45CrNiMoVA钢脉冲磁处理的强化机理  

Strengthening Mechanism of 45CrNiMoVA Steel by Pulse Magnetic Treatment

作　　者：栾晓圣 梁志强[2] 赵文祥[2] 石贵红 李宏伟[3] 刘心藜 祝国荣[3] 王西彬[2] LUAN Xiaosheng;LIANG Zhiqiang;ZHAO Wenxiang;SHI Guihong;LI Hongwei;LIU Xinli;ZHU Guorong;WANG Xibin(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Key Laboratory of Fundamental Science for Advanced Machining,Beijing Institute of Technology,Beijing 100081,China;Beijing North Vehicle Group Corporation,Beijing 100072,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]北京理工大学先进加工技术国防重点学科实验室,北京100081 [3]北京北方车辆集团有限公司,北京100072

出　　处：《金属学报》2021年第10期1272-1280,共9页Acta Metallurgica Sinica

基　　金：国家重点研发计划项目No.2019YFB1311100;国家自然科学基金项目No.51975053;基础科研项目Nos.DEDPHF、DED‐PZF和DEDPYDJ。

摘　　要：采用脉冲磁场对珠光体态和回火马氏体态45CrNiMoVA钢分别进行了磁化处理,基于纳米压痕实验结果,分析了脉冲磁处理对残余应力、硬度和弹性模量的影响规律;基于磁滞回线的测量和磁力显微镜的观察结果,分析了脉冲磁处理对磁畴微观组织结构的影响。结果表明,脉冲磁处理能够引起试样表面残余压应力增加;脉冲磁处理后珠光体态和回火马氏体态45CrNiMoVA钢硬度分别增加1.85%和1.84%;脉冲磁处理对珠光体态下的弹性模量影响较小,但对回火马氏体态下的弹性模量影响较大,脉冲磁处理后回火马氏体态的弹性模量增加4.48%;磁化过程中,磁畴运动引起微区材料的应力应变是导致材料力学性能强化的主要机制。Understanding the mechanism of the effects of magnetization treatment on the mechanical properties of materials for applications in magnetic field-assisted machining and magnetic treatment strengthening is of great significance.Pearlite and tempered martensite 45CrNiMoVA steels were magnetized by a pulsed magnetic field.Nanoindentation experiments were conducted to examine the effects of a pulsed magnetic field on the residual stress,hardness,and elastic modulus.The effect of pulsed magnetic treatment on the microstructure of the magnetic domain was analyzed by measuring the hysteresis loop and via magnetic microscopy.A magnetic pulse treatment could increase the residual compressive stress on the sample surface.The hardness of pearlite and tempered martensite 45CrNiMoVA steel was increased by 1.85%and 1.84%,respectively,after the magnetic pulse treatment.The magnetic pulse treatment had an insignificant effect on the elastic modulus of pearlite 45CrNiMoVA steel but had a considerable effect on tempered martensite 45CrNiMoVA steel.After the magnetic pulse treatment,the elastic modulus of the tempered martensite 45CrNiMoVA steel increased by 4.48%.In the magnetization process,the stress and strain of the micro-region material caused by the movement of the magnetic domains was the main mechanism responsible for strengthening the mechanical properties of 45CrNiMoVA steel.

关 键 词：45CRNIMOVA钢 脉冲磁场 磁畴运动 强化机理 

分 类 号：TG142.1[一般工业技术—材料科学与工程]