800H合金“异常”蠕变行为及影响研究

王庆武; 李旭; 王苗苗; 刘协文; 吕典; 詹英杰; 魏文斌; 杨鹏; 朱武军; 赵鹏; 项延训

doi:10.19666/j.rlfd.202508049

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800H合金“异常”蠕变行为及影响研究

Thermal Power Generation Vol. 55, Issue 4, Pages: 183-190(2026)

更新时间：2026-06-12

- 800H合金“异常”蠕变行为及影响研究
- 作者机构：
  
  1. 华能核能技术研究院有限公司
  2. 四川大学原子核科学技术研究所辐射物理及技术教育部重点实验室
  3. 华东理工大学机械与动力工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202508049
  CLC： TG132.3;TM623
- Published：2026
- 稿件说明：
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[1]王庆武,李旭,王苗苗,等.800H合金“异常”蠕变行为及影响研究[J].热力发电,2026,55(04):183-190.
[1]王庆武,李旭,王苗苗,等.800H合金“异常”蠕变行为及影响研究[J].热力发电,2026,55(04):183-190. DOI： 10.19666/j.rlfd.202508049.

DOI：10.19666/j.rlfd.202508049.

摘要

800H合金是高温气冷堆蒸汽发生器主蒸汽联箱的关键材料，在高温高压的长期服役条件下易发生蠕变损伤与失效。通过在不同温度与应力条件下进行800H合金的拉伸与蠕变试验，系统获取了其力学性能参数及蠕变曲线。结果表明，该合金在蠕变初期存在蠕变速率先减小后增大的“异常”行为，且该现象在低应力条件下更明显。通过Monkman-Grant关系与应力指数法，确定了考虑“异常”蠕变行为后的真实稳态蠕变速率。进一步研究发现，该“异常”蠕变行为显著降低了蠕变速率，并影响后续蠕变过程。通过定量分析发现，异常点蠕变速率随温度升高和应力增大而升高，异常持续时间占比则随应力增大而增加。研究结果为深入理解800H合金的蠕变行为与强化机理提供了重要依据。

Abstract

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.

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references

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