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在540℃和565℃温度下进行了30Cr1Mo1V的蠕变试验,采用Kachanov蠕变损伤公式、Norton蠕变损伤公式和q 函数法对蠕变实验数据进行了计算分析。采用q 函数法求得的最小蠕变速度作为Norton蠕变损伤公式中的第2阶段蠕变速度。分析结果显示,在两种温度下采用kachanov公式计算的损伤是一致的。比较Kachanov蠕变损伤公式和Norton蠕变损伤公式计算的损伤因子,发现存在较大差异。Norton公式计算表明,损伤与应力水平有关系,应力变量和损伤变量相互耦合。Kachanov计算模型只有在蠕变的时间分数小于0.7是安全的。
The creep tests of 30Cr1Mo1V at 540 ℃ and 565 ℃ were carried out. The creep test data were calculated and analyzed by Kachanov creep damage formula, Norton creep damage formula and q function method. The minimum creep speed determined by the q-function method is used as the second stage creep speed in the Norton creep damage formula. The analysis shows that the damage calculated using kachanov’s formula at both temperatures is consistent. Comparison of Kachanov creep damage formula and Norton creep damage formula to calculate the damage factor, found that there is a big difference. Norton’s formula shows that the damage is related to the stress level, and the stress and damage variables are coupled with each other. The Kachanov calculation model is only safe if the time fraction of creep is less than 0.7.