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分析了现有蠕变加速试验方法,特别是基于超出弹性应变初应变的松弛试验的蠕变设计方法的固有缺陷。进行了高温材料1Cr10NiMoW2VNbN的多组短时应力松弛试验;根据松弛与蠕变的关系,综合利用数值计算方法和图解法获得材料稳态蠕变应变速率,以进行蠕变强度设计,形成一套完整的基于应力松弛的蠕变加速试验方法。结果发现,基于短时松弛试验转换得到的蠕变数据与常规蠕变试验结果吻合较好,表明这一方法可用于高温构件的蠕变行为预测和强度设计。
The inherent drawbacks of existing creep acceleration test methods, and in particular creep design methods based on relaxation tests beyond the initial strain of elastic strain, have been analyzed. A series of short-time stress relaxation tests of high temperature materials 1Cr10NiMoW2VNbN were carried out. Based on the relationship between relaxation and creep, the steady-state creep strain rate of the material was obtained by numerical calculation and graphic method, so that a complete set of creep strength design The stress relaxation based creep accelerated test method. The results show that the creep data based on the short-term relaxation test agree well with the results of conventional creep tests, indicating that this method can be used to predict the creep behavior and strength of high-temperature components.