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对广泛使用于电厂主蒸汽管道的 12Cr1MoV耐热钢的蠕变曲线进行了研究 ,将恒应力蠕变与恒载荷蠕变进行对比 ,证明θProjectionConcept方法可以成功地描述恒应力蠕变 ,但不适合恒载荷蠕变。根据 12Cr1MoV钢的恒载荷蠕变曲线 ,提出一种描述恒应力和恒载荷蠕变曲线的修正的θ法 ,从而可利用已有的大量恒载荷蠕变数据 ,有效地进行蠕变曲线的外推。此外在蠕变曲线外推的基础上 ,结合损伤力学分析和归一化处理 ,提出了高温部件寿命逐步外推法的概念 ,从而摆脱了以往寿命外推方法存在的种种局限性 ,如工况的波动、组织的变化、材料自身的差异等带来的误差 ,使寿命预测更趋准确
The creep curves of 12Cr1MoV heat-resisting steel, widely used in the main steam pipelines of power plants, are studied. The comparison between constant stress creep and constant load creep shows that the θProjectionConcept method can successfully describe the creep of constant stress but not suitable for constant creep Load creep. According to the constant load creep curve of 12Cr1MoV steel, a modified θ method is presented to describe creep curves of constant stress and constant load, so that the creep curve can be effectively extrapolated by using a large amount of creep data of constant load . In addition, based on the extrapolation of the creep curve and the damage mechanics analysis and normalization, the concept of gradual extrapolation of the service life of high-temperature components is put forward, so as to get rid of the limitations of previous life extrapolation methods such as operating conditions Fluctuations in the organization, changes in the organization, differences in the material itself, etc. bring more accurate life prediction