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Creep fracture analysis of W strengthened 9Cr steel weldment

机译：W强化9％Cr钢焊接的蠕变断裂分析

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The creep rupture behaviour,hardness distribution and microstructure of weldment made by submerge arc welding for W strengthened P92 steel are described in this paper. The cross-weld creep tests were carried out at 923K under stresses in the ranges 130-100MPa. For stress below 120MPa, weld-joints were ruptured by the Type IV crack, which located in their fine-grained heat affected zone(FGHAZ)with the smallest measured cross-weld hardness. A strong drop in creep rupture strength of weldment was induced by brittle type IV failure. In addition to coarsening of M_(23)C_6 carbides and an equiaxed fine grains in FGHAZ, intermetallic Fe2(Mo,W)Laves phase precipitated on grain boundaries during creep is probably the significant factor caused the type IV failure.
机译：本文描述了通过浸没式P92钢的浸没电弧焊接制造的焊接的蠕变破裂行为，硬度分布和微观结构。横焊蠕变试验在130-100MPa的范围内的应力下进行923K。对于低于120MPa的应力，焊接接头被IV型裂缝破裂，其位于其细粒度热影响区（FGHAZ）中，具有最小的测量的横向硬度。通过脆性IV型衰竭诱导焊接强度强度强度下降。除了粗化的M_（23）C_6碳化物和FGGHAZ中的等轴细粒外，金属间FE2（MO，W）灌注液相可能导致IV型失效的重要因素可能是显着的因素。

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