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Microstructure and Impact Toughness of Offshore Steel

Cheng T.-C., Yu C., Yang T.-C., Huang C.-Y., Lin H.-C., Shiue R.-K.

Archives of Metallurgy and Materials

2018

Vol. 63, iss. 1

167--172

This study focused on the effects of microstructures on the low-temperature impact toughness of directly water-quenched offshore steel. Martensite dominated the microstructure directly below the quenched surface. In contrast, mainly lower bainite, martensite, and low amount of ferrite were observed in the central region of the quenched specimen. The ductile to brittle transition temperature of tempered martensite was significantly lower than that of a bainite-dominated microstructure. It is found that low-angle boundaries within the bainite packets greatly impair the low-temperature impact toughness of the steel. The absence of high-angle boundaries in the lower bainite packets significantly deteriorates the low-temperature impact energy of offshore steel.