Abstract Axially push-pull fatigue tests of a low-strength Cr-Ni-Mo-V steel welded joint using cross-weld specimens with two types of sampling, i.e., weld metal centered and heat-affected zone centered, were conducted up to 5 × 107 cycles at room temperature and 300 °C. Fatigue strength of heat-affected zone centered specimen was higher due to dynamic strain aging at weld metal at 300 °C and a locally mismatched deformation around heat-affected zone. The failure location varied as a result of mismatched deformation, structural soft zone, and micro-defects. The sampling dependence implied for a proper fatigue design and assessment of welded structures.

中文翻译：

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焊接接头高周疲劳试验试件设计

摘要 采用交叉焊缝试样对低强度 Cr-Ni-Mo-V 钢焊接接头进行轴向推拉疲劳试验，采用焊缝金属居中和热影响区居中两种取样方式进行了长达 5 次的轴向推拉疲劳试验。 × 在室温和 300 °C 下循环 107 次。由于焊缝金属在 300 °C 的动态应变时效和热影响区周围的局部不匹配变形，热影响区中心试样的疲劳强度更高。由于不匹配的变形、结构软区和微缺陷，破坏位置会发生变化。采样相关性意味着适当的疲劳设计和焊接结构的评估。