Creep Damage Estimation based on the Softening Behavior of 10Cr-1Mo-1W-VNbN Steel
Creep Damage Estimation based on the Softening Behavior of 10Cr-1Mo-1W-VNbN Steel
复制标题
基于10Cr-1Mo-1W-VNbN钢软化行为的蠕变损伤估计
DOI：
10.2355/tetsutohagane1955.89.6_699
复制
发表时间：
2003
影响因子：
0.3
通讯作者：
Kiyoshi Saito
中科院分区：
文献类型：
--
作者：
R. Ishii;Y. Tsuda;K. Fujiyama;K. Kimura;Kiyoshi Saito
简介：本文对10 Cr-1 Mo-1 W-VNbN钢在不同条件下的时效、蠕变和蠕变中断试验中的显微组织进行了观察。马氏体板条结构在高温暴露过程中崩溃，无论应力。通过测量板条宽度对板条结构进行定量分析。平均板条宽度随时间增加，其增加趋势与蠕变应变和软化相对应。基于位错结构动力学设计了软化的理论公式。该公式给出了蠕变应力与温度、时间和硬度之间的定量关系。用该公式估算了任意给定条件下的蠕变损伤，其估算结果与任意蠕变时间分数t/tr下的硬度实验值吻合较好。
Synopsis : Microstructural observations were carried out on 10Cr-1Mo-1W-VNbN steels artificially deteriorated by ageing, creep and creep interrupted tests under various conditions. Martensitic lath structure was collapsed during high temperature exposure regardless of stress. The quantitative analysis of lath structure was performed by measuring lath width. The mean lath width increased with time and the increasing trend corresponded to both the creep strain and softening. The theoretical formulation of the softening was designed based on the kinetics of the dislocation structure. The formula gave quantitative correlation among the creep stress, temperature, time and hardness. The creep damage at any given condition was estimated by this formula, and the estimated result was in good agreement with the experimental value of the hardness at any creep time fraction t/tr.