Single-pass arc welding of thick plate structures of 22K steel under a thin slag layer

Poletaev, Y. V.; Poletaev, Valery Yu.; Khubiev, A. E.

doi:10.1080/09507116.2017.1388045

Cited by 4 publications

(1 citation statement)

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“…The results of the performed studies of the mechanism of local fractures show [6][7][8] that they are caused primarily by the sensitivity of steel to the thermal deformation cycle of welding and heat treatment, as well as the development of the process of intergranular fracture during creep of the welded joint under high-temperature operation. Processes that contribute to a sharp decrease in the strength of grain boundaries can be combined into two groups:…”

Section: Introductionmentioning

confidence: 99%

Experimental methods for assessing the propensity of welded joints to local fault

Poletaev

Shchepkin²

2023

E3S Web of Conf.

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The problem of increasing the resistance of welded joints of power equipment against local destruction in the conditions of non-stationary mode of high-temperature operation is relevant. In the studies performed, the analysis of the causes and nature of LR was carried out from the standpoint of classical physics of high-temperature deformation and intergrain destruction by the creep mechanism. Most of the test methods developed simulate just such loading conditions. However, the most objective assessment of the susceptibility of the welded joints to LR can be given by the method of testing welded joints under conditions of high-temperature low-frequency low-cycle loading.

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Section: Introductionmentioning

confidence: 99%

Experimental methods for assessing the propensity of welded joints to local fault

Poletaev

Shchepkin²

2023

E3S Web of Conf.

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Low-Cycle Fatigue of the Weld Metal of a Low-Carbon Steel Welded Joint after High-Temperature Action

Nikulin,

Rogachev,

Belov

et al. 2023

Russ. Metall.

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Influence of long-term high-temperature action on impact toughness of base metal and weld metal of 22K steel welded joint

Nikulin

Рогачев

Белов

et al. 2021

Izv. vysš. učebn. zaved., Čern. metall.

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One of the applications of construction low-carbon 22K steel (AISI 1022 type) is as a material for the vessel of a core catcher (CC) for nuclear power plants with VVER reactors. In the event of severe beyond design basis accident, the CC-vessel will be under conditions of prolonged hightemperature impacts, which can significantly change the structural state and lead to degradation of mechanical properties of the vessel material. Data on the effect of such actions on the mechanical properties and fracture resistance of welds (the properties of which usually differ from those of the base metal) from low-carbon steels are very limited in the literature. This makes it difficult to guarantee the reliability and safety prediction of CC. The purpose of this work was to carry out the comparative Charpy V-notch impact tests of the samples of base metal and weld metal of the 22K steel welded joint before and after long-term high-temperature heat treatment, simulating the thermal effect on the reactor vessel material of nuclear power plants during severe accidents. Welded joints of 22K steel sheets were obtained by the method of automatic argon-arc welding with a consumable electrode (welding wire SV-08G2S was used) in accordance with PNAE G-7-009–89. Based on the test results, the ductile–brittle transition curves were plotted and analysis of fracture surfaces after tests was carried out. The influence of structural factors on the impact toughness has been studied. It is shown that prolonged high-temperature exposure leads to an increase in the temperatures of beginning and end of the ductile-brittle transition by 30 – 50 °C and to the expansion of range of the ductile-brittle transition temperature by 15 – 25 °C of both base metal and weld metal of the welded joint.

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Single-pass arc welding of thick plate structures of 22K steel under a thin slag layer

Cited by 4 publications

References 0 publications

Experimental methods for assessing the propensity of welded joints to local fault

Experimental methods for assessing the propensity of welded joints to local fault

Low-Cycle Fatigue of the Weld Metal of a Low-Carbon Steel Welded Joint after High-Temperature Action

Influence of long-term high-temperature action on impact toughness of base metal and weld metal of 22K steel welded joint

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