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Microstructure and Mechanical Properties of 316L Stainless Steel Filling Friction Stir-Welded Joints

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Abstract

Keyhole left at 316L stainless steel friction stir welding/friction stir processing seam was repaired by filling friction stir welding (FFSW). Both metallurgical and mechanical bonding characteristics were obtained by the combined plastic deformation and flow between the consumable filling tool and the wall of the keyhole. Two ways based on the original conical and modified spherical keyholes, together with corresponding filling tools and process parameters were investigated. Microstructure and mechanical properties of 316L stainless steel FFSW joints were evaluated. The results showed that void defects existed at the bottom of the refilled original conical keyhole, while excellent bonding interface was obtained on the refilled modified spherical keyhole. The FFSW joint with defect-free interface obtained on the modified spherical keyhole fractured at the base metal side during the tensile test due to microstructural refinement and hardness increase in the refilled keyhole. Moreover, no σ phase but few Cr carbides were formed in the refilled zone, which would not result in obvious corrosion resistance degradation of 316L stainless steel.

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Acknowledgments

The work was funded by the “Innovative Nuclear Research and Development Program” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

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Author notes

  1. M. Morimoto

    Present address: ITER Superconducting Magnet Technology Group, Division of ITER Project, Japan Atomic Energy Agency, Naka, 311-0193, Japan

Authors and Affiliations

  1. Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan

    L. Zhou, K. Nakata, T. Tsumura, H. Fujii & K. Ikeuchi

  2. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai, 264209, China

    L. Zhou

  3. Manufacturing Technology Center, Mitsubishi Heavy Industries, Ltd., Takasago, 676-8686, Japan

    Y. Michishita & Y. Fujiya

  4. Advanced Nuclear Plant Designing Section, Mitsubishi Heavy Industries, Ltd., Kobe, 652-8585, Japan

    M. Morimoto

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  1. L. Zhou
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Correspondence to L. Zhou.

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Zhou, L., Nakata, K., Tsumura, T. et al. Microstructure and Mechanical Properties of 316L Stainless Steel Filling Friction Stir-Welded Joints. J. of Materi Eng and Perform 23, 3718–3726 (2014). https://doi.org/10.1007/s11665-014-1124-3

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  • DOI: https://doi.org/10.1007/s11665-014-1124-3

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