V微合金化对Q355钢在不同热输入下焊接性能的影响机理研究

doi:10.11896/cldb.24100146

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Abstract The effect of V microalloying on the welding performance of Q355 steel at different heat inputs was investigated using advanced characterization techniques, including thermo-mechanical simulator (Gleeble), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). The results show that under a welding heat input of 40—100 kJ/cm, the addition of 0.03% V adversely affects the low-temperature impact toughness of the steel. When the heat input is 20 kJ/cm, the addition of 0.03% V improves the low-temperature impact toughness at -40 ℃ by 15.3 J. Detailed analysis shows that at a heat input of 40—75 kJ/cm, the addition of 0.03% V suppresses the formation of acicular ferrite, while at a heat input of 100 kJ/cm, it leads to abnormally coarse grains in the experimental steel, significantly deteriorating impact toughness. At a heat input of 20 kJ/cm, the addition of 0.03% V enhances the hardenability of the steel. The pinning effect of MC particles on austenite grain boundaries refines austenite grains, facilitating the nucleation and growth of martensite. This contributes to a more dispersed distribution of M/A islands, reducing the likelihood of M/A islands at grain boundaries becoming crack initiation sites. Moreover, at a heat input of 20 kJ/cm, the presence of numerous fine MC particles in the heat-affected zone (HAZ) increases the precipitation strengthening contribution (σ_p), significantly enhancing the hardness of the HAZ and achieving an optimal balance between strength and toughness.

Key words： V microalloying welding low-temperature toughness hardness mechanism of influence

Published: 25 November 2025 Online: 2025-11-14

CLC number:	TG142.41
	TG115.285

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	Articles by authors
	JIANG Chunhui
	LI Zhaodong
	GAO Bo
	ZHU Lu
	WANG Yinpeng
	WEI Wei

Cite this article:

JIANG Chunhui,LI Zhaodong,GAO Bo, et al. Mechanism Study on the Effect of V Microalloying on the Welding Performance of Q355 Steel Under Different Heat Inputs[J]. Materials Reports, 2025, 39(22): 24100146-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24100146 OR https://www.mater-rep.com/EN/Y2025/V39/I22/24100146

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