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ZHENG Shaoxian, ZENG Daoping, MENG Qian, ZHAO Xilong, LI Jinmei. Formation mechanism analysis of the type-II boundary of dissimilar steel joint with the filler metal of ER309[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(4): 56-61. DOI: 10.12073/j.hjxb.20200902001
Citation: ZHENG Shaoxian, ZENG Daoping, MENG Qian, ZHAO Xilong, LI Jinmei. Formation mechanism analysis of the type-II boundary of dissimilar steel joint with the filler metal of ER309[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(4): 56-61. DOI: 10.12073/j.hjxb.20200902001
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Formation mechanism analysis of the type-II boundary of dissimilar steel joint with the filler metal of ER309

  • 1.

    Lanzhou Jiaotong University, Lanzhou, 730070, China

  • 2.

    Lanzhou LS Test Technology Co., Ltd, Lanzhou, 730314, China

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  • Received Date: September 01, 2020
  • Available Online: March 30, 2021
    Graphical Abstract
    • Abstract
  • Formation mechanism of the type-II boundary of 1Cr18Ni9Ti/Q235 dissimilar steel joint with the filler metal of ER309 was studied. The results showed that the type-II boundary was formed by the migration of the solidified boundaries γ/γ from the position of the 5% ~ 6% Ni mass fraction in the unmixed zone to weld center. Under the condition that the partial fusion zone and the zone of Ni mass fraction less than 5% ~ 6%(N zone) in the unmixed zone provided the substrate of δ phase, or the partial fusion zone provided the substrate of γ phase and N zone provided the substrate of δ phase, the type-II boundary all could form near the fusion boundary of the carbon steel side. The type-II boundary could not form under the condition that the partial fusion zone provided the substrate of δ phase and N zone provided the substrate of γ phase, or the partial fusion zone and N zone provided the substrate of γ phase.
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    • References (13)
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