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SU Xiaohu, LI Zhuoxin, LI Hong, JinKim Hee, MENG Bo. Microstructure to properties of coarse grained heat affected zone in deposited weld metal of metal cored wire E120C-K4[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(10): 48-53. DOI: 10.12073/j.hjxb.2019400262
Citation: SU Xiaohu, LI Zhuoxin, LI Hong, JinKim Hee, MENG Bo. Microstructure to properties of coarse grained heat affected zone in deposited weld metal of metal cored wire E120C-K4[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(10): 48-53. DOI: 10.12073/j.hjxb.2019400262
shu

Microstructure to properties of coarse grained heat affected zone in deposited weld metal of metal cored wire E120C-K4

  • 1.

    Beijing University of Technology, Beijing 100124, China

  • 2.

    Advanced Joining Research Team, Korea Institute of Industrial Technology, Cheonan-si 330-825, Korea

  • 3.

    Shandong JuLi Welding Co., Ltd., Dezhou 253000, China

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  • Received Date: August 20, 2018
  • Available Online: July 12, 2020
    Graphical Abstract
    • Abstract
  • The effect of microstructure as a function of welding cooling time (t8/5) from 800 °C to 500 °C on the impact toughness of coarse grained heat affected zone (CGHAZ) of deposited metal of metal cored wire E120C-K4 was investigated by welding thermal simulation. The results showed that the microstructure of CGHAZ was mainly composed of degenerate upper bainite (DUB) granular bainite (GB) and Acicular ferrite(AF) at t8/5 from 6 s to 12 s, forming the interlace multiphase microstructure, then the optimal impact toughness was obtained. The microstructure of CGHAZ formed with granular bainite (GB) and Acicular ferrite(AF) and the impact toughness decreased when t8/5 from 30 s to 120 s. The absorbed energy of CGHAZ was only 24 J at −40 °C at t8/5 of 120 s, the worst impact toughness. The key of improving impact toughness at t8/5 from 6 s to 12 s was: ① forming the interlace multiphase microstructure; ② refining grains; ③ more high-angle grain boundaries per unit distance.
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    • References (17)
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