Creep Fracture Analysis of W Strengthened 9% Cr Steel Weldment

Xue Wang; Qian Gang Pan; Zi Jun Liu; Hui Qiang Zeng; Yong Shun Tao

doi:10.4028/www.scientific.net/AMR.154-155.1699

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 154-155Creep Fracture Analysis of W Strengthened 9% Cr...

Creep Fracture Analysis of W Strengthened 9% Cr Steel Weldment

Abstract:

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 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 failure. In addition to coarsening of M23C6 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 failure.

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Periodical:

Advanced Materials Research (Volumes 154-155)

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1699-1704

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.154-155.1699

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Online since:

October 2010

Authors:

Xue Wang, Qian Gang Pan, Zi Jun Liu, Hui Qiang Zeng, Yong Shun Tao

Keywords:

9Cr Steel, Creep Failure, Microstructure, P92, Weld Joint

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