Effect of the Grain Size and Deformation Substructure of Austenite on the Crystal Geometry of Bainite and Martensite in Low-Carbon Steels

Abstract

The effect of deformation in the austenitic temperature range on the features of the crystal geometry of the packet-and-block structure of martensite and bainite after cooling is studied for two low-carbon steels with different levels of microalloying. The distribution of lattice off-orientations in the substructure of the austenite formed by hot deformation of a model austenitic steel SS304 is determined. The effect of the grain size of the austenite and of the cooling rate on the bainite and martensite effective grain sizes is investigated. The results are analyzed.