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Microstructure and Mechanical Properties of Resistance Spot Welding Joints of Carbonitrided Low-Carbon Steels

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Abstract

Carbonitrided low-carbon steels are resistance welded in various engineering components. However, there are no reports on the microstructure and mechanical properties of their resistance spot welding (RSW) joints. Therefore, various carbonitridings were performed on the low-carbon steel sheets, and then various RSWs were applied to these carbonitrided sheets. The metallurgical and mechanical properties of the welding joint were investigated and discussed. The peak load and failure energy increased with the increases of welding current and fusion zone (FZ) size. At 11 kA welding current, the carbonitrided steel joint had the failure energy of 16 J, i.e., approximately 84 pct of untreated steel joint. FZ of carbonitrided steel joint consisted of ferrite, Widmanstatten ferrite, and untempered martensite, i.e., the solid-state transformation products, while the microstructure at the outer surfaces consisted of untempered martensite and retained austenite. The surface hardening of carbonitrided steel after RSW could be maintained, i.e., approximately 810 HV. The results can be applied to carbonitriding and RSW to achieve a good welding joint.

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Acknowledgments

The authors would like to acknowledge the support from Dr. Patiphan Juijerm (Kasetsart University, Thailand), the Thailand Research Fund, the Thailand Commission on Higher Education of Thailand (National Research University Project), the National Research Council of Thailand (NRCT), and the National Metal and Materials Technology Center (MTEC, Thailand).

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Authors and Affiliations

  1. Center of Materials Engineering and Performance, Department of Mechanical Engineering, Thammasat University, Klong-Luang, Pathumthani, 12120, Thailand

    Nipon Taweejun & Chaosuan Kanchanomai

  2. School of Manufacturing Engineering, Institute of Engineering, Suranaree University of Technology, Muang District, Nakhon Ratchasima, 30000, Thailand

    Piyamon Poapongsakorn

Authors
  1. Nipon Taweejun
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  2. Piyamon Poapongsakorn
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  3. Chaosuan Kanchanomai
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Corresponding author

Correspondence to Chaosuan Kanchanomai.

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Manuscript submitted March 10, 2016.

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Taweejun, N., Poapongsakorn, P. & Kanchanomai, C. Microstructure and Mechanical Properties of Resistance Spot Welding Joints of Carbonitrided Low-Carbon Steels. Metall Mater Trans B 48, 1174–1187 (2017). https://doi.org/10.1007/s11663-017-0927-7

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  • DOI: https://doi.org/10.1007/s11663-017-0927-7

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