激光-电磁场复合强化对45钢硬度的影响  

Influence of laser-electromagnetic field composite strengthening on hardness of 45 steel

作　　者：沈俊波 黄丽燕[1] 刘建永[1] 郭维昭[1] 曾维林[1] SHEN Jun-bo;HUANG Li-yan;LIU Jian-yong;GUO Wei-zhao;ZENG Wei-lin(Department of Mechanical Engineering, Jiangxi Vocational College of Industry and Engineering, Pingxiang 33700, Jiangxi, Chin)

机构地区：[1]江西工业工程职业技术学院机械工程学院

出　　处：《钢铁研究学报》2018年第6期498-503,共6页Journal of Iron and Steel Research

摘　　要：研究了旋转磁场对45钢表面硬度的影响规律。利用自制的磁能强化装置对经过激光相变硬化的45钢进行磁化处理。研究了不同的磁场频率、磁化时间对45钢硬度的影响规律。通过金相显微镜观察45钢的金相组织,分析其性能得到提升的微观机理。试验结果表明：在合适的磁化工艺参数条件下,45钢的表面硬度均得到不同程度的提高。旋转磁场能降低马氏体激活能,促使部分残余奥氏体转换为马氏体,位错重新分布并趋于均匀化,材料的显微组织变得致密。The influence of rotating magnetic field on hardness of 45 steel was studied.The 45 steel which was under the process of laser transformation hardening was magnetized by self-made magnetic enforcement device.The effect of magnetic frequency,magnetic time on hardness of 45 steel was studied.The microstructure of 45 steel laser transformation hardening layer was analyzed by metallographic microscope,and its microscope mechanism of properties′improvement was considered.Experiment results show that surface hardness values of 45 steel samples are all improved under proper magnetic processing parameters.A part of retained austenite is transformed into martensite because of decrease of martensite activation energy when rotating magnetic field is applied.Dislocation redistributes and becomes more uniform.Microstructure of the sample is more compact.

关 键 词：45钢 激光相变硬化 电磁场 显微组织 硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]