Creep Behavior of 2.25Cr-1Mo Steel Shield Metal Arc Weldment

Fujibayashi, Shimpei; Kawano, Koji; Komamura, Takayuki; Sugimura, Takaya

doi:10.2355/isijinternational.44.581

Cited by 6 publications

(5 citation statements)

References 3 publications

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“…[3][4][5][6] While type IV creep failure in the intercritical heataffected zones of welds has been considered as the most important life-limiting failure, creep failures in the weld metal itself have also been reported. [7][8][9] Most typical creep cracks in weld metal occur along the coarse columnar grain boundaries, 7,10 but creep cracking can also occur at the inter-bead boundaries. Allen et al 11 have reported the creep failure of P92 weld metal, which took place by the linkage of creep cracks along the columnar grain boundaries and along the inter-bead boundaries.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of creep-weak zones (white bands) in grade 91 weld metal

Zhang

Shipway

Boué-Bigne³

2009

Science and Technology of Welding and Joining

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A microstructural study of creep failure in grade 91 weld metal has revealed two primary modes of creep failure. In addition to creep fractures along columnar grain boundaries (typical of weld metal creep failure), creep fractures were also found along creep-weak 'white bands' which had formed at the inter-bead boundaries. The white-band regions consisted of material where the M 23 C 6 carbides had dissolved during creep testing; the loss of carbides had allowed recrystallisation of the martensitic structure to ferrite and consequently this material was much softer than the bulk weld metal. The element mapping over the weld metal by laser-induced breakdown spectroscopy demonstrated that there was significant inhomogeneity in the distribution of certain elements, most significantly, chromium. This inhomogeneity resulted in strong activity gradients in carbon (even though the carbon concentration was homogeneous following welding) resulting in carbon loss from the alloy-depleted regions, the associated dissolution of carbides and the recrystallisation that accompanied this, and thus the poor mechanical properties which resulted in creep failure.

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Section: Introductionmentioning

confidence: 99%

Characterisation of creep-weak zones (white bands) in grade 91 weld metal

Zhang

Shipway

Boué-Bigne³

2009

Science and Technology of Welding and Joining

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“…(2). the comparison, rupture data for parent materials and weld metal in the previous works 3,4) are also plotted in these figures. Mean creep strength and lower boundary were derived from the data sheet produced by NIMS, which was NRIM 21B 5) for normalized and tempered 1.25Cr-0.5Mo steel and NRIM 11B 6) for normalized and tempered 2.25Cr-1Mo steel respectively.…”

Section: Time To Rupture and Failure Mode Of Weldmentmentioning

confidence: 99%

“…The failure at the HAZ didn't take place even though the longest testing duration exceeded 15 000 h. Their testing results also implicitly suggest that Type I cracking could become the terminal failure mode for 2.25Cr-1Mo steel, independently of welding techniques. Fujibayashi et al 4) attributed lower creep resistance owned by weld metal of 2.25Cr-1Mo steel to its fully bainitic microstructure. The reason for low creep resistance of fully bainitic microstructure can be explained by the stability of carbides in the weld metal.…”

Section: Pϭln(tmentioning

confidence: 99%

Cross-weld Creep Behavior and Life Prediction of Low Alloy Ferritic Steels

et al. 2004

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The reliability of elevated temperature components depends upon understanding the creep behavior of welds, which often determine the components' lives. The most likely manner of failures at high temperatures for the serviced welds fabricated from low alloy ferritic steels should be Type IV cracking. In the present work using 1.25Cr-0.5Mo and 2.25Cr-1Mo steel welds, however, the location and the morphology of the ultimate failures were influenced by a couple of factors, namely, the magnitude of stress, temperature, time to rupture, specimen geometry and inherent creep properties owned by each alloy. Thus, the consistent relationship between the feature of creep damage and the life consumption to be utilized for the remnant life assessment of welds has not been derived.As the alternative, the authors have examined the cross-weld creep behavior at the tertiary creep stage. Despite the variation of failure types, which were Type I, Type III, Type IV and ductile rupture at the parent material, the omega method predicted the rupture life with the accuracy of a factor of 2. Furthermore, it was found that the linear relationship between e and e appearing at the tertiary creep stage was also available in the life prediction. The slope of strain rate versus strain derived from the above relationship was correlated with the rupture life independently of failure types, specimen geometry and materials and the same level of accuracy as that of the omega method was obtained. From the usefulness of this technique and observation of grain boundary damage at the Intercritical HAZ (ICZ), the authors has interpreted that grains around creep cavities are still subjected to a significant level of stress, suggesting that apparent feature of grain boundary damage dose not necessarily exhibit the remaining creep strength of welds.KEY WORDS: 1.25Cr-0.5Mo steel; 2.25Cr-1Mo steel; creep, welds; life assessment.

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“…[1][2][3] The high-Cr iron-based alloys are generally fabricated by different types of welding, viz. shielded metal arc welding (SMAW), [4][5][6] submerge arc welding (SAW), 7,8) electroslag welding (ESW), 9,10) gas tungsten arc welding (GTAW), 11,12) flux cored arc welding (FCAW), [13][14][15] etc. Among different welding processes, flux cored arc welding has the highest deposition efficiency.…”

Section: Introductionmentioning

confidence: 99%

Acidic Corrosion Behavior of Slag-free Self-shielded Flux-cored Arc Welding Overlay

et al. 2022

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The corrosion resistance of slag-free self-shielded flux-cored welding overlays with different ferrotitanium (Fe-Ti) additions in 3.5 wt.% NaCl + 0.01 mol/L HCl acidic solution was investigated. The corrosion occurs in the matrix rather than M 7 (C, B) 3 , M 3 (C, B) and TiC in the microstructure of all the welding overlays. The corrosion resistance of hypereutectic welding overlay is decreased when the Fe-Ti addition is increased from 0 wt.% to 12 wt.%. The corrosion resistance of the welding overlay is the lowest since the overlay is a eutectic structure at the Fe-Ti addition of 12 wt.%. The eutectic structure increases the interface of corrosion reaction, which accelerates the corrosion rate and increases the corrosion current. With the Fe-Ti addition increasing from 12 wt.% to 24 wt.%, the corrosion resistance of the welding overlays with hypoeutectic structure is gradually increased, owing to the increase of the proportion of TiC and chromium content in the matrix.

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Creep Behavior of 2.25Cr-1Mo Steel Shield Metal Arc Weldment

Cited by 6 publications

References 3 publications

Characterisation of creep-weak zones (white bands) in grade 91 weld metal

Characterisation of creep-weak zones (white bands) in grade 91 weld metal

Cross-weld Creep Behavior and Life Prediction of Low Alloy Ferritic Steels

Acidic Corrosion Behavior of Slag-free Self-shielded Flux-cored Arc Welding Overlay

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