Metallographic techniques for the determination of the austenite grain size in medium-carbon microalloyed steels

摘要

The determination of the austenite grain size in medium-carbon microalloyed steel was investigated by metallographic techniques. Procedure based on the combination of heat treatment and chemical etching revealed the austenite grain boundaries for some steels in austentization conditions. The results showed that the thermal etching was the most adequated method for revealing the PAGS of the investigated microalloyed steel.