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Study on anomalous creep behavior of 800H alloy and its influence
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Qingwu WANG1, Xu LI1, 2, Miaomiao WANG1, Xiewen LIU3, Dian LYU3, Yingjie ZHAN1, Wenbin WEI1, Peng YANG1, Wujun ZHU3, Peng ZHAO3, Yanxun XIANG3
Thermal Power Generation | 2026, 55(4) : 183 - 190
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Thermal Power Generation | 2026, 55(4): 183-190
• Power generation techonology forum •
Study on anomalous creep behavior of 800H alloy and its influence
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Qingwu WANG1, Xu LI1, 2, Miaomiao WANG1, Xiewen LIU3, Dian LYU3, Yingjie ZHAN1, Wenbin WEI1, Peng YANG1, Wujun ZHU3, Peng ZHAO3, Yanxun XIANG3
Affiliations
  • 1.Huaneng Nuclear Energy Technology Research Institute Co., Ltd., Shanghai 200126, China
  • 2.Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
  • 3.College of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
Published: 2026-04-25 doi: 10.19666/j.rlfd.202508049
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The 800H alloy is a critical high-temperature material used for the main steam header of high-temperature gas-cooled reactor steam generators and is prone to creep damage and failure under prolonged high-temperature and high-pressure service conditions. In this study, tensile and creep tests were systematically performed on 800H alloy under various temperatures and stress levels to obtain its mechanical properties and detailed creep curves. The results indicate that the alloy exhibits an anomalous creep behavior in the early stage of creep, characterized by an initial decrease followed by an increase in creep rate, which is more pronounced under lower stress conditions. The true steady-state creep rate, accounting for this anomalous behavior, was determined using the Monkman-Grant relationship in combination with stress exponent analysis. Further investigation shows that this anomalous creep behavior significantly reduces the creep rate and influences the subsequent creep process. Quantitative analysis reveals that the creep rate at the anomalous point increases with increasing temperature and stress, while the duration of the anomalous stage increases with applied stress. These findings provide valuable insights into the creep behavior and strengthening mechanisms of the 800H alloy.

800H alloy  /  creep rate  /  Monkman-Grant relationship  /  stress exponent
Qingwu WANG, Xu LI, Miaomiao WANG, Xiewen LIU, Dian LYU, Yingjie ZHAN, Wenbin WEI, Peng YANG, Wujun ZHU, Peng ZHAO, Yanxun XIANG. Study on anomalous creep behavior of 800H alloy and its influence[J]. Thermal Power Generation, 2026 , 55 (4) : 183 -190 . DOI: 10.19666/j.rlfd.202508049
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  • National Key Research and Development Program(2022YFB3707204)
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Year 2026 volume 55 Issue 4
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Article Info
doi: 10.19666/j.rlfd.202508049
  • Receive Date：2025-08-21
  • Online Date：2026-08-14
  • Published：2026-04-25
Article Data
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History
  • Received：2025-08-21
  • Revised：2025-10-20
  • Accepted：2025-10-21
Funding
National Key Research and Development Program(2022YFB3707204)
Affiliations
    1.Huaneng Nuclear Energy Technology Research Institute Co., Ltd., Shanghai 200126, China
    2.Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China
    3.College of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
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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
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Genus		 种数
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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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