Prediction for Creep Behavior and Creep Rupture Life of 25Cr35Ni Heat Resistant Steel on Basis of Parameter Zc
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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Zc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，Zc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Zc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。Abstract: Creep tests were conducted on 25Cr35Ni heat-resistant steel at different temperatures T and different stresses σ. 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, the σ-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.
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