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《Journal of Materials Engineering》 2012-11
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Fatigue Behavior of 30Cr1Mo1V Rotor Steel at Elevated Temperature After Long-term Service

YAN Yi-min1,HU Zheng-fei1,LIN Fu-sheng2,ZHAO Shuang-qun2(1 School of Materials Science and Engineering,Tongji University,Shanghai 200092,China; 2 Shanghai Power Equipment Research Institute,Shanghai 200240,China)  
The low cycle fatigue and fatigue crack growth rate tests are described in the detail for a steam turbine rotor steel 30Cr1Mo1V which had been in service for 16 years.Three typical sections of the examined rotor,i.e.high-temperature,high-stress and medium-stress,were experimented at 538℃.The test results shows that the property of the high temperature section is degraded most severely and the high stress section takes the second place.The corresponding microstructure observations show that the original sorbite structure decomposed almost completely in high temperature and high stress sections.Carbides were coarsened or spheroidized strikingly,with a continuous chain of large size carbides present in the grain boundary.A few microvoids were found at grain boundary in the high temperature section.These phenomena in microstructure might be the reasons for properties degradation.
【Fund】: 国家自然科学基金项目(50871076);; 上海科委项目(09521101305)
【CateGory Index】: TG142.1
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