Analysis of crack defects in 40CrNiMoA ring forging
The 40CrNiMoA alloy steel billet produced by a certain forging factory was forged into wear-resistant plate ring billet by forging hammer.After quenching and tempering heat treatment,it was found that there were many crack defects on the surface of the ring forgings.In order to investigate the causes of surface crack defects in 40CrNiMoA ring forgings,sam-ples were dissected and analyzed for chemical composition,metallographic examination and scanning electron microscopy.The analysis results indicate that the crack in the 40CrNiMoA ring forging originates from the end face of the ring forging,and the crack propagation mode is a single transgranular propagation.The formation of the crack belongs to the stress crack of heat treatment quenching.
万方数据
维普
