首页|Unraveling the significance of cobalt on transformation kinetics,crystallo-graphy and impact toughness in high-strength steels
Unraveling the significance of cobalt on transformation kinetics,crystallo-graphy and impact toughness in high-strength steels
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This work reveals the significant effects of cobalt(Co)on the microstructure and impact toughness of as-quenched high-strength steels by experimental characterizations and thermo-kinetic analyses.The results show that the Co-bearing steel exhibits finer blocks and a lower ductile-brittle transition temperature than the steel without Co.Moreover,the Co-bearing steel reveals higher trans-formation rates at the intermediate stage with bainite volume fraction ranging from around 0.1 to 0.6.The improved impact toughness of the Co-bearing steel results from the higher dense block boundaries dominated by the V1/V2 variant pair.Furthermore,the addition of Co induces a larger transformation driving force and a lower bainite start temperature(Bs),thereby contributing to the refinement of blocks and the increase of the V1/V2 variant pair.These findings would be instructive for the composition,microstructure design,and property optimization of high-strength steels.
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