Stress rupture initiated by the carbides in the grain boundaries of the multi-pass weld metal

Wei, Tao; Ding, Kai; Wu, Guanzhi; Liu, Xia; Fan, Manjie; Zhang, Yanbin; He, Yi; Huo, Xin; Gao, Yulai

doi:10.1016/j.jmrt.2020.12.031

Cited by 10 publications

(2 citation statements)

References 20 publications

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“…GB carbides (such as Mo-rich M6C and Cr-rich M23C6 phases) in the metal after multi-pass welding can initiate a stress rupture in the 9%Cr-CrMoV The hardness of boronized AISI 1045 steel depends on the shape of iron borides in a GB Fe-based matrix [36]. GB carbides (such as Mo-rich M 6 C and Cr-rich M 23 C 6 phases) in the metal after multi-pass welding can initiate a stress rupture in the 9%Cr-CrMoV welded joints [40]. M 23 C6, MX carbides, σ phases, Z phase, and ε-Cu phase precipitate in the Super 304H austenitic stainless steel after long-term aging.…”

Section: Influence Of Gb Wetting By the Second Solid Phase On The Pro...mentioning

confidence: 99%

Grain Boundary Wetting by the Second Solid Phase: 20 Years of History

Straumal

Lepkova

Korneva

et al. 2023

Metals

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Grain boundaries (GBs) can be wetted by a second phase. This phase can be not only liquid (or melted), but it can also be solid. GB wetting can be incomplete (partial) or complete. In the case of incomplete (partial) wetting, the liquid forms in the GB droplets, and the second solid phase forms a chain of (usually lenticular) precipitates. Droplets or precipitates have a non-zero contact angle with the GB. In the case of complete GB wetting, the second phase (liquid or solid) forms in the GB continuous layers between matrix grains. These GB layers completely separate the matrix crystallites from each other. GB wetting by a second solid phase has some important differences from GB wetting by the melt phase. In the latter case, the contact angle always decreases with increasing temperature. If the wetting phase is solid, the contact angle can also increase with increasing temperature. Moreover, the transition from partial to complete wetting can be followed by the opposite transition from complete to partial GB wetting. The GB triple junctions are completely wetted in the broader temperature interval than GBs. Since Phase 2 is also solid, it contains GBs as well. This means that not only can Phase 2 wet the GBs in Phase 1, but the opposite can also occur when Phase 1 can wet the GBs in Phase 2. GB wetting by the second solid phase was observed in the Al-, Mg-, Co-, Ni-, Fe-, Cu-, Zr-, and Ti-based alloys as well as in multicomponent alloys, including high-entropy ones. It can seriously influence various properties of materials.

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Section: Influence Of Gb Wetting By the Second Solid Phase On The Pro...mentioning

confidence: 99%

Grain Boundary Wetting by the Second Solid Phase: 20 Years of History

Straumal

Lepkova

Korneva

et al. 2023

Metals

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“…Welding is the primary method to manufacture metal components in industry [ 1 , 2 ]. Butt joints are frequently applied in oil and gas transportation, construction machinery, and pressure vessels.…”

Section: Introductionmentioning

confidence: 99%

Effect of Butt Gap on Stress Distribution and Carrying Capacity of X80 Pipeline Girth Weld

Zhu

Jia²,

et al. 2022

Materials

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An unstable assembly gap is detrimental to the formation and performance of the pipeline butt girth weld joint. Therefore, a numerical model of an 18.4 mm-thick X80 pipeline girth weld by a homogeneous body heat source was established to investigate the effect of the butt gap on the joint temperature and stress field, and carrying capacity. The accuracy of the simulation results was verified by measuring the welding thermal cycle with a thermocouple. The investigation results showed that the weld pool, heat-affected zone (HAZ) width, and maximum circumferential stress of the joint rose with the increase in the butt gap. The tensile stress unfavorable to the joint quality was mainly distributed in the weld metal and partial HAZ, and the distribution areas gradually expanded as the gap increased. The Von Mises stress peak value of the joint appeared in the order of 3 mm > 2 mm > 1 mm > 0 mm gap, reaching the maximum of 467.3 MPa (3 mm gap). This variation trend is directly related to the improvement in welding heat input with increasing butt gaps. The maximum Von Mises stress of the joint was positively correlated with the carrying capacity of the pipeline, which diminished as the butt gap enlarged. The pipeline carrying capacity reached 17.8 MPa for the joint with no butt gap, and dropped to 13.1 MPa for the joint with a 3 mm gap. The relationship between the carrying capacity (P) and butt gap (C) was described by P = −0.125C2 − 1.135C + 17.715, through which the pipeline carrying capacity with other butt gaps can be predicted.

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Rupture behavior and fracture mode for Inconel 625–9% Cr steel dissimilar welded joints at high temperature

Ding

Wei

et al. 2021

Engineering Failure Analysis

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Stress rupture initiated by the carbides in the grain boundaries of the multi-pass weld metal

Cited by 10 publications

References 20 publications

Grain Boundary Wetting by the Second Solid Phase: 20 Years of History

Grain Boundary Wetting by the Second Solid Phase: 20 Years of History

Effect of Butt Gap on Stress Distribution and Carrying Capacity of X80 Pipeline Girth Weld

Rupture behavior and fracture mode for Inconel 625–9% Cr steel dissimilar welded joints at high temperature

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