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Study on Microstructure Characterization and Impact Toughness in the Reheated Coarse-Grained Heat Affected Zone of V-N Microalloyed Steel

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Abstract

Ultra-fine grained ferrite and V(C, N) precipitates formed in the welding process are important factors affecting the toughness of welded joints. In this paper, the microstructure evolution and mechanical properties of heat affected zone were investigated by welding thermal cycle simulation experiment. The effect of V(C, N) precipitates on microstructure and mechanical properties of reheating coarse grain heat affected zone was analyzed. The results showed that the dispersed V(C, N) precipitates can effectively motivate ferrite nucleation. The distribution of large angle grain boundary is more dense at the fine ferrite grain boundaries. The fine polygonal ferrite increases the percentage content of large angle grain boundaries, provides greater resistance to cleavage fracture and increases impact toughness. Because V(C, N) precipitates refine the M–A component, so the size is less than 1 μm. In addition, V(C, N) precipitates enrich carbon, therefore the content of carbon in M–A component is reduced, the hardness is decreased and the toughness is improved. It has a good inhibition effect on the formation and propagation of cracks.

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Acknowledgments

This work was financially supported by the Fundamental Research Funds for the Central Universities (N2107013).

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Authors and Affiliations

  1. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China

    Hongyan Wu, Dengliang Xia, Yu Du, Cairu Gao, Xiuhua Gao & Linxiu Du

  2. Hangzhou Hikfire Technology Co., Ltd, Hangzhou, 310051, China

    Dengliang Xia

  3. Technical Center of Laiwu Branch of Shandong Iron and Steel Co., Ltd, Laiwu, 271100, China

    Heng Ma

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  1. Hongyan Wu
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  2. Dengliang Xia
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  3. Heng Ma
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  4. Yu Du
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  7. Linxiu Du
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Correspondence to Hongyan Wu or Linxiu Du.

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Wu, H., Xia, D., Ma, H. et al. Study on Microstructure Characterization and Impact Toughness in the Reheated Coarse-Grained Heat Affected Zone of V-N Microalloyed Steel. J. of Materi Eng and Perform 31, 376–382 (2022). https://doi.org/10.1007/s11665-021-06178-1

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  • DOI: https://doi.org/10.1007/s11665-021-06178-1

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