【摘要】 在650℃、700℃和750℃条件下对超临界水堆(SCWR)包壳候选材料之一镍基合金C276进行高温蠕变试验,采用损伤力学方法对试验数据进行计算分析,分别对由Kachanov和基于θ外推法的Norton蠕变损伤公式计算的损伤因子进行比较。分析结果表明:3种温度下采用Kachanov公式计算的蠕变损伤趋于一致;采用θ外推法拟合的蠕变曲线与试验蠕变曲线吻合很好;Norton公式计算表明损伤开始发生在0.3~0.4寿命左右,Kachanov公式计算的损伤因子偏保守。更多还原

【Abstract】 High temperature creep tests were carried out for Ni-based alloy C276 at 650℃,700℃and 750℃,which is one of the candidate materials for the fuel cladding of the supercritical water reactor.Methods of damage mechanics were adopted to calculate and analyze these data.Damage factors calculated by Kachanov formula and Norton formula based on θ projection method were compared.The results show that the damage factors about the material are similar at the three temperatures according to Kachanov formula.The predicted creep curves calculated by θ projection method have a close agreement with the experimental data.The damages calculated by Norton formula start at about 0.3~0.4 lifetime,and the damage factors calculated by Kachanov formula are relatively conservative.更多还原