CAJ | 학술논문

分别用频率修正法、拉伸迟滞能模型、三参数幂函数能量方法和能量法简化模型对三种镍基高温合金材料的热机械疲劳寿命进行预测，并对这些方法的热机械疲劳寿命预测能力进行了评估。结果表明，这些寿命预测方法都能在不同程度上适用于镍基高温合金的热机械疲劳寿命预测，其中能量法简化模型效果最好。热机械疲劳过程中起主导作用的损伤机制与等温疲劳具有一定程度的相似性。从模型寿命预测能力的定量评定可知，只考虑塑性形变的作用时，对反相热机械疲劳寿命的预测效果好于对同相热机械疲劳的预测效果。此外，与其他模型相比，能量法简化模型从能量守恒的角度来看具有一定的理论基础，且预测效果较好，适用于预测镍基合金的热机械疲劳寿命。
분별용빈솔수정법、랍신지체능모형、삼삼수멱함수능량방법화능량법간화모형대삼충얼기고온합금재료적열궤계피로수명진행예측，병대저사방법적열궤계피로수명예측능력진행료평고。결과표명，저사수명예측방법도능재불동정도상괄용우얼기고온합금적열궤계피로수명예측，기중능량법간화모형효과최호。열궤계피로과정중기주도작용적손상궤제여등온피로구유일정정도적상사성。종모형수명예측능력적정량평정가지，지고필소성형변적작용시，대반상열궤계피로수명적예측효과호우대동상열궤계피로적예측효과。차외，여기타모형상비，능량법간화모형종능량수항적각도래간구유일정적이론기출，차예측효과교호，괄용우예측얼기합금적열궤계피로수명。
Frequency modified method ,Ostergren method ,the energy method of three parameter power function and the simplified energy method were chosen to predict TMF life in three nickel-base superalloys .And the prediction ability of them was assessed .The results indicat that the above methods could predict the TMF life of three nickel-base superalloys at some extent .The simplified energy method among the method was the best .The main damage mechanism of TMF was partly similar to isothermal fatigue .According to quantitative evaluation of life prediction ability to the model ,the effect of fatigue lifetime prediction on out-of-phase was better than in-phase only when the plastic deformation was considered .What's more , the simplified energy method which was based on the law of energy conservation had the rationales . And the prediction capability of that method was better than the other methods .Therefore ,it was suitable to forecast the lifetime of TMF in nickel-based superalloy .