X12CrMoWVNbN10-1-1转子钢室温低周疲劳特性

Low cycle fatigue behaviors of X12CrMoWVNbN10-1-1 steel for rotors at room temperature

采用应变控制对超超临界汽轮机转子钢X12CrMoWVNbN10-1-1进行室温低周疲劳试验,并对试验结果进行了讨论.拟合了循环应力-应变曲线和应变-寿命曲线,得到该材料的室温低周疲劳特性参数,包括Ramberg-Osgood参数和Manson-Coffin参数,推测出该材料的转变寿命.对低周疲劳试验开始和结束两个阶段的拉压应力峰值、拉压卸载弹性模量以及迟滞回线面积进行了对比分析,并对不同应变幅控制的低周疲劳对应的应力变化进行了讨论.

Low cycle fatigue（LCF） experiments were carried out under strain control at room temperature on X12CrMoWVNbN10-1-1 steel for rotors used in ultra-supercritical turbines.Some LCF parameters of this material at room temperature including Ramberg-Osgood parameters,Manson-Coffin parameters and transformation life were obtained by fitting the cyclic stress-strain curves and strain-life curves.The peak tensile stress,the peak compression stress,the unloading elasticity moduli of tension and compression,and the area of the hysteresis loop in the LCF initial stage and finial stage were analyzed by comparison.The stress changes corresponding to LCF controlled by different strain amplitudes were discussed.