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Investigation of the Microstructure of Laser-Arc Hybrid Welded Boron Steel

  • Characterization of Advanced High Strength Steels for Automobiles
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Abstract

The microstructure of boron steel for automotive driving shaft manufacturing after laser-arc hybrid welding was investigated. Laser-arc hybrid welding technology was applied to 3-mm-thick plates of boron steel, ST35MnB. The temperature distribution of the welding pool was analyzed using the finite element method, and the microstructure of the welded boron steel was characterized using optical microscopy and scanning and transmission electron microscopies. The microstructure of the weld joint was classified into the fusion zone, the heat-affected zone (HAZ), and the base material. At the fusion zone, the bainite grains exist in the martensite matrix and show directionality because of heat input from the welding. The HAZ is composed of smaller grains, and the hardness of the HAZ is greater than that of the fusion zone. We discuss that the measured grain size and the hardness of the HAZ originate from undissolved precipitates that retard the grain growth of austenite.

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Acknowledgements

This work was support by the Industrial Strategic Technology Development Program No. 10048332, “Development of forming technology for lightweight integrated drive shaft assembly using variable cross-section tube” funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea

    Seungwoo Son & Zonghoon Lee

  2. Department of Mechanical Engineering, Chung-Ang University, Seoul, 06974, Republic of Korea

    Young Ho Lee & Youngseog Lee

  3. Materials Deformation Department, Korea Institute of Materials Science, Changwon, Gyeongnam, 51508, Republic of Korea

    Seong-Hoon Kang

  4. Sungwoo Hitech Co., Ltd, Yangsan, Gyeongnam, 50511, Republic of Korea

    Dong-Won Choi & Kuk-Rae Cho

  5. Korea Flange Co., Ltd, Ulsan, 44007, Republic of Korea

    Seung Man Shin

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  1. Seungwoo Son
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Correspondence to Zonghoon Lee.

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Son, S., Lee, Y.H., Choi, DW. et al. Investigation of the Microstructure of Laser-Arc Hybrid Welded Boron Steel. JOM 70, 1548–1553 (2018). https://doi.org/10.1007/s11837-018-2876-2

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  • DOI: https://doi.org/10.1007/s11837-018-2876-2