引用本文:胡建军, 许洪斌, 陈元芳, 韩超.电子束改性40Cr材料表面微动摩擦磨损性能分析*[J].中国表面工程,2012,25(4):107~111
.Analysis of Friction and Wear Properties of 40Cr by High Current Pulsed Electron Beam[J].China Surface Engineering,2012,25(4):107~111
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电子束改性40Cr材料表面微动摩擦磨损性能分析*
胡建军a, 许洪斌b, 陈元芳a, 韩超a
（重庆理工大学 a. 材料科学与工程学院 b. 汽车零部件制造及检测技术教育部重点实验室, 重庆 400054）
摘要:
利用强流脉冲电子束技术对齿轮常用材料40Cr进行表面改性，利用光学显微镜、X射线衍射仪、粗糙度仪、显微硬度仪和摩擦摩损仪对比分析40Cr材料表面电子束改性前后的材料表面形貌、组织和力学性能及其对摩擦磨损性能的影响。结果表明：40Cr材料经电子束处理后，表面粗糙度增加，截面硬度在表层1 mm内增加，材料表层组织结构由于重熔快冷发生变化而产生残余奥氏体，硬度和组织的变化都起到改善材料微摩擦磨损性能的作用。电子束改性样品摩擦因数在实验初期相对稳定，随着摩擦磨损试验的进行，摩擦因数急剧升高并接近于电子束改性前的样品。微动摩擦性能得到提高，磨损量相当于改性前的26.4%，降低近4倍。
关键词:  电子束  40Cr  表面改性  摩擦性能  耐磨性
DOI：
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Analysis of Friction and Wear Properties of 40Cr by High Current Pulsed Electron Beam
HU Jianjuna, XU Hongbinb, CHEN Yuanfanga, HAN Chao
(a. College of Material Science and Engineering b. Key Laboratory of Manufacture and Test Techniques for Automobile Parts, Ministry of Education, Chongqing University of Technology, Chongqing 400054)
Abstract:
The sample of 40Cr steel, common material used in gear manufacturing, was modified on surface with high current pulsed electron beam. Then the surface roughness, structure and property were tested and the effect to friction and wear property were analyzed and contrasted. Experimental results show that surface roughness increases after high current pulsed electron beam, while the surface section hardness increases 1 mm in depth from surface. The material surface structure changes and new retained austenite generates because of fast melting and cooling. The increase of microhardness and change of the structure positively influence the friction and wear property of 40Cr. The friction coefficient of modified samples is lesser and stable in the initial wear stage and increases to the approximate same level of original samples during the experiment process. The weight loss after electron beam is about 26.4% as that before electron beam, and this means that the wear extent decreases four times with the electron beam technology.
Key words:  electron beam  40Cr  surface modification  friction property  wear property
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