Study on the Crack Forming during Cold Forging Process of ML25Mn Steel
The important factors that affect the formability of the cold forging steel are its surface quality and internal defects.The cracking phenomenon was taken place during cold forging of ML25Mn steel.In this study,microstructural analyses were made on around the cracked regions of the steel.The reason of cracking,which occurred during cold forging for ML25Mn steel,was investigated based on SEM observation in detail.The results have shown that the crack forming during cold forging process is not related to the chemical composition for ML25Mn steel.Cracking is not resulted from high hardness of the steel rods.There are some non-metallic inclusions in the matrix of ML25Mn steel,and the film-like inclusions are composed of MnS,CaS and complex oxides containing Mg,Al,Mn,Fe,S,Ca and O.The formation of non-metallic inclusions is the result of the deoxidation and the solidification during smelting and casting of steel.
Cold forging steel crack forming non-metallic inclusions metallurgical quality
Li Zhuang Wu Di Lv Wei
School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136,Liaoning State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, China School of Graduate, Shenyang Aerospace University, Shenyang 110136, Liaoning, China
国际会议
香港
英文
1255-1258
2012-07-27（万方平台首次上网日期，不代表论文的发表时间）