齿轮材料40Cr表面强流脉冲电子束改性的分析  

Analysis of 40Cr Surface Modification by High Current Pulsed Electron Beam

作　　者：李晖[1] 刘威[1] 孙迎军[1] 陈亚茹[1] 

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054

出　　处：《热加工工艺》2015年第22期128-131,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51275548);重庆自然科学基金资助项目(cstc2012jj B70002)

摘　　要：采用强流脉冲电子束对齿轮常用材料40Cr进行辐照,通过表面的形貌特征、表层组织以及显微硬度变化,研究该技术用于齿轮材料表面强化的效果。结果表明,在相同的24kV电压下,脉冲次数的增加能降低熔坑数量,改善材料表面的平整性、完整性;电子束照射在表面形成具有一定厚度的高硬度熔凝层,熔凝层厚度增加,能够提高材料的表面硬度;40Cr经25次照射处理,其表面能够获得6μm厚的熔凝层,达到65次照射下熔凝层厚度的3倍,其表面硬度最高达到547 HV0.05,为基体表面硬度296 HV0.05的1.85倍,强流脉冲电子束表面处理后对齿轮材料40Cr具有一定的强化效果。Influences of high current pulsed electron beam （HCPEB） on surface modification of gear material 40Cr were studied by analyzing of surface morphology, microstructure and surface hardness. The results show that quantity of craters decreases with the increase of pulse irradiation times of HCPEB, which improves the surface smoothness and integrity. Melted layer is formed on the surface with a certain thickness and higher hardness with electron beam irradiated. The increase of melted layer thickness can improve material surface hardness. Melted layer with 6μm thickness is obtained by electron beam irradiating in 25 pulses, which is 3 times of same process in 65 pulses, and the surface hardness reaches 547 HV0.05 and is 1.85 times of substrate with hardness 296 HV0.05. Irradiation of HCPEB on 40Cr has a significant effect on surface strengthening.

关 键 词：强流脉冲电子束 40Cr 表面硬度 组织 

分 类 号：TG156.99[金属学及工艺—热处理]