18.97.14.90
18.97.14.90
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SCIE SCOPUS
저 탄소형 Ti - B 첨가강 강도와 인성에 미치는 B 의 영향 (2) ( 용접열영향부 인성 및 균열감수성 )
Research Paper - Welding & Joining - : Influence of B on the Strength and Toughness of Low - Carbon Type Ti - B Containing Steels (2) ( Toughness and Crack Susceptibility of Heat - Affected Zone )
방국수(Kook Soo Bang), 안영호(Young Ho Ahn)
UCI I410-ECN-0102-2008-580-001802638

Using the thermodynamic model between TiN-BN-AlN in austenite, simulated heat-affected zone impact toughness of low-carbon type Ti-B containing steels was investigated. HAZ toughness was dependent on microstructure which was determined by the soluble boron to soluble nitrogen ratio at the welding peak temperature, 1350℃. Only when the soluble boron to soluble nitrogen ratio is kept below 0.2, HAZ showed ferrite dominant microstructure and had absorbed energy higher than 100J at - 20℃. It was shown that soluble boron combined with soluble nitrogen to 50rm boron nitrides during welding cooling cycle, resulting in a reduction of effective boron influencing the hardenability of HAZ. Compared to the conventional steels, low-carbon steels with a controlled soluble boron to soluble nitrogen ratio showed excellent HAZ toughness and no cold-cracking without preheating.

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