文献类型：期刊文献

英文题名：Effect of microstructure on fatigue crack propagation behavior in a steam turbine rotor steel

作者：Zhu, Ming-Liang[1];Xuan, Fu-Zhen[1];Wang, Guo-Zhen[1]

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

年份：2009

卷号：515

期号：1-2

起止页码：85

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

收录：;EI(收录号：20091912075969);WOS:【SCI-EXPANDED(收录号:WOS:000266854500014)】；

基金：The authors are grateful for the supports provided by The National High Technology Research and Development Program of China (2006AA04Z413). F.Z. would also wish to thank the supports provided by Fok Ying Tung Education Foundation (101054) and Program for New Century Excellent Talents in University (NCET-06-0414).

语种：英文

外文关键词：Fatigue; Crack growth path; Microstructure

摘要：Fatigue crack growth behavior was investigated in a newly developed steel 25Cr2NiMo1V with different hear treatments to meet different property requirements of high-pressure (HP) and low-pressure (LP) parts in the combined steam turbine rotor. The load-shedding method and constant load amplitude techniques were adopted. Fractography including crack surface observation and fatigue crack growth path analyses was carried out. Results show that in the threshold regime, fatigue crack growth resistance of HP is clearly superior to that of LP. The distributed bainitic microstructures and larger prior austenite grain size in HP result in more tortuous crack propagation path than that in LP. Compared with ferritic blocks in HP, the tempered martensitic laths in LP do not play a dominant role in stopping the fatigue crack advance. Nevertheless, no clear difference in fatigue crack growth in HP and LP is observed in the Paris regime. (C) 2009 Elsevier B.V. All rights reserved.