Effect of cooling conditions on microstructures and mechanical behaviors of reheated low-carbon weld metals

Mao, Gaojun; Cao, Rui; Cayron, Cyril; Mao, Xiuli; Logé, Roland E.; Chen, Jianhong

doi:10.1016/j.msea.2018.12.035

Cited by 16 publications

(2 citation statements)

References 63 publications

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“…[8][9][10] According to Babu's proposal, [11] invariant microstructure in the heat-affected zone (HAZ) and WM that corresponds to high-performance welded joints is regarded as a reference aim in the design of the welding process parameters. Mao et al [12] reported that designing a reasonable component ratio between lath bainite and acicular ferrite is the key to obtaining a low-carbon WM with excellent comprehensive mechanical properties. Wen et al [5] illustrated that the WM superior impact toughness is directly attributed to the fine grain size and highdensity dislocation of acicular ferrite.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Weld Metal Microstructure Evolution and Welding Process Parameters of Low Alloy Ferritic Steel Weldments

Zhang

Lan

Shi

2023

steel research int.

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This study attempts to propose a convenient method to adjust the welding process parameters window with the aim of high volume fraction of acicular ferrite in the weld metal (WM). The samples are directly extracted from the deposition zone of two low alloy ferritic steel dissimilar welded joints (DWJs) that manufactured using different consumables, and their microstructural evolution is controlled using thermomechanical simulation technique. The results show that it is hard for the low‐alloyed WM to obtain high amount of acicular ferrite no matter how to control the cooling process, meaning that the welding consumable with only a small amount of alloying elements is not suitable for welding this DWJ. However, for the high‐alloyed WM, the acceptable window of the cooling process is determined within 10–22 °C s−1 to achieve aimed microstructure. In situ observation shows that the preexisting bainitic laths significantly reduce the growth space of acicular ferrite plates. The average lengthening rate of acicular ferrite plates is ranged from ≈5 to ≈68 μm s−1 at a cooling rate of 3 °C s−1.

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Section: Introductionmentioning

confidence: 99%

Correlation between Weld Metal Microstructure Evolution and Welding Process Parameters of Low Alloy Ferritic Steel Weldments

Zhang

Lan

Shi

2023

steel research int.

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“…Up to now, the influence of thermal history has mainly been addressed through the effect of the cooling rate [12][13][14] or the welding parameters on the microstructural evolution of the weld metal [15][16][17]. However, the influence of peak temperature variations has rarely been reported in weld metal [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Thermal History on Macrostructure and Microstructure Development in High-Strength Steel Welds

Jousset

Gaumé

Bridier

et al. 2022

Metall Mater Trans A

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The present work addresses the microstructural and macrostructural development in multipass welded joints. It focuses on multiple thermal cycles induced by successive deposition of welding passes. The local welding-related thermal history was related in detail to the evolution of austenite grains during manufacturing of two high-strength low-alloy steel welds. The analytical Rosenthal thermal model was used to identify the thermal cycles experienced within typical weld metal regions. Selected heat cycles were applied to laboratory specimens, taken from the same weld metal, to investigate microstructural evolution during the welding process. Heat cycle experiments, involving full austenitization, showed the persistence of columnar zones resulting from a memory effect of the prior austenite grains during the reverse transformation. Intercritical heat cycles led to white-etching, softer regions with high fractions of retained austenite. They also showed that the memory of austenite grains was actually stored in elongated retained austenite particles that remained after complete welding. This memory effect vanished under high peak temperatures (typically, 130°C higher than Ac3); this was linked to a competition between growth and merging of elongated, intragranular retained austenite particles, and growth of equiaxed, intergranular austenite particles. Finally, a low peak temperature promoted refined, harder final microstructures.

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Effect of Deposition Strategies on the Microstructure and Tensile Properties of Wire Arc Additive Manufactured Al-5Si Alloys

Chen

Konovalov

et al. 2021

J. of Materi Eng and Perform

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Effect of cooling conditions on microstructures and mechanical behaviors of reheated low-carbon weld metals

Cited by 16 publications

References 63 publications

Correlation between Weld Metal Microstructure Evolution and Welding Process Parameters of Low Alloy Ferritic Steel Weldments

Correlation between Weld Metal Microstructure Evolution and Welding Process Parameters of Low Alloy Ferritic Steel Weldments

Effect of the Thermal History on Macrostructure and Microstructure Development in High-Strength Steel Welds

Effect of Deposition Strategies on the Microstructure and Tensile Properties of Wire Arc Additive Manufactured Al-5Si Alloys

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