核电站一回路奥氏体不锈钢铸件热老化的微观力学性能变化

Microcosmic mechanical properties of thermal aged cast austenite stainless steel in primary circuit in nuclear plant

在核电站一回路中,奥氏体不锈钢铸件(CASS)在运行温度下长期工作除了受到辐照损伤外,还将面临热老化问题。本文对不同时间热老化后的CASS样品进行微观力学性能分析,并结合微观组织中铁素体的含量及分布对CASS的性能变化进行了分析,结果表明微观力学性能的变化和常规的宏观力学性能变化的规律不尽相同。丰富了CASS经老化后的力学性能数据,为CASS的安全运行提供参考。

In primary loop in nuclear plants, under operation temperature will face to the the Cast Austenite Stainless Steel （CASS） issue of thermal aging besides of irradiation damage. The paper describes the analysis of the microcosmic mechanical property of CASS under a series of thermal aging, combined with the fraction and distribution of ferrite phase. The result shows that the regulation of microcosmic mechanical properties is different from that of macroscopic mechanical properties. This work offers more mechanical properties information of CASS which under a series of thermal aging, and gives a reference for the safety of CASS as well.