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Creep rupture behaviour of P92 steel weldment

机译：P92钢焊件的蠕变断裂行为

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摘要

This paper describes the creep rupture behaviour, hardness distribution and microstructure of weldment made by submerge arc welding for W strengthened P92 steel. The cross-weld creep tests were carried out at 923 K and at stress ranging from 100 to 130 MPa. For stress below 120 MPa, weld-joints 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 Fe_2(Mo,W) Laves phase precipitated on grain boundaries during creep is probably the significant factors caused the type IV failure.
机译：本文介绍了W增强P92钢通过埋弧焊制成的焊件的蠕变断裂特性，硬度分布和显微组织。交叉焊接蠕变测试是在923 K和100至130 MPa的应力范围内进行的。对于低于120 MPa的应力，焊缝会因IV型裂纹而破裂，该裂纹位于其细晶粒热影响区（FGHAZ）中，测量的交叉焊接硬度最小。脆性IV型破坏导致焊件的蠕变断裂强度大幅下降。除了在FGHAZ中粗化M_（23）C_6碳化物和等轴细晶粒外，蠕变过程中在晶界上析出的金属间Fe_2（Mo，W）Laves相可能是导致IV型失效的重要因素。

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