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J Weld Join > Volume 42(5); 2024 > Article
Journal of Welding and Joining 2024;42(5):458-462.
DOI: https://doi.org/10.5781/JWJ.2024.42.5.2    Published online October 31, 2024.
Revisiting the Concept of Property Optimization of Low Temperature Phase Transformed Microstructures of GIGASTEEL Welds
Gyuyeol Bae1  , Joonoh Moon2  , Bo-Young Jeong1 
1Steel Solution Research Lab., Technical Research Lab., POSCO, Songdo, 21998, Korea
2Department of Materials Convergence and System Engineering, Changwon National University, Changwon, 51140, Korea
Correspondence:  Gyuyeol Bae,
Email: gbae@posco.com
Received: 6 October 2024   • Revised: 21 October 2024   • Accepted: 24 October 2024
Abstract
Although the need for automobile lightening continues to increase in preparation for the era of electrical vehicles, the application of steel, which has strengths in price and recycling in the automotive industry, is expected to continue along with the developments of various driving energy sources. Recently, when lightening and stiffness reinforcement are required for the electric vehicles or medium and large SUVs, newly-designed parts using GIGASTEEL with a tensile strength of 980MPa or higher are being developed. However, it is difficult to secure sufficient weld strength and fatigue performances when applying welding consumables that have been applied normally and ultra-high strength welding materials that have been commercialized so far. It has also limitations that are not easy to apply due to excessive manufacturing costs in the automotive industry. In this study, the application of commercial welding consumables by strength grade to GIGASTEEL was reviewed and the properties of the weldments were compared to address all of the above issues. Here, we consider the effects of C, Mn, Si, Cr, Ni, Mo and microalloying to implement interlocked nature with dense and complex microstructures of lath-like bainitic and acicular ferrite that can effectively improve both strength and toughness of GIGASTEEL welds in a more economical way.
Key Words: GIGASTEEL, Welds, Low temperature transformation, Acicular ferrite, Lath-like microstructures
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ORCID iDs

Gyuyeol Bae
https://orcid.org/0000-0002-2803-0119

Joonoh Moon
https://orcid.org/0000-0002-9171-1953

Bo-Young Jeong
https://orcid.org/0000-0003-3974-5934

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