Cold eztrusion deformation behavior of medium carbon steel after quenching and tempering
By taking 40Cr as a specific object, cold extrusion deformation behavior of medium carbon steel after quenching and tempering was studied by experimental works. The influence of deformation extent (10%-50%), cone angle of die (90°-120°), hardness after quenching and tempering (HRC21-29) and lubricated condition on the forming load was analyzed. The results show that there is no central bursting and micro crack in the inner of the extruded specimen, and the forming quality is good. The double-peak phenomenon takes place at the front-end of the specimen; the double-peak index increases with deformation extent, and larger deformation can avoid the doublepeak phenomenon. The deformation extent is the most important influencing factor, and the lubricated condition almost has no influence, which means that the phosphate coating plus soap process is still a proper lubrication method for cold extrusion of medium carbon steel after quenching and tempering. By investigating the microscopic structure before and after deformation, the initial equiaxed grain is elongated in the extrusion direction, and this feature is more significant at the front-end of specimen.
medium carbon steel quenching and tempering cold eztrusion deformation behavior microstructure
HU Cheng-liang ZHAO Zhen YIN Guan-ren YUAN Zhao-feng XU Xiang-long
Department of Plasticity Technology, Shanghai Jiao Tong University, Shanghai 200030, China Jiangsu Sunway Precision Forging Co., Ltd., Dafeng 224100, China
国际会议
2009 Frontier Symposium of China Postductors on Materrials Science(2009年中国博士后材料科学前言论坛)
长沙
英文
552-557
2009-11-22（万方平台首次上网日期，不代表论文的发表时间）