Low cycle fatigue behaviors of X12CrMoWVNbN10-1-1 steel for rotors at room temperature
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摘要: 采用應變控制對超超臨界汽輪機轉子鋼X12CrMoWVNbN10-1-1進行室溫低周疲勞試驗,并對試驗結果進行了討論.擬合了循環應力-應變曲線和應變-壽命曲線,得到該材料的室溫低周疲勞特性參數,包括Ramberg-Osgood參數和Manson-Coffin參數,推測出該材料的轉變壽命.對低周疲勞試驗開始和結束兩個階段的拉壓應力峰值、拉壓卸載彈性模量以及遲滯回線面積進行了對比分析,并對不同應變幅控制的低周疲勞對應的應力變化進行了討論.Abstract: 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.
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Key words:
- heat resistant steel /
- low cycle fatigue /
- strain control /
- fatigue life /
- rotors
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