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Effect of Heat Treatment Process on Recrystallization of Directional-Solidified Superalloy 4777DS
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Qiongyuan Zhang1, 2, 4, Ziyue Zhang3, Atao Yang1, 4, Mengxue Lv3, Qungong He1, 4, Zhihao Yao3, Haiyang Wang1, 4, Jianxin Dong3
Rare Metal Materials and Engineering | 2026, 55(7) : 1833 - 1839
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Rare Metal Materials and Engineering | 2026, 55(7): 1833-1839
Effect of Heat Treatment Process on Recrystallization of Directional-Solidified Superalloy 4777DS
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Qiongyuan Zhang1, 2, 4, Ziyue Zhang3, Atao Yang1, 4, Mengxue Lv3, Qungong He1, 4, Zhihao Yao3, Haiyang Wang1, 4, Jianxin Dong3
Affiliations
  • 1.State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment, Deyang 618000, China
  • 2.School of Materials Sciences and Engineering, Tsinghua University, Beijing 100084, China
  • 3.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 4.Dongfang Electric Corporation Dongfang Turbine Co., Ltd, Deyang 618000, China
Published: 2026-07-10 doi: 10.12442/j.issn.1002-185X.20250141
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The effects of different heat treatment processes, alloy states, and stress relief annealing processes on recrystallization defects in 4777DS superalloy were studied using SEM and EBSD. SEM observation shows that the γ' phase near the surface of the sandblasted sample undergoes deformation, changing from an initial butterfly shape to a long strip distribution on the alloy surface. The observation of recrystallization of the alloy after insulation at different heat treatment temperatures shows that the temperature at which recrystallization occurs is 1055 ℃. When the heat treatment temperature is higher than the dissolution temperature of the γ' phase, recrystallization presents an equiaxed morphology, while when the heat treatment temperature is lower than the dissolution temperature of the γ' phase, it presents a cellular recrystallization morphology. With the prolongation of heat treatment time, the proportion of large angle grain boundaries decreases, and the resulting annealing twins help to reduce distortion energy. A comparison of recrystallization behavior under different initial alloy states reveals that the as-cast alloy exhibits the highest tendency for recrystallization. In line with practical engineering requirements, a shorter annealing time can effectively reduce the recrystallization degree of alloys.

directional solidification  /  superalloy  /  recrystallization  /  heat treatment  /  alloy state
Qiongyuan Zhang, Ziyue Zhang, Atao Yang, Mengxue Lv, Qungong He, Zhihao Yao, Haiyang Wang, Jianxin Dong. Effect of Heat Treatment Process on Recrystallization of Directional-Solidified Superalloy 4777DS[J]. Rare Metal Materials and Engineering, 2026 , 55 (7) : 1833 -1839 . DOI: 10.12442/j.issn.1002-185X.20250141
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Article Info
doi: 10.12442/j.issn.1002-185X.20250141
  • Receive Date：2025-07-10
  • Online Date：2026-07-29
  • Published：2026-07-10
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  • Received：2025-07-10
Funding
Affiliations
    1.State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment, Deyang 618000, China
    2.School of Materials Sciences and Engineering, Tsinghua University, Beijing 100084, China
    3.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
    4.Dongfang Electric Corporation Dongfang Turbine Co., Ltd, Deyang 618000, China

Corresponding:

Yao Zhihao, Ph. D., Professor, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China, Tel: 0086-10-62332884, 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
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Percentage of
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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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