Failure Analysis on Bursting of GCr15 Roll During Heat Treatment

Bursting failure happened to a GCr15 steel roll during the second tempering after quenching, and the bursting process and reason of the roll were studied by means of fracture analysis, chemical compositions analysis hardness test and metallographic examination. The results show that the main reason for the bursting was the poor quality of the material with severe brittleness before heat treatment due to chemical compositions segregation and network carbide, and the internal stress caused by fast quenching cooling speed promoted the bursting. At last improvement measures were proposed to provide reference to the roll production.