In-situ observation of high-temperature failure behavior of pipeline steel and investigation on burn-through mechanism during in-service welding

Wu, Qian; Han, Tao; Wang, Yong; Wang, Hongtao; Zhang, Hongjie; Gu, Shitan

doi:10.1016/j.engfailanal.2019.104236

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…4(e)-(f)). The m 23 c 6 carbides precipitated at the grain boundaries can be generated cr-depleted zones which increased vacancy diffusion at grain boundaries and enhanced intergranular fracture [16]. as a result, m 23 c 6 carbides acted as stress concentration sites and grain boundary embrittlement occurred easily [17,18].…”

Section: Resultsmentioning

confidence: 99%

Archives of Metallurgy and Materials

Ko,

Park,

Yoo

et al. 2021

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In-sItu ObservatIOn Of HIgH-temperature fracture beHavIOur Of 347 staInless steel subjected tO sImulated WeldIng prOcessIn-situ study on the high-temperature fracture behaviour of 347 stainless steel was carried out by using a confocal laser scanning microscope (clSm). The welding microstructures of the 347 stainless steel were simulated by subjecting the steel specimen to solution and aging treatments. undissolved nbc carbides were present within grains after solution treatment, and m 23 c 6 carbides were preferentially formed at grain boundaries after subsequent aging treatment. The m 23 c 6 carbides formed at grain boundaries worked as stress concentration sites and thus generated larger cracks during high-temperature tensile testing. In addition, grain boundary embrittlement was found to be a dominant mechanism for the high-temperature fracture of the 347 stainless steel because vacancy diffusion in the cr-depleted zones enhances intergranular fracture due to the precipitation of m 23 c 6 carbides at grain boundaries.

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Section: Resultsmentioning

confidence: 99%

Archives of Metallurgy and Materials

Ko,

Park,

Yoo

et al. 2021

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“…Owing to the flowing high-pressure medium inside the in-service pipeline, the in-service welding instability is still the primary problem to be solved, which plays a crucial role in ensuring construction safety and controlling service quality [1]. For the sake of the engineering application value, previous studies mainly focused on the in-service welding burn-through macro-criteria, which result in the lack of investigations into meso-and micro-scale high-temperature deformation behavior during the instability of in-service welding [2].…”

Section: Introductionmentioning

confidence: 99%

An Investigation into Microstructure Evolution and High-temperature Deformation Behavior during the Instability of In-service Welding

Han,

et al. 2024

J. Phys.: Conf. Ser.

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It is of great significance to reveal deformation behavior coupling with both the high-temperature effect and microstructure for the in-service welding instability zone. In the present paper, microstructure evolution and high-temperature deformation behavior at the representative temperatures 900 °C and 1100 °C inside the in-service welding instability zone were investigated based on the in-situ high-temperature laser scanning confocal microscope (LSCM). The results indicated that a sufficient condition of carbide precipitation is to hold it at 900 °C for a certain time. However, the phenomenon of carbide precipitation failed to be presented during continuous heating to 1150 °C. Although the slip and twining deformation occurred inside austenite grain, the fracture mechanism gave priority to intergranular cracking, which could be ascribed to the carbides with higher hardness and the grain boundary weakening caused by the temperature effect.

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“…Due to the forced constraint of the pipeline and the existence of a flowing high-pressure medium in the pipeline, there are two main technical difficulties for in-service welding: 1) burn-through instability 2) hydrogen cracking. Among them, burn-through instability is the primary problem to solve [2].…”

Section: Introductionmentioning

confidence: 99%

In situ observation of deformation and failure behavior in the burn-through instability zone of in-service welding

Zhang¹,

Han²,

Wang³

2023

AETR

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Based on the in-situ high-temperature SEM and laser scanning confocal microscope (LSCM), the high-temperature plastic deformation and failure behavior of X65 pipeline steel at 1000℃ and 1200℃ were studied in this paper, and the strain evolution behavior in this process was analyzed by DIC technology. In this study, the precipitation and dissolution of carbide at the austenite grain boundary were observed during the in situ heating process. The external load showed a great effect on the growth of the grains, and the grains grew rapidly by swallowing each other. The grain size, material performance, and misorientation played an important role during the deformation and crack evolution. At high temperatures, cracks were mainly initiated and propagated in the position with a large plastic strain. The strain concentration showed a significant effect on crack initiation.

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In-situ observation of high-temperature failure behavior of pipeline steel and investigation on burn-through mechanism during in-service welding

Cited by 10 publications

References 15 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

An Investigation into Microstructure Evolution and High-temperature Deformation Behavior during the Instability of In-service Welding

In situ observation of deformation and failure behavior in the burn-through instability zone of in-service welding

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