Abstract
An innovative design procedure based on phase transformation theory alone has been successfully applied to design steels with a microstructure consisting of a mixture of bainitic ferrite, retained austenite, and some martensite. An increase in the amount of bainitic ferrite is needed in order to avoid the presence of large regions of untransformed austenite, which under stress decompose to brittle martensite. The design procedure addresses this diffi culty by adjusting the T′o curve to greater carbon concentrations with the use of substitutional solutes such as manganese and chromium. The concepts of bainite transformation theory can be exploited even further to design steels with strength in excess of 2.5 GPa and considerable toughness.
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Caballero, F.G., Miller, M.K., Garcia-Mateo, C. et al. Phase transformation theory: A powerful tool for the design of advanced steels. JOM 60, 16–21 (2008). https://doi.org/10.1007/s11837-008-0159-z
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DOI: https://doi.org/10.1007/s11837-008-0159-z