Stability of structure and functional properties ferritic-martensitic steel after combined processing

Abstract

The ferritic-martensitic steel of the EI-961SH, subjected to complex processing, includingstandard heat treatment, cold rolling to a degree of 50% and re-quenching from a temperatureof 850 ºC, was studied. Rolling leads to the formation of a band structure, particles are located alongthe boundaries of the bands. As a result of the re-quenching of the rolled state, the structure of the batchmartensite was formed. At the same time, the reinforcing carbide particles of Cr23C6 were preservedin the structure, and the volume of globular carbides also increased. This state of crushed grains withcarbide particles provided high mechanical properties. The thermal stability of the obtained stateat the operating temperature is investigated.