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Effect of Solidification Segregation on Microstructure and Mechanical Properties of a Ni-Cr-Mo-V Steel Weld Metal

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Abstract

The effects of solute elements segregation during solidification on microstructure evolution and mechanical properties of a Ni-Cr-Mo-V rotor weld metal were studied. The alloy elements, such as Mn and Ni, segregated at inter-dendritic (ID) region, resulting in microstructural inhomogeneity between ID and dendritic core (DC) region. The microstructure of ID and DC region was characterized in detail by transmission electron microscopy (TEM) and transmission electron backscatter diffraction (T-EBSD). The results showed that the microstructure of ID region was composed of untempered martensite and retained austenite, while the bainite and ferrite were found at DC region. Two morphologies of retained austenite, film-like and blocky, were formed at different nucleation sites within ID region. The film-like retained austenite distributed at low-angle martensite lath boundaries held a near Nishiyama–Wasserman (N–W) orientation relationship with its surrounding untempered martensite lath, while the blocky retained austenite distributed at high-angle boundaries held no special orientation relationship with surrounding matrix. The segregation behavior of alloy elements was analyzed by Scheil solidification simulation. The formation mechanism of untempered martensite and retained austenite was proposed and the effects of ID segregation on impact toughness and hardness were discussed.

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Acknowledgments

This work was supported by National Key R&D Program of China (Nos. 2020YFA0714900), the Defense Industrial Technology Development Program (JCKY2020110B007), and National Natural Science Foundation of China (No. 52031003).

Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, P.R. China

    Chaoyu Han, Qu Liu, Zhipeng Cai, Kejian Li & Jiluan Pan

  2. Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing, 100084, P.R. China

    Chaoyu Han, Qu Liu, Zhipeng Cai, Kejian Li & Jiluan Pan

  3. State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, P.R. China

    Zhipeng Cai

  4. Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing, 100084, P.R. China

    Zhipeng Cai

  5. Shanghai Electric Power Generation Equipment Co., Ltd., Shanghai, P.R. China

    Xin Huo & Manjie Fan

  6. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150006, P.R. China

    Kejian Li

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  1. Chaoyu Han
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Correspondence to Kejian Li.

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Manuscript submitted August 8, 2021; January 9, 2022.

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Han, C., Liu, Q., Cai, Z. et al. Effect of Solidification Segregation on Microstructure and Mechanical Properties of a Ni-Cr-Mo-V Steel Weld Metal. Metall Mater Trans A 53, 1394–1406 (2022). https://doi.org/10.1007/s11661-022-06600-w

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  • DOI: https://doi.org/10.1007/s11661-022-06600-w

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