15CrMoR焊缝区及母材区低周疲劳寿命预测  

LOW CYCLE FATIGUE LIFE PREDICTIONS OF 15CrMoR PARENT MATERIAL AND WELD METAL

作　　者：马凯[1] 王传志 董俊华[1] 高炳军[1] 

机构地区：[1]河北工业大学化工学院,天津300130 [2]北京燕华建筑安装工程有限责任公司设备制造公司,北京102502

出　　处：《机械强度》2016年第4期703-710,共8页Journal of Mechanical Strength

基　　金：河北省自然科学基金项目(E2011202044)资助~~

摘　　要：制作了焦炭塔用材15Cr MoR的对接试件,对其母材区及焊缝区金属进行了不同温度的单轴拉伸试验与全寿命单轴棘轮效应试验。利用OW-II随动强化模型对材料的棘轮效应进行预测,模型能较好地预测材料稳定段的棘轮应变率。通过单轴拉伸试验数据得出预测低周疲劳寿命的基本参数,选用考虑棘轮效应的MSRS模型对母材区焊缝区材料疲劳寿命进行预测,预测结果均在2倍误差带以内,而且预测结果均匀分布在45°精确线两侧。利用OW-II随动强化模型在相同工况下预测出的母材区焊缝区稳定段棘轮应变率,应变幅值,带入MSRS模型,预测结果表明母材区疲劳寿命明显低于焊缝区,稳定段棘轮应变率母材区明显高于焊缝区。Butt-weld specimen has been made for coke drum material 15 Cr MoR. For both parent and weld materials,uniaxial tensile tests and uniaxial ratcheting tests have been conducted under different temperatures. The OW-II kinematic hardening constitutive model has been used to predict the material ratcheting effect using the experimental data obtained. Test results show that the OW-II model can well predict ratcheting strain rates for the stable period. Based on the obtained uniaxial tensile test data,basic parameters for predicting low cycle fatigue life have been obtained. The MSRS model has been used to predict the fatigue lives of the parent material and weld metal. The predicted results are within the 2 times error band and are uniformly distributed on both sides of 45 ° line accurately. Furthermore,the ratcheting strain rate and the strain amplitude for the stable period are obtained for the parent metal and the weld metal respectively by the OW-II kinematic hardening constitutive model under the same conditions. The MSRS model predicts that the fatigue life of the parent material is significantly lower than that of the weld metal and during the stable period the ratcheting strain rate of parent material is significantly higher than that of the weld metal.

关 键 词：15CrMoR 棘轮效应 低周疲劳 寿命预测 

分 类 号：TG115.57[金属学及工艺—物理冶金]