Creep behavior of a low alloy Mn-Mo-Ni reactor pressure vessel steel received in post weld heat treatment condition has been studied in the temperature range of 600–900 °C. The steel exhibited three stage creep behavior. The steady or secondary creep rates for different stress conditions for a particular temperature were determined using stress change tests. Temperature change tests were conducted to determine the steady state creep rates at different temperatures at a particular stress. The creep rates obtained from different tests were analyzed using the Norton's and Bird-Mukherjee-Dorn creep equations to determine the stress exponent (n) and the creep activation energy (Q). The values of n and Q obtained signify dislocation climb as the underlying creep mechanism in steel. Electron back scatter diffraction (EBSD) study indicated formation of fine subgrain structure in the crept sample.

在 600-900 °C 的温度范围内研究了在焊后热处理条件下收到的低合金 Mn-Mo-Ni 反应堆压力容器钢的蠕变行为。该钢表现出三阶段蠕变行为。使用应力变化测试确定特定温度下不同应力条件的稳定或二次蠕变速率。进行温度变化测试以确定在特定应力下不同温度下的稳态蠕变速率。使用 Norton 和 Bird-Mukherjee-Dorn 蠕变方程分析从不同试验中获得的蠕变速率，以确定应力指数 ( n ) 和蠕变激活能 ( Q )。n和Q的值获得表明位错爬升是钢中潜在的蠕变机制。电子背散射衍射 (EBSD) 研究表明在蠕变样品中形成了细小的亚晶粒结构。