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Effect of Heat Treatment on Microstructure and Properties of FGH4096M Superalloy Processed by Selective Laser Melting

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Abstract

A self-designed nickel-based superalloy, designated as FGH4096M, was prepared by selective laser melting (SLM). Different heat treatments were performed to improve the mechanical properties of the SLM alloy through optimizing the microstructures and the features of γ′ precipitates. Compared with the as-deposited alloy, the columnar grains with dendritic structures and equiaxed structures were retained in the alloy after direct aging, but a large amount of tertiary γ′ phase precipitated, especially around the sub-grain boundaries, resulting in the highest tensile strength but the lowest elongation. During solid solution and aging treatment (SSA), the recovery and recrystallization occurring in the alloy facilitated the grains to be equiaxed with the increase of solution temperature. For lower solution temperature (below 1100 ℃), the secondary γ′ precipitates decreased with the increase of solution temperature, while the tertiary γ′ precipitates from the subsequent aging process gradually increased; for higher solution temperature over 1100 ℃, exceeding the complete dissolution temperature of the γ′ phase, only tertiary γ′ precipitates from the subsequent aging process were uniformly distributed in the alloy. After double solid solution (1170 ℃ + 1050 ℃) + aging heat treatment (DSSA), there were three sizes of γ′ precipitates in the alloy. In general, the SLM + SSA (1130 ℃) alloy obtained the best comprehensive properties, which could be related to the homogenized microstructures and the uniform and dense distribution of single sized tertiary γ′ precipitates in the alloy.

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Acknowledgements

The authors thank the Director Zhang Guo-Wei and Zhang Guo-Dong of Hangxing Lihuan Technology Co., Ltd, and the Director Ye Jun-Qing of Guizhou Anda Aviation Forging Co., Ltd for their valuable contributions. The work was supported by Shenzhen Science and Technology Innovation Commission under projects (No. JSGG20180508152608855 and No. JCYJ20170817110358927).

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing (USTB), Beijing, 100083, China

    Zhibo Hao, Tian Tian, Shiqing Peng & Changchun Ge

  2. Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China

    Xinggang Li

  3. Department of Mechanical and Energy Engineering, Southern University of Science and Technology (SUSTech), Shenzhen, 518055, China

    Xinggang Li, Chuan Guo & Qiang Zhu

  4. Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials (BIAM), Beijing, 100095, China

    Chonglin Jia

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  1. Zhibo Hao
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  2. Tian Tian
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  4. Changchun Ge
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Correspondence to Changchun Ge or Xinggang Li.

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Hao, Z., Tian, T., Peng, S. et al. Effect of Heat Treatment on Microstructure and Properties of FGH4096M Superalloy Processed by Selective Laser Melting. Met. Mater. Int. 26, 1270–1285 (2020). https://doi.org/10.1007/s12540-019-00467-0

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