文献类型：期刊文献

英文题名：Microscale mechanical characterization of deformation properties of 25Cr2NiMo1V after long term service

作者：Li, Sheng[1]; Li, Zhenkai[1]; Yan, Yabin[1]

机构：[1] Key Laboratory of Pressure Systems and Safety Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2022

卷号：12248

外文期刊名：Proceedings of SPIE - The International Society for Optical Engineering

收录：EI(收录号：20223712724983)

语种：英文

外文关键词：Chromium alloys - Chromium steel - Elastic moduli - Molybdenum alloys - Molybdenum steel - Nanotechnology - Steam turbines - Stress-strain curves - Ternary alloys

摘要：Although the performance changes of 25Cr2NiMo1V steam turbine steel have been studied through experiments under high temperature creep conditions, the performance degradation caused by long-term service is difficult to clarify in the laboratory due to the more complex actual service conditions than the experimental conditions. The influence of service conditions on the mechanical properties of 25Cr2NiMo1V rotor steel has not been clearly explained. In order to investigate the performance degradation behavior of 25Cr2NiMo1V rotor steel under long service, the mechanical test of in situ compression was carried out on the micro-nano scale in the base metal area of the welded joint of 25Cr2NiMo1V turbine Sub-steel which has been in service for more than 20 years. The results show that the young's modulus of the sample after long term service is about 77.1% lower than that of the original material; The strengthening index of the sample is about 3.6-6.3 times higher than that of the bulk sample. Due to the influence of local microstructure, the yield strength data fluctuate greatly. Considering the size effect, it can be considered that long-term service has an obvious adverse effect on the yield strength. The current study provides some critical insights into the reliability evaluation of long-term service steam turbine rotors from the micro-scale. ? 2022 SPIE.