摘要
汽车主动齿轮用钢20CrMnTi在毛坯锻造后如存在带状组织时,将严重影响零件的可靠性和安全性.探讨和实验了将20CrMnTi钢试样加热到奥氏体状态,在保温过程中,用自行设计、制造的脉冲电流发生器,输入频率为50Hz,强度为1 000 A的脉冲电流,再将试样出炉空冷.由于奥氏体化加热和脉冲电流的复合处理,试样可以在短时间内迅速消除带状组织,细化晶粒,为后续的热处理———渗碳、淬火提供了良好的基体组织,提高了20CrMnTi钢制造的汽车主动齿轮可靠性和安全性.
The reliability and safety of the driving gear of automobile may be influenced seriously by the band structure in the 20 CrMnTi blank, which is induced by forging. The article has explored and experimented with the specimen which is input a 1 000 A current impulse of 50 Hz by the tailored current - impulse generator during the austenitization, held certain period of time, and then cooled down in the air. The results show that the band structure in such specimen can be eliminated quickly in a short time and the fine grain also be obtained, consequently providing proper matrix structure for the subsequent heat treatments such as carbonizing, quenching. Thus, the reliability and safety of the driving gear have been improved.
出处
《昆明理工大学学报（理工版）》
2006年第5期20-23,43,共5页
Journal of Kunming University of Science and Technology(Natural Science Edition)
基金
云南省自然科学基金资助项目(项目编号:2003E0024M)子项目
关键词
脉冲电流
带状组织
细化晶粒
current Impulse
band structure
grain refinement
