Influence of Long-Term Subcritical Annealing on the Unalloyed Steel Welded Joint Microstructure

Fajt, Dominika; Maślak, Mariusz; Stankiewicz, Marek; Zajdel, Paulina; Pańcikiewicz, Krzysztof

doi:10.3390/ma16010304

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…Finally, the fusion zone is similar to a typical fusion zone as seen in many welded steels [15], as it is formed of elongated ferritic grains as indicated by the yellow circle and Widmanstätten ferrite (αw). As mentionned by Fajt et al [16] the microstructure in fusion zone which has been heated above the liquidus temperature is characterized by a typical casting structure.…”

Section: Microstructurementioning

confidence: 93%

Thermal Cycle Simulation of Heat Affected Zone in the Welded Mild Steel

Hamdi,

Boumerzoug,

Bedjaoui

et al. 2024

KEM

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The aim of this work was to study the microstructure evolution of simulated heat affected zone in mild steel using thermal cycle simulation and it was compared to the heat affected zone in the real welded joint. The optical microscopy, micro-hardness measurements, X-ray diffraction were used as characterization techniques. The microstructures and mechanical properties of the simulated heat affected zone were also determined. The use of the thermal cycle simulation technique revealed in detail the different microstructures in the heat affected zone (HAZ) of the welded joint. Some similarities were observed between the heat affected zone obtained by the thermal cycle simulation technique and the heat affected zone observed in the real welded joint. The thermal cycle simulation technique revealed more details about the microstructure and mechanical behavior of the heat-affected zone. The HAZ microhardness values were lowest hardness in the welded joint. Moreover, the lowest hardness value is obtained for the HAZ simulated at 850°C.

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Section: Microstructurementioning

confidence: 93%

Thermal Cycle Simulation of Heat Affected Zone in the Welded Mild Steel

Hamdi,

Boumerzoug,

Bedjaoui

et al. 2024

KEM

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“…These issues are particularly important during welding of metals of limited weldability, especially in extreme conditions: arctic, field (e.g. during the fabrication of transmission pipelines) and under water [5][6][7][8][9]. Welding under water can be carried out using the dry method, local dry cavity or with direct contact of the welding area with water [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Arc Strikes on High Strength Low Alloy Steels Welded by SMAW

Fydrych,

Raczko,

Świerczyńska

et al. 2023

Adv. Sci. Technol. Res. J.

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Wet welding with covered electrodes (Shielded Metal Arc Welding -SMAW) is the most commonly used method of carrying out welding repair works in a water environment. Limited visibility and the inability to move freely under water result in an increased risk of formation of welding imperfections such as lack of fusion, lack of penetration and arc strikes. The work focused on changes in the properties and structure of steel subjected to the impact of short (0.2 s) arc ignitions generated by covered electrodes in air and under water for three high strength steel grades: S460N, S460M and S500MC. Visual tests, macroscopic and microscopic metallographic tests, microhardness measurements and diffusible hydrogen content in deposited metal determination were performed. A significant influence of the environment on changes in the morphology and microhardness of steel in the vicinity of arc strikes was found. The microhardness of the areas covered by the rapid thermal cycle caused by SMAW increased from 200-230 HV0.5 to 400-500 HV0.5 depending on the steel grade. The presence of welding imperfections: cavities and cracks were detected. The susceptibility of all steel grades subjected to short thermal cycles to cracking was confirmed by the results of measurements of the diffusible hydrogen content: 38.6 ml/100 g and 84.5 ml/100 g for air and water environment, respectively. No influence of changes in the welding current on the behavior of the material in the tested conditions was found. The conducted research shows that leaving arc strikes on the structure may have serious consequences and cause a failure.

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Influence of Long-Term Subcritical Annealing on the Unalloyed Steel Welded Joint Microstructure

Cited by 2 publications

References 36 publications

Thermal Cycle Simulation of Heat Affected Zone in the Welded Mild Steel

Thermal Cycle Simulation of Heat Affected Zone in the Welded Mild Steel

Effect of Arc Strikes on High Strength Low Alloy Steels Welded by SMAW

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