Microstructure and impact toughness of offshore steel
Journal
Archives of Metallurgy and Materials
Journal Volume
63
Journal Issue
1
Pages
167-172
Date Issued
2018
Author(s)
Abstract
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.
Publisher
Polish Academy of Sciences
Type
journal article