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Microstructures and mechanical properties of 30Cr-4Mo ferritic stainless steel joints produced by double-pulsed gas metal arc welding

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Abstract

Joining of medium-thick ferritic stainless steel (FSS) traditionally follows the protocol of multi-layer and multi-pass welding to avoid massive grain coarsening in the heat-affected zone (HAZ). In this study, an attempt has been made to join 5-mm-thick 30Cr-4Mo FSS with single pass using double-pulsed gas metal arc welding (DP-GMAW) process employing ERNiCr-3 Ni-based filler. Defect-free joints were made under optimized welding parameters. Microstructural examination elucidated that mean grain size number of HAZ was successfully controlled above 3 due to the relatively low heat input of DP-GMAW. A linear relation between width of HAZ and heat input was found and given. In HAZ, no sigma (σ) phase, chi (χ) phase, or Laves phase was detected, and even-distributed (Ti, Nb)(C, N) precipitates presented mostly inside grains, which significantly kept the integrity of grain boundaries to preserve ductility. Ni-based filler greatly improved the ductility of welds as well. In the fusion zone (FZ), some dispersed white Nb-rich carbides have been observed and columnar dendrites turned into equiaxed dendrites near the centerline of FZ. All specimens qualified the bending test indicating favorable ductility of welded joints.

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Authors and Affiliations

  1. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin, 300072, China

    Heng Zhang, Shengsun Hu, Junqi Shen & Li Ma

  2. School of Materials Science and Engineering, Tianjin University, Room C0804, Building 25, Weijin Road 92, Nankai District, Tianjin, 300072, People’s Republic of China

    Heng Zhang, Shengsun Hu, Junqi Shen & Li Ma

  3. Baosteel Research Institute, Baoshan Iron & Steel Co., Ltd, Shanghai, 200941, China

    Li Ma

  4. National Defense Key Laboratory for Remanufacturing Technology, Academy of Armored Force Engineering, Beijing, 100072, China

    Fengliang Yin

Authors
  1. Heng Zhang
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  2. Shengsun Hu
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  3. Junqi Shen
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  4. Li Ma
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  5. Fengliang Yin
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Correspondence to Junqi Shen.

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Zhang, H., Hu, S., Shen, J. et al. Microstructures and mechanical properties of 30Cr-4Mo ferritic stainless steel joints produced by double-pulsed gas metal arc welding. Int J Adv Manuf Technol 80, 1975–1983 (2015). https://doi.org/10.1007/s00170-015-7173-4

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  • DOI: https://doi.org/10.1007/s00170-015-7173-4

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