MICROSTRUCTURES DOMINATING THE DUCTILITY OF EUTECTOID PEARLITIC STEELS.

Abstract

Microstructures which control the ductility of eutectoid pearlite steel were experimentally examined. A concept of pearlite block was proposed as an area in which crystallographic orientation of ferrite is constant. It was revealed that the pearlite block acts as a unit of slip and fracture of pearlite steels. The refinement of austenite grains, which is effective when improving the ductility of pearlite steels, was found to be due to the resulting refinement of pearlite blocks. 17 refs.