The parameters of 316H stainless steel creep constitutive equation at different stages were cali-brated based on Norton-Bailey model.With a view to determining the demarcation point of the first two stages legitimately,a data processing method was proposed.In this method,through presenting a set of stress-related initial demarcation time values,the creep parameters were fitted and calibrated in stages re-spectively,and the best square approximation method was used to correct the demarcation time to obtain best creep parameters.Based on the creep data provided by ASME BPVC.Ⅲ.5-2021,the creep parame-ters of 316 stainless steel at 500℃and 550℃were fitted respectively to show that,the fitted curves are in good agreement with the original data.
关键词
316H不锈钢/Norton-Bailey模型/蠕变分界点/多元线性回归/分段拟合
Key words
316H stainless steel/Norton-Bailey model/creep demarcation point/multiple linear regres-sion/piecewise fitting
维普
万方数据