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首页> 外文期刊>Materials at High Temperatures >Low cycle fatigue and creep-fatigue interaction behaviour of 2.25Cr1MoV steel at elevated temperature
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Low cycle fatigue and creep-fatigue interaction behaviour of 2.25Cr1MoV steel at elevated temperature

机译：2.25Cr1MoV钢在高温下的低周疲劳和蠕变疲劳相互作用行为

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摘要

This study reports the fatigue behaviour of 2.25Cr1MoV steel under low cycle fatigue (LCF) loading and creep-fatigue interaction (CFI) loading at 355, 455 and 555 degrees C. Various hold durations up to 600 s were introduced in the CFI tests at the peak/valley strain under strain or stress control. In LCF tests, the steel exhibited remarkable strengthening at 455 degrees C, which can be ascribed to the effect of dynamic strain aging. In CFI tests, tensile holds were found more damaging than compressive holds but considerably less harmful than the combined tensile-compressive holds. A modified plastic strain energy approach based on the damage mechanisms was proposed to predict fatigue life under LCF and CFI conditions. The predictions obtained compared very favourably with the experimental results.
机译：这项研究报告了2.25Cr1MoV钢在355、455和555摄氏度的低循环疲劳（LCF）载荷和蠕变疲劳相互作用（CFI）载荷下的疲劳行为。CFI测试中引入了600 s的各种保持时间在应变或应力控制下的峰/谷应变。在LCF测试中，该钢在455摄氏度时表现出显着的强化作用，这可以归因于动态应变时效的影响。在CFI测试中，发现拉伸固持比压缩固持更具破坏性，但比组合的拉伸-压缩固持有害得多。提出了一种基于损伤机理的改进塑性应变能方法，以预测LCF和CFI条件下的疲劳寿命。获得的预测与实验结果相比非常有利。

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