不同温度下15CrMoR循环塑性实验研究及低周疲劳寿命预测  

EXPERIMENTAL STUDY ON CYCLIC PLASTICITY AND PREDICTION OF LOW CYCLIC FATIGUE LIFE FOR 15CrMoR AT DIFFERENT TEMPERATURE

作　　者：李青[1] 董俊华[1] 余伟炜[2] 高炳军[1] 

机构地区：[1]河北工业大学化工学院,天津300130 [2]苏州热工研究院有限公司,苏州215004

出　　处：《机械强度》2014年第3期368-373,共6页Journal of Mechanical Strength

基　　金：河北省自然科学基金资助项目(E2011202044)资助~~

摘　　要：在20℃,200℃,300℃和400℃下对15CrMoR进行了循环塑性行为和棘轮效应—疲劳交互作用的实验研究。不同温度下全寿命内循环塑性实验表明,非对称循环加载的大部分时段棘轮应变率基本保持稳定,后期接近失效阶段才急速增大。各温度下棘轮应变随平均应力、应力幅的增大而增大。低周疲劳寿命受平均应力和应力幅的共同影响,但应力幅的影响更大。与Coffin-Manson模型及Morrow修正模型相比,各温度下MSRS模型对材料疲劳寿命的预测更为准确。采用含温度参数的MSRS模型可较方便地预测不同温度下材料的疲劳寿命。Cyclic plasticity behavior and ratcheting4atigue interaction of 15CrMoR at 20℃ ,200 ℃ , 300 ℃ and 400 ℃ were experimentally studied. According to the result of the experiments of cyclic plasticity within the fatigue life at different temperature, the ratcheting strain rate keeps stable for a long period of the asymmetrical cyclic loading, but increases rapidly near the final failure. At different temperature, ratcheting strain grew with the increase of the mean stress or the stress amplitude. Low cycle fatigue life was influenced by both the mean stress arid the stress amplitude, but more by the latter. The prediction of the fatigue life by the MSRS model is more accurate at different temperature compared with the Coffin-Manson model and the modified Morrow model. The MSRS model with the temperature parameter will be more convenient in calculating the fatigue life at different temperature.

关 键 词：15CrMoR 棘轮效应 低周疲劳 温度 寿命预测 

分 类 号：TG115.57[金属学及工艺—物理冶金]