Effect of heat treatment routes on microstructure and mechanical properties of JBK-75 alloy fabricated by laser melting deposition

doi:10.13251/j.issn.0254-6051.2023.04.018

Abstract

Abstract: Fe-Ni based JBK-75 alloy was fabricated by laser melting deposition, then direct aging at 750 ℃ and 1180 ℃ high-temperature solution treatment+aging at 750 ℃ were selected to be the heat treatment routes. The microstructure of the as-deposited JBK-75 alloy was analyzed, and the microstructure and mechanical properties of the two different heat treatment states were compared. The results show that the microstructure of the as-deposited JBK-75 alloy is anisotropic, with columnar crystal, cellular structure and Ti segregation. The two different heat treatment routes show little effect on the precipitation behavior of the strengthening phase (γ′ phase), while in the direct aged specimen the segregation of Ti element promotes the formation of harmful phase (η phase) at grain boundaries. After the high-temperature solution and aging treatment, the laser melting deposited JBK-75 alloy obtains fine and uniform γ grains and avoids the grain boundary η phase, and exhibits the best mechanical properties, with the tensile strength of 1055 MPa, yield strength of 679 MPa and elongation of 29%, which reaches the level of mechanical properties of the forged JBK-75 alloy after heat treatment.

Key words: laser melting deposition, JBK-75 alloy, element segregation, precipitation, solution-aging treatment

CLC Number:

TG142.25

Li Jina, Su Jie, Liu Geng, Wang Ao, Yi Yong. Effect of heat treatment routes on microstructure and mechanical properties of JBK-75 alloy fabricated by laser melting deposition[J]. Heat Treatment of Metals, 2023, 48(4): 111-117.

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