| METALS AND METAL MATRIX COMPOSITES |
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| Nucleation Mechanism of Bainite Laths in High-strength Melted Metal and Its Effect on Mechanical Properties |
| LIU Jingwu*, DU Yi, SUN Lei, WANG Xinghua, FU Hongliang, ZHANG Hao, WANG Renfu
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| Luoyang Ship Material Research Institute, Luoyang 471000, Henan, China |
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Abstract Welding constitutes a critical processing technology in the construction of offshore equipment, and enhancing the strength-toughness balance ofmelted metals is pivotal for ensuring the safe operation of such equipment. In this study, two types of welding wires with varying chromium contents were developed and utilized for metal active gas shielded arc welding. Microstructure and crystallographic characteristics of the melted metals were systematically analyzed using multi-scale techniques, and the findings revealed that the microstructure of the melted metals primarily comprises bainite lath. With the incorporation of 0.18wt% chromium, the transformation temperature of bainite decreased while its transformation rate increased. Furthermore, the nucleation mechanism of bainite laths transformed from autocatalytic nucleation to classical grain boundary nucleation, leading to a shift from interwoven bainite lath to parallel bainite lath microstructures. Mechanical property evaluations indicated that the yield strength of the melted metals exceeds 940 MPa. Notably, melted metals characterized by classical grain boundary nucleation exhibited reduced crack resistance due to fewer high-angle grain boundaries, resulting in significantly lower impact absorption energy (45 J at -50 ℃) compared to those featuring autocatalytic nucleation (120 J). It can be concluded that, by appropriately modulating the nucleation method of bainite laths, an optimal balance between strength and toughness can be achieved for high-strength melted metals.
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Published: 10 November 2025
Online: 2025-11-10
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2025, Vol. 39 
