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The effect of stress relaxation loading cycles on the creep behaviour of 2.25Cr-1Mo pressure vessel steel

机译:应力松弛加载周期对2.25Cr-1Mo压力容器钢蠕变行为的影响

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This paper investigates the effects of repeated stress relaxation loadings and post stress relaxation creep to assess the stress relaxation-creep interaction and microstructural evolution of 2.25Cr-lMo steel. Prior to creep testing, the microstructure of the material subjected to stress relaxation exhibited a structure which was non-conservative in predicting the remaining creep life of the material. The results obtained in the test program showed that the damage due to the effects of stress relaxation was crucial and had a significant effect on the creep life of this material. The study has also shown that the extent of metallurgical degradation, due to stress relaxation, may not be evident through microstructural assessment. Consequently, established life assessment procedures may not represent conservative estimates of remaining life because the microstructural indicators of damage, due to stress relaxation, are not evident. The effects of stress relaxation on the creep properties of ferritic pressure vessel steel are life limiting for critical high temperature power generation plant. In this study a comprehensive test program has been undertaken to assess the interaction of stress relaxation with creep and microstructural evolution in 2.25Cr-lMo steel.
机译:本文研究了重复应力松弛载荷和应力松弛后蠕变的影响,以评估2.25Cr-1Mo钢的应力松弛-蠕变相互作用和组织演变。在蠕变测试之前,经受应力松弛的材料的微观结构表现出在预测材料的剩余蠕变寿命方面非保守的结构。在测试程序中获得的结果表明,由于应力松弛的影响而造成的损坏至关重要,并且对该材料的蠕变寿命具有重大影响。该研究还表明,由于应力松弛,冶金降解的程度可能无法通过显微组织评估得出。因此,已建立的寿命评估程序可能无法代表对剩余寿命的保守估计,因为由于应力松弛而造成的破坏的微观结构指标不明显。应力松弛对铁素体压力容器钢蠕变性能的影响限制了临界高温发电厂的寿命。在这项研究中,已经进行了全面的测试程序,以评估2.25Cr-1Mo钢中应力松弛与蠕变和微观组织演变的相互作用。

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