Influence of Ti/TiN Coatings on Failure Modes of Cr12MoV Roll for Auto Sheet
Cold working roll is one of the most important factors for the Auto sheet and parts quality during processing.In this paper,the failure mechanism of Cr12MoV cold working roll is studied and compared respectively with that before and after Ti/TiN coating by using SEM,EDS and etc.The results show that main failure mode of roll is surface fatigue wear before PVD Ti/TiN coating which fatigue cracks initiate at the site of surface or sub-surface defects.But for the cold working roll after PVD Ti/TiN coating failure mode transfers into fatigue fracture.Such kinds of fatigue cracks always initiate at sub-surface defects and the morphology of carbide in sub-surface layer plays an important role for fatigue cracks initiation.The morphology of carbide in sub-surface layer can be changed due to PVD Ti/TiN coating during rolling which is beneficial to improve the service life of cold working roll.
Ti/TiN coating Failure mode Cold working roll
Jia Gengwei Lin Zhangguo Gu Fenglong
Hebei Iron&Steel Group,Hansteel Technology Center,Hebei,056000,China
国际会议
The 2nd International Symposium on Automobile Steel (第二届汽车用钢生产及应用技术国际研讨会)
鞍山
英文
289-293
2013-05-21（万方平台首次上网日期，不代表论文的发表时间）