Improvement of Creep Life Prediction of High Cr Ferritic Creep Resistant Steels by Region Partitioning Method of Stress vs. Time to Rupture Diagram.
Improvement of Creep Life Prediction of High Cr Ferritic Creep Resistant Steels by Region Partitioning Method of Stress vs. Time to Rupture Diagram.
复制标题
通过应力与断裂时间图的区域划分方法改进高铬铁素体抗蠕变钢的蠕变寿命预测。
DOI：
10.2472/jsms.52.57
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
F. Abe
中科院分区：
文献类型：
--
作者：
K. Kimura;H. Kushima;F. Abe
本文结合应力-时间图分区法，研究了9- 12 Cr铁素体抗蠕变钢蠕变寿命的预测方法。本文从应力-断裂时间曲线上观察到的断裂与蠕变变形行为和0.2%屈服应力的变化相对应的观点出发，讨论了应力-断裂时间图的分区方法。在第三蠕变阶段的起始应变为0.012和0.2%屈服应力的1/2的应力条件下，观察到应力-断裂时间曲线的断裂之间有很好的对应关系。结果表明，在小于0.2%屈服应力的1/2应力区的蠕变断裂数据，应采用Larson-Miller参数（常数为20）进行长期蠕变寿命预测。
Creep life prediction method has been investigated on 9-12Cr ferritic creep resistant steels in conjunction with region partitioning method of stress vs. time to rupture diagram. Region partitioning method of stress vs. time to rupture diagram has been discussed from a viewpoint of correspondence of breakdown observed in stress vs. time to rupture curves with both change in creep deformation behaviour and 0.2% proof stress. Good correspondence have been observed between breakdown in stress vs. time to rupture curve and the stress condition where the onset strain of tertiary creep stage is 0.012 and 1/2 of the 0.2% proof stress. It has been concluded that creep rupture data in the stress region less than 1/2 of the 0.2% proof stress should be used for a long-term creep life prediction by Larson-Miller parameter with a constant of 20.