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| Effects of Subsequent Heat Treatment on Microstructure and High-Temperature Mechanical Properties of Laser 3D Printed GH4099 Alloy |
ZHAO Yanan, GUO Qianying, LIU Chenxi, MA Zongqing( ), LIU Yongchang |
| School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China |
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Cite this article:
ZHAO Yanan, GUO Qianying, LIU Chenxi, MA Zongqing, LIU Yongchang. Effects of Subsequent Heat Treatment on Microstructure and High-Temperature Mechanical Properties of Laser 3D Printed GH4099 Alloy. Acta Metall Sin, 2025, 61(1): 165-176.
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Abstract The multi-dimensional, multi-scale forming characteristics of laser powder bed fusion (LPBF) 3D printing technology, combined with its complex non-equilibrium solidification process, result in multilayered microstructures that differ significantly from those produced by traditional manufacturing methods. However, it is challenging to apply existing heat treatment solutions, developed for conventional manufacturing processes, to LPBF. Therefore, a tailored heat treatment approach is required for LPBF-printed components to regulate their microstructure and properties effectively. This study investigated the modulation mechanism of subsequent heat treatment on the non-equilibrium microstructure and high-temperature mechanical properties of 3D-printed GH4099 superalloy produced via LPBF. The findings reveal that solution treatment influences the recrystallization behavior of the printed microstructure and the precipitation behavior of carbides and γ' phases, which play critical roles in determining the alloy's high-temperature elongation. The multi-scale heterogeneous structure in the LPBF-fabricated GH4099 alloy enhances its microstructural thermal stability beyond that of conventional castings and forgings. Consequently, a high solution heat treatment temperature is necessary to achieve complete recrystallization. Following solution treatment at 1150 oC for 1.5 h, the columnar grains in the GH4099 prints were transformed into equiaxed grains, and large size twins were formed. Additionally, the precipitation of M23C6 carbides at the grain boundaries was suppressed. During subsequent aging heat treatment, the recrystallization induced by the solution treatment mitigated the distortion energy stored in the 3D-printed grains, thereby suppressing γ' phase precipitation in the matrix. As a result, by optimizing the heat treatment process, a favorable balance between high-temperature strength and plasticity was achieved in the GH4099 alloy.
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Received: 17 June 2024
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| Fund: National Natural Science Foundation of China(U22A20172);National Natural Science Foundation of China(52122409);National Key Research and Development Program of China(2023YFB3712002) |
Corresponding Authors:
MA Zongqing, professor, Tel: 13702124121, E-mail: zqma@tju.edu.cn
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