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

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 and Dirk Ponge
Additional contact information
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

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-45470-1

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