZHANG Xuejun (author)

Published in:

Journal of Aeronautical Materials, Vol 44, Iss 1, Pp 93-103 (2024)

Publication date :

2024

ISSN :

1005-5053

DOI :

https://doi.org/10.11868/j.issn.1005-5053.2023.000066

Type of media :

Article (Journal)

Type of material :

Electronic Resource