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Effect of cyclic loading on subsequent creep behaviour and its implications in creep-fatigue life assessment

机译：周期性载荷对后续蠕变行为的影响及其对蠕变疲劳寿命评估的影响

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Evaluation of creep-fatigue failure is essential in design and fitness evaluation of high-temperature components in power generation plants. Cyclic deformation may alter the creep properties of the material and taking cyclic effects into account may improve the accuracy of creep-fatigue failure life prediction. To evaluate such a possibility, creep tests were conducted on 316FR and modified 9Cr-1Mo steel specimens subjected to prior cyclic loading; their creep deformation and rupture behaviours were compared with those of as-received materials. It was found that creep rupture life and elongation generally decreased following cyclic loading in both materials. In particular, the rupture elongation of 316FR in long-term creep conditions drastically decreases as a result of being cyclically deformed at a large strain range. Use of creep rupture properties after cyclic deformation, instead of those of as-received material, in strain-based and energy-based life estimation approaches brought about a clear improvement of creep-fatigue life prediction.
机译：蠕变疲劳失效的评估对于发电厂高温部件的设计和适应性评估至关重要。循环变形可以改变材料的蠕变特性，并且考虑到循环效应可以提高蠕变疲劳失效寿命预测的准确性。为了评估这种可能性，我们对316FR和经过改良的9Cr-1Mo钢试样进行了蠕变试验，这些试样经受了先前的循环载荷。将它们的蠕变变形和断裂行为与原样进行了比较。发现在两种材料中循环加载后，蠕变断裂寿命和伸长率通常降低。特别地，由于在大应变范围内循环变形，长期蠕变条件下316FR的断裂伸长率急剧降低。在基于应变和基于能量的寿命估算方法中，使用循环变形后的蠕变断裂特性而不是原样材料，可以明显改善蠕变疲劳寿命的预测。

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