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Research Article

Microstructure and mechanical properties of ultralow carbon high-strength steel weld metals with or without Cu-Nb addition

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  • Received: 20 April 2020Revised: 5 August 2020Accepted: 6 August 2020Available online: 10 August 2020
  • Two kinds of ultralow carbon steel weld metals with and without added Cu-Nb were prepared by using gas metal arc welding (GMAW) to investigate the correlation between microstructure and mechanical properties of weld metals. Results of microstructure characterization show that weld metal without Cu-Nb is mainly composed of acicular ferrite (AF), lath bainite (LB), and granular bainite (GB). In contrast, adding Cu-Nb to weld metal causes an evident transformation of martensite and causes grain coarsening. Both weld metals have high tensile strength (more than 950 MPa) and more than 17% elongation; however, their values of toughness deviate greatly with a difference of approximately 40 J at -50℃. Analysis of morphologies of fracture surfaces and secondary cracks further revealed the correlation between microstructure and mechanical properties. The effects that adding Cu and Nb have on microstructure and mechanical properties of weld metal are discussed; the indication is that adding Cu-Nb increases both hardenability and grain size of weld metal and thus deteriorates the toughness.
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    [19] Hong-mei Zhang, Yan Li, Ling Yan, Fang-fang Ai, Yang-yang Zhu, and  Zheng-yi Jiang, The Effect of Large Load on the Wear and Corrosion Behavior of High-strength EH47 Hull Steel in 3.5wt%NaCl Solution with Sand, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-020-1978-3
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Microstructure and mechanical properties of ultralow carbon high-strength steel weld metals with or without Cu-Nb addition

  • Corresponding authors:

    Xiao-hua Chen    E-mail: chenxh@skl.ustb.edu.cn

    Zi-dong Wang    E-mail: wangzd@mater.ustb.edu.cn

  • 1. School of Material Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
  • 3.  State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China

Abstract: Two kinds of ultralow carbon steel weld metals with and without added Cu-Nb were prepared by using gas metal arc welding (GMAW) to investigate the correlation between microstructure and mechanical properties of weld metals. Results of microstructure characterization show that weld metal without Cu-Nb is mainly composed of acicular ferrite (AF), lath bainite (LB), and granular bainite (GB). In contrast, adding Cu-Nb to weld metal causes an evident transformation of martensite and causes grain coarsening. Both weld metals have high tensile strength (more than 950 MPa) and more than 17% elongation; however, their values of toughness deviate greatly with a difference of approximately 40 J at -50℃. Analysis of morphologies of fracture surfaces and secondary cracks further revealed the correlation between microstructure and mechanical properties. The effects that adding Cu and Nb have on microstructure and mechanical properties of weld metal are discussed; the indication is that adding Cu-Nb increases both hardenability and grain size of weld metal and thus deteriorates the toughness.

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