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Microstructure Homogenization of GH4169 Superalloy in Shear-Compression Deformation State by Recrystallization Annealing
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Affiliation:

1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;2.Technical Management Department, Jiangsu Yinhuan Precision Steel Tube Co., Ltd, Yixing 214200, China;3.State Key Laboratory of Mechanical Transmission for Advanced Equipment, Chongqing University, Chongqing 400044, China;4.School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China

Fund Project:

State Key Laboratory of Mechanical Transmission for Advanced Equipment Project (SKLMT-MSKFKT-202219); Natural Science Foundation of Jiangsu Province (BK20220548); Open Research Fund from the State Key Lab of Advanced Metals and Materials, University of Science and Technology Beijing (2022-Z21); National Natural Science Foundation of China (52005223)

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    Abstract:

    Regional microstructure characteristic always appears in shear-compression deformed GH4169 superalloy, which is detrimental to subsequent cold-rolling process in engineering. Recrystallization annealing treatments within temperature range of 1000?1080 °C and holding time range of 1?3 h were carried out to investigate the microstructure evolution behavior, and the cold-forming property of GH4169 superalloy was optimized by regulating the grain size. Results show that static recrystallization (SRX) grains are fully nucleated at 1000 °C and the original coarse grains are completely replaced by fine recrystallized grains. Bulges of high angle grain boundaries are the preferred nucleation points of SRX. At 1020?1060 °C, grain annexation takes place among adjacent SRX grains, causing partial grains to increase, while the original dynamic recrystallization (DRX) grains keeps tiny in the strain con-centration region. Recrystallized grains (both SRX and DRX) uniformly grow up, with an average grain size of 87.89 μm at 1080 °C, at which the regional characteristic completely disappears, and the microstructure is significantly homogenized. Step twins appear at 1080 °C due to the SRX growth accidents, and the length fraction of twin boundaries (Σ3) reaches 35.8%, which can effectively improve the high temperature resistance of GH4169 superalloy. Ultimately, the optimal recrystallization annealing of shear-compression deformed GH4169 superalloy is determined as 1080 °C-1 h, followed by water cooling.

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[Chen Leli, Gao Pei, Luo Rui, Cheng Xiaonong, Meng Xiankai. Microstructure Homogenization of GH4169 Superalloy in Shear-Compression Deformation State by Recrystallization Annealing[J]. Rare Metal Materials and Engineering,2024,53(7):1882~1886.]
DOI:10.12442/j. issn.1002-185X. E20230040

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History
  • Received:September 28,2023
  • Revised:January 18,2024
  • Adopted:January 31,2024
  • Online: July 16,2024
  • Published: July 12,2024