Effect of different atmospheres on dry friction behavior of steel sliding against brass at high speed  

作　　者：QIU Ming ZHANG YongZhen 

机构地区：[1]School of Mechatronic Engineering, Henan University of Science & Technology, Luoyang 471003, China [2]School of Material Science and Engineering, Henan University of Science & Technology, Luoyang 471003, China

出　　处：《Chinese Science Bulletin》2009年第24期4589-4593,共5页

基　　金：Supported by the National Basic Research Program of China (Grant No. 2007CB607603);National Natural Science Foundation of China (Grant No. 50775066)

摘　　要：The atmosphere components have an influence on tribological behaviors of tribo-pairs. Through changing the atmosphere component, the effect of atmosphere component on the tribological behaviors of CrNiMo steel against brass at high sliding velocity was investigated. The wear test was carried out on a high-speed friction and wear test rig whose test atmosphere could be controlled. The tests were performed at four sliding velocities (30, 40, 50, 60 m/s), one contact pressure (1.33 MPa) and two atmosphere components (N2 or O2). The morphologies of the worn surfaces of various pins were observed with a scanning electron microscope. The chemical compositions of the surfaces and subsurfaces for steels were determined with an energy dispersion spectroscopy. The results showed that the wear rate of the steel pins were low all the time with the sliding velocity increasing in oxygen atmosphere, and that the wear rate of the steel pin in nitrogen atmosphere was higher than that of the steel pin in oxygen atmosphere. It was found that the thin and compact oxidation layer formed on the worn surface of the steel in oxygen atmosphere played a key role in wear resistance. However, the wear rate of the steel pin increased rapidly with the sliding velocity increasing in nitrogen atmosphere, which was attributed to the thick and loose surface layer formed on the worn surface of the steel.The atmosphere components have an influence on tribological behaviors of tribo-pairs. Through changing the atmosphere component, the effect of atmosphere component on the tribological behaviors of CrNiMo steel against brass at high sliding velocity was investigated. The wear test was carried out on a high-speed friction and wear test rig whose test atmosphere could be controlled. The tests were performed at four sliding velocities （30, 40, 50, 60 m/s）, one contact pressure （1.33 MPa） and two atmosphere components （N2 or O2）. The morphologies of the worn surfaces of various pins were observed with a scanning electron microscope. The chemical compositions of the surfaces and subsurfaces for steels were determined with an energy dispersion spectroscopy. The results showed that the wear rate of the steel pins were low all the time with the sliding velocity increasing in oxygen atmosphere, and that the wear rate of the steel pin in nitrogen atmosphere was higher than that of the steel pin in oxygen atmosphere. It was found that the thin and compact oxidation layer formed on the worn surface of the steel in oxygen atmosphere played a key role in wear resistance. However, the wear rate of the steel pin increased rapidly with the sliding velocity increasing in nitrogen atmosphere, which was attributed to the thick and loose surface layer formed on the worn surface of the steel.

关 键 词：CrNiMo钢 摩擦学行为 氧气气氛 摩擦滑动 黄铜 大气成分 电子显微镜观察 摩擦磨损 

分 类 号：TG142.41[一般工业技术—材料科学与工程] TH117.1[金属学及工艺—金属材料]