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Analysis of the Creep Behavior of P92 Steel Welded Joint

机译：P92钢焊接接头的蠕变行为分析

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摘要

Different regions of heat-affected zone (HAZ) were simulated by heat treatment to investigate the mechanisms of the Type IV fracture of P92 (9Cr-2W) steel weldments. Creep deformation of simulated HAZ specimens with uniform microstructures was investigated and compared with those of the base metal (BM) and the weld metal (WM) specimens. The results show that the creep strain rate of the fine-grained HAZ (FGHAZ) is much higher than that of the BM, WM, the coarse-grained HAZ (CGHAZ), and the inter-critical HAZ (ICHAZ). According to the metallurgical investigation of stress-rupture, the FGHAZ and the ICHAZ have the most severely cavitated zones. During creep process, carbides become coarser, and form on grain boundaries again, leading to the deterioration of creep property and the decline of creep strength. In addition, the crack grows along the FGHAZ adjacent to the BM in the creep crack growth test (CCG) of HAZ.
机译：通过热处理模拟了热影响区（HAZ）的不同区域，以研究P92（9Cr-2W）钢焊件IV型断裂的机理。研究了具有均匀组织的模拟热影响区样品的蠕变变形，并将其与母材（BM）和焊接金属（WM）样品的蠕变进行了比较。结果表明，细颗粒热影响区（FGHAZ）的蠕变应变率远高于BM，WM，粗颗粒热影响区（CGHAZ）和临界间热影响区（ICHAZ）的蠕变应变率。根据对应力断裂的冶金研究，FGHAZ和ICHAZ具有最严重的空化区域。在蠕变过程中，碳化物变得更粗糙，并再次在晶界上形成，从而导致蠕变性能变差和蠕变强度下降。另外，在HAZ的蠕变裂纹扩展测试（CCG）中，裂纹沿BM沿FGHAZ扩展。

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