Characteristics and Effect Factors of Grinding Cracking of GCr15 Steel

The characteristics of grinding cracking and cracks of GCr15 steel were studied by grinding testing, and the effect factors of the grinding cracking were further studied by changing the tempering temperature, performing deep-cooling treatment with liquid nitrogen at -196 ℃ and acid treatment. The results show that the grinding cracks had delayed characteristics and the crack facture was mainly intergranular and owned the characteristics of hydrogen embrittlement fracture. Both acid treatment and deep-cooling treatment promoted the cracking tendency, and the increase of tempering temperature decreased the grinding cracking tendency. The grinding cracking was related to hydrogen-induced cracking.