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Understanding room temperature deformation behavior through indentation studies on modified 9Cr-1Mo steel weldments

机译：通过对9Cr-1Mo改性焊件的压痕研究了解室温变形行为

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摘要

Deformation behavior of boron free (P91) and boron added (P91B) modified 9Cr-lMo steel weldments was studied at room temperature using an indentation technique. A sub-structure consisting of sub-grains was observed in the inter-critical heat affected zone (ICHAZ), whereas lath martensitic structure was observed in the coarse grain heat affected zone (CGHAZ) of the P91 weldment. Consequently, weldment showed significant variation in hardness as well as strain rate sensitivity in different regions of the HAZs. On the other hand, P91B steel weldment showed small variation in hardness and strain rate sensitivity, which was commensurate with uniform microstructure consisting of lath martensite. These differences in microstructures as well as hardness values also reflected in large variation in creep depth in P91 compared to the small variation in P91B weldment.
机译：使用压痕技术在室温下研究了无硼（P91）和加硼（P91B）改性的9Cr-1Mo钢焊件的变形行为。在临界热影响区（ICHAZ）中观察到由亚晶粒组成的亚结构，而在P91焊件的粗晶粒热影响区（CGHAZ）中观察到了板条马氏体结构。因此，焊件在热影响区的不同区域显示出硬度以及应变速率敏感性的显着变化。另一方面，P91B钢焊件的硬度和应变率敏感性变化很小，这与由板条马氏体组成的均匀组织相称。与P91B焊件的小变化相比，P91的蠕变深度的大变化也反映了微观结构和硬度值的这些差异。

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