The high‐temperature creep–fatigue (CF) interaction on the service damage of P92 welded joint was uncovered based on the evolution of local creep behaviour by nanoindentation. The creep resistance and high‐angle grain boundary (HAGB) distributions of the different regions of welded joint were investigated for the specimens under individual creep (stress relaxation [RS]), fatigue and CF loadings interrupted at lifetime fractions of 10%, 20%, 30%, 60% and 100%. According to structure evolution including the changes of HAGB and dislocation densities during high‐temperature deformation, the local variation mechanism of creep behaviour at different microstructural zones was systematically discussed.

中文翻译：

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先验蠕变-疲劳相互作用下9％Cr钢焊接接头的组织演变和室温蠕变行为

基于纳米压痕对局部蠕变行为的演变，揭示了P92焊接接头在服务损伤上的高温蠕变疲劳（CF）相互作用。研究了在单个蠕变（应力松弛[RS]），疲劳和CF载荷在寿命分数分别为10％，20％时中断的情况下，试样在焊接接头不同区域的抗蠕变性和高角度晶界（HAGB）分布。 ，30％，60％和100％。根据高温变形过程中HAGB的变化和位错密度的变化，系统地讨论了不同组织区域蠕变行为的局部变化机理。