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Ultrastrong and ductile steel welds achieved by fine interlocking microstructures with film-like retained austenite

Author

Listed:
  • Joonoh Moon

    (Changwon National University)

  • Gyuyeol Bae

    (Steel Solution Research Lab., Technical Research Lab., POSCO)

  • Bo-Young Jeong

    (Steel Solution Research Lab., Technical Research Lab., POSCO)

  • Chansun Shin

    (Myongji University)

  • Min-Ji Kwon

    (Changwon National University)

  • Dong-Ik Kim

    (Energy Materials Research Center, Korea Institute of Science and Technology)

  • Dong-Jun Choi

    (Energy Materials Research Center, Korea Institute of Science and Technology)

  • Bong Ho Lee

    (Advanced Analysis Team, Inst. of Next-Generation Semicond. Convergence Technol., Daegu Gyeongbuk Institute of Science and Technology)

  • Chang-Hoon Lee

    (Steel Department, Korea Institute of Materials Science)

  • Hyun-Uk Hong

    (Changwon National University)

  • Dong-Woo Suh

    (Pohang University of Science and Technology)

  • Dirk Ponge

    (Max-Planck-Institut für Eisenforschung)

Abstract

The degradation of mechanical properties caused by grain coarsening or the formation of brittle phases during welding reduces the longevity of products. Here, we report advances in the weld quality of ultra-high strength steels by utilizing Nb and Cr instead of Ni. Sole addition of Cr, as an alternative to Ni, has limitations in developing fine weld microstructure, while it is revealed that the coupling effects of Nb and Cr additions make a finer interlocking weld microstructures with a higher fraction of retained austenite due to the decrease in austenite to acicular ferrite and bainite transformation temperature and carbon activity. As a result, an alloying design with Nb and Cr creates ultrastrong and ductile steel welds with enhanced tensile properties, impact toughness, and fatigue strength, at 45% lower material costs and lower environmental impact by removing Ni.

Suggested Citation

  • Joonoh Moon & Gyuyeol Bae & Bo-Young Jeong & Chansun Shin & Min-Ji Kwon & Dong-Ik Kim & Dong-Jun Choi & Bong Ho Lee & Chang-Hoon Lee & Hyun-Uk Hong & Dong-Woo Suh & Dirk Ponge, 2024. "Ultrastrong and ductile steel welds achieved by fine interlocking microstructures with film-like retained austenite," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45470-1
    DOI: 10.1038/s41467-024-45470-1
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    References listed on IDEAS

    as
    1. Masaki Taneike & Fujio Abe & Kota Sawada, 2003. "Creep-strengthening of steel at high temperatures using nano-sized carbonitride dispersions," Nature, Nature, vol. 424(6946), pages 294-296, July.
    2. Yanan Hu & Shengchuan Wu & Yi Guo & Zhao Shen & Alexander M. Korsunsky & Yukuang Yu & Xu Zhang & Yanan Fu & Zhigang Che & Tiqiao Xiao & Sergio Lozano-Perez & Qingxi Yuan & Xiangli Zhong & Xiaoqin Zeng, 2022. "Inhibiting weld cracking in high-strength aluminium alloys," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
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