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Microstructure Regulation Mechanisms and Intermediate Temperature Mechanical Behavior of GH4698 Alloy
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Qianmin Zhao1, 2, Xinbao Zhao1, 2, Jufeng Jin1, 2, Zheshuai Zheng1, Quanzhao Yue1, Wanshun Xia1, Pei Li3, Yuefeng Gu1, Ze Zhang1
Rare Metal Materials and Engineering | 2026, 55(7) : 1823 - 1832
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Rare Metal Materials and Engineering | 2026, 55(7): 1823-1832
Microstructure Regulation Mechanisms and Intermediate Temperature Mechanical Behavior of GH4698 Alloy
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Qianmin Zhao1, 2, Xinbao Zhao1, 2, Jufeng Jin1, 2, Zheshuai Zheng1, Quanzhao Yue1, Wanshun Xia1, Pei Li3, Yuefeng Gu1, Ze Zhang1
Affiliations
  • 1.School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
  • 2.Polytechnic Institute, Zhejiang University, Hangzhou 310015, China
  • 3.Xi'an Thermal Power Research Institute Co., Ltd, Xi'an 710054, China
Published: 2026-07-10 doi: 10.12442/j.issn.1002-185X.20250137
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Diverse heat treatment schedules were designed and their effects on microstructural evolution and tensile properties at 750 ℃ were investigated by SEM, EDS, TEM, and mechanical testing. The results demonstrate that multi-stage heat treatment schedules lead to a multi-modal size distribution of γ' precipitates within the alloy, where fine γ' precipitates contribute to strength, while coarse γ' phases enhance ductility. At 750 ℃, the alloy subjected to the heat treatment of 1030 ℃/4 h, AC+1000 ℃/4 h, AC+875 ℃/16 h, AC+725 ℃/16 h, AC develops a trimodal γ' phase distribution. This microstructure balances the strength between intragranular and grain boundary regions, facilitating the transfer of dislocation slip and enhancing the ductility of the alloy. The alloy exhibits the best overall mechanical properties, with a tensile strength of 706 MPa and an elongation after fracture of 9.3%.

nickel-based wrought superalloys  /  aging heat treatment  /  microstructure  /  tensile property
Qianmin Zhao, Xinbao Zhao, Jufeng Jin, Zheshuai Zheng, Quanzhao Yue, Wanshun Xia, Pei Li, Yuefeng Gu, Ze Zhang. Microstructure Regulation Mechanisms and Intermediate Temperature Mechanical Behavior of GH4698 Alloy[J]. Rare Metal Materials and Engineering, 2026 , 55 (7) : 1823 -1832 . DOI: 10.12442/j.issn.1002-185X.20250137
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Article Info
doi: 10.12442/j.issn.1002-185X.20250137
  • Receive Date：2025-07-15
  • Online Date：2026-07-29
  • Published：2026-07-10
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  • Received：2025-07-15
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Affiliations
    1.School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
    2.Polytechnic Institute, Zhejiang University, Hangzhou 310015, China
    3.Xi'an Thermal Power Research Institute Co., Ltd, Xi'an 710054, China

Corresponding:

Zhao Xinbao, Ph. D., Professor, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China, Tel: 0086-571-64219632, E-mail:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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