Thermal aging evaluation of cast austenitic stainless steel for the primary loop pipe in nuclear power plants

WANG Yu; LIU Jiangnan; WANG Zhengpin; JIN Yaohua; CAO Nan; YAO Yuhong

doi:10.19666/j.rlfd.201801059

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Thermal aging evaluation of cast austenitic stainless steel for the primary loop pipe in nuclear power plants

Thermal Power Generation Vol. 47, Issue 7, Pages: 64-68(2018)

更新时间：2025-09-28

- Thermal aging evaluation of cast austenitic stainless steel for the primary loop pipe in nuclear power plants
- 作者机构：
  
  西安工业大学材料与化工学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201801059
  CLC： TG142.71
- Published Online：04 July 2018，
  
  Published：2018
- 稿件说明：
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WANG Yu, LIU Jiangnan, WANG Zhengpin, et al. Thermal aging evaluation of cast austenitic stainless steel for the primary loop pipe in nuclear power plants[J]. Thermal Power Generation, 2018, 47(7): 64-68.
DOI：

WANG Yu, LIU Jiangnan, WANG Zhengpin, et al. Thermal aging evaluation of cast austenitic stainless steel for the primary loop pipe in nuclear power plants[J]. Thermal Power Generation, 2018, 47(7): 64-68. DOI： 10.19666/j.rlfd.201801059.

摘要

压水堆核电站中的一回路主冷却剂管道用铸造奥氏体不锈钢(CASS)长期在反应堆环境下服役

面临热老化脆化问题。本文利用时效参数外延法

对其主要用钢Z3CN20-09M钢在长期运行后的热老化脆化程度进行评估

并对材料的使用寿命进行预测。评估结果表明:在时效参数P=3.48的时效状态下

Z3CN20-09M钢中的铁素体发生了调幅分解

产生了热老化脆化倾向;同时

拟合得出该材料在288~327℃服役后的总冲击能量随时效参数P的变化关系

预测冷热腿管道用Z3CN20-09M钢在接近延寿期60满功率运行年限服役是安全的。

Abstract

Cast austenitic stainless steel(CASS) used in main coolant pipes of the primary loop in pressurized-water reactor(PWR) nuclear power plants faces the problem of thermal aging embrittlement after long-time operation in the reactor environment. In this study

the aging parameter extrapolation method is used to evaluate the degree of thermal aging embrittlement and predict the service life of the mainly used Z3CN20-09 M steel after long-time operation. The evaluation results indicate that

when the aging parameter P is 3.48

the spinodal decomposition takes place on the ferrite of Z3CN20-09 M steels

which results in a thermal aging embrittlement tendency. In the meantime

the relationship between the total impact energy and aging parameter P of the Z3CN20-09 M steel after service at 288 ℃ to 327 ℃ is obtained by fitting. It is predicted that the Z3CN20-09 M steels used for the cold and hot leg pipe is safe when its extending service life is close to 60 effective full power years.

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