CAJ | 학술논문

通过室温拉伸、高温拉伸和冲击等试验研究了经过长期服役后的高中压转子30Cr1Mo1V钢不同位置的性能变化,并分析了转子强度和韧性变化的原因.结果表明：转子服役温度高的部位碳化物的形貌、分布和大小均发生变化,贝氏体和铁素体中的碳化物析出、聚集或长大,而原奥氏体晶界和贝氏体与铁素体边界处碳化物析出增多,碳化物颗粒变得粗大;不同位置的拉伸性能差别不大,服役温度最高位置的拉伸强度最低,冲击韧性下降;不同部位总冲击能量的降低主要表现为裂纹形成能的降低,而裂纹扩展能区别很小;高中压转子30Cr1Mo1V钢服役时高温位置的韧脆性转变温度（FATT50）比低温位置明显升高.
통과실온랍신、고온랍신화충격등시험연구료경과장기복역후적고중압전자30Cr1Mo1V강불동위치적성능변화,병분석료전자강도화인성변화적원인.결과표명：전자복역온도고적부위탄화물적형모、분포화대소균발생변화,패씨체화철소체중적탄화물석출、취집혹장대,이원오씨체정계화패씨체여철소체변계처탄화물석출증다,탄화물과립변득조대;불동위치적랍신성능차별불대,복역온도최고위치적랍신강도최저,충격인성하강;불동부위총충격능량적강저주요표현위렬문형성능적강저,이렬문확전능구별흔소;고중압전자30Cr1Mo1V강복역시고온위치적인취성전변온도（FATT50）비저온위치명현승고.
Mechanical properties of 30Cr1Mo1V steel samples taken from different areas of an HP-IP turbine rotor after long-term service were studied by tensile,impact and FATT50 tests respectively at room and high temperatures,after which causes leading to the material changes in strength and toughness were analyzed.Results show that in areas of rotor enduring high service temperatures,the morphology,distribution and sizes of carbides may change a lot;the carbides precipitated from bainite and ferrite will aggregate and grow;carbides may gradually precipitate and get coarsening at the boundary of original austenite grain and that between bainite and ferrite.The degradation of tensile properties differs slightly at different locations,and the greatest degradation occurs in the area enduring highest service temperatures,where the corresponding toughness will reduce accordingly.The decrease of total impact energy is mainly from the decrease of the crack forming energy,and the crack propagation energy doesn’t show large difference for all locations.Compared with areas enduring low service temperatures,the fracture appearance transition temperature（FATT50） in areas enduring high service temperatures is obviously higher.