文献类型：期刊文献

英文题名：Ratchetting behavior of advanced 9-12% chromium ferrite steel under creep-fatigue loadings: Fracture modes and dislocation patterns

作者：Zhao, Peng[1];Xuan, Fu-Zhen[1]

机构：[1]E China Univ Sci & Technol, Key Lab Pressure Syst & Safety, MOE, Sch Mech Engn, Shanghai 200237, Peoples R China

年份：2012

卷号：539

起止页码：301

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

收录：;EI(收录号：20120914827536);WOS:【SCI-EXPANDED(收录号:WOS:000302047300040)】；

基金：This work was financially supported by National Natural Science Foundations of China (50835003,10972078 and 51005076) and Natural Science Foundation of Shanghai (11JC1403200).

语种：英文

外文关键词：Ratchetting; Creep-fatigue loading; Internal stress

摘要：In order to reveal the physical mechanisms of ratchetting process under creep-fatigue loadings, following ratchetting tests in advanced 9-12% chromium ferrite steel, a study of associated fracture modes and dislocation patterns explored by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations is presented in this paper. Two main domains were observed depending both on the peak hold time and on the stress ratio, in which the ratchetting deformation and failure mechanisms were different. These two damage domains correspond to two distinct creep-ratchetting interaction mechanisms. Particular attention was paid to the dependence of ratchetting damage behavior on the stability of dislocation substructure. In addition, an attempt is made to correlate the results of the microstructural investigations with the variations of internal stress. (C) 2012 Elsevier B.V. All rights reserved.