文献类型：期刊文献

英文题名：Stress state dependent creep damage behavior of 9-12% Cr steel notched components

作者：Niu, Tian-Ye[1];Zhao, Peng[1];Zhu, Gang[1];Gong, Jian-Guo[1];Xuan, Fu-Zhen[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2021

卷号：804

外文期刊名：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录：;EI(收录号：20210509858574);WOS:【SCI-EXPANDED(收录号:WOS:000615991400003)】；

基金：Supports from Natural Science Foundation of China (Grant Nos.: 51605165 and 51835503) are greatly acknowledged.

语种：英文

外文关键词：Creep; Stress state; Precipitate; Substructure; Stress tri-axiality; Equivalent stress; Hardness

摘要：Creep damage is governed by different microstructural features (e.g. precipitate coarsening, substructure growth, cavity/crack nucleation and growth) during long term high temperature exposure in 9-12%Cr steels. The dependences of stress states (e.g. equivalent stress and stress tri-axiality) on these damage mechanisms are clarified in this work. Various stress states are produced in FB2 steel notched components with different root radii for creep tests at 605 degrees C. Results indicate that equivalent stress and stress tri-axiality present different influences on creep damage behavior of notched components at elevated temperatures. The equivalent stress and stress triaxiality both enhance the precipitation of the carbide, indicating larger mean diameter and higher area of the precipitates. Meanwhile, the equivalent stress plays a more significant role on the coarsening of the substructure of the material than the stress tri-axiality. Creep cavities are mainly found at several hundred micrometers away from the notch mot, which seems to be induced by the combining action of equivalent stress and stress triaxiality. These microstructural degradation can be proved by the distribution of the hardness in the notch region of component accompanied by the variation of stress states.