Characteristic features of the effect of epitaxial ferrite on the properties of low-alloy ferriticmartensitic steel

Abstract

1. The formation of epitaxial ferrite on cooling from temperatures of the intercritical interval contributes to an increase in plasticity and a reduction in the strength properties of two-phase steels. 2. Together with the volume percentage of epitaxial ferrite, the morphology of its initiation and growth exerts a significant influence on the properties of ferritic-martensitic steels. In this case, the most striking variation in properties is associated with the formation of epitaxial ferrite along the grain boundaries of the initial, old ferrite. 3. With a simultaneous variation in the volume percentages of martensite and epitaxial ferrite, the latter does not significantly affect the ultimate tensile strength; it does, however, contribute to a reduction in the yield point of the steel.