摘要
在不同温度T和不同应力σ下对25Cr35Ni耐热钢进行蠕变试验,引入参数P对不同蠕变应变下的温度和时间进行归一化处理,分析了(P,σ)数据点随蠕变应变的变化规律,引入参数Z_c分析了数据的分散程度并使用蠕变应变为5.0%下的试验数据对持久寿命进行了预测。结果表明:随蠕变应变的增加,σ-P曲线趋近于断裂曲线,Z_c先迅速增大后趋于稳定,(P,σ)数据点与其对应拟合曲线的偏差减小;基于Z_c参数法预测得到的持久寿命与实测持久寿命接近,数据分散程度较小。
Creep tests were conducted on 25Cr35Ni heat-resistant steel at different temperatures T and different stressesσ.The temperature and time at different creep strains were normalized by introducing parameter P.The variation of（P,σ）data point with creep strain was analyzed.Parameter Zc was proposed to analyze the dispersion degree of data and to predict the creep rupture life with experimental data at creep strain of 5.0%.The results show that with increasing creep strain,theσ-P curve became close to the fracture curve;the value of Zc increased rapidly and then became stable;the deviation between（P,σ）data point and the corresponding fitting curve decreased.The predicted rupture lives on basis of Zc parameter method were close to the experimental rupture lives;the dispersion degree was relatively small.
作者
刘薪月
曹铁山
李会芳
程从前
孟宪明
赵杰
LIU Xinyue;CAO Tieshan;LI Huifang;CHENG Congqian;MENG Xianming;ZHAO Jie(School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China;China Automotive Technology ＆ Research Center, Tianjin 300300, China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2018年第6期26-29,共4页
Materials For Mechanical Engineering
基金
国家高技术研究发展计划(863计划)项目(2015AA034402)
国家自然科学基金资助项目(U1610256)
关键词
耐热钢
Zc参数法
持久寿命预测
heat-resistant steel
Zc parameter method
creep rupture life prediction
