1. Engineering Research Center of Advanced Mining Equipment, Ministry of Education, Hunan University of Science and Technology, Xiangtan, 411201, China 2. Soil and Fertilizer Institute, Hunan Academy of Agricultural Science, Changsha, China 3. College of Materials Science and Engineering, Hunan University, Changsha, 410082, China
刊物类别:Chemistry and Materials Science
刊物主题:Chemistry Tribology, Corrosion and Coatings Surfaces and Interfaces and Thin Films Theoretical and Applied Mechanics Physical Chemistry Nanotechnology
出版者:Springer Netherlands
ISSN:1573-2711
文摘
The friction and wear behavior of surface nanocrystalline martensite steel has been investigated. The wear rate of nanocrystalline martensite ranges from 2 × 10−5 to 4.5 × 10−5 mm3/m at an applied load of 2–15 N. It is one order of magnitude lower than its ultrafine grain counterpart. The surface hardness of both nanocrystalline and ultrafine martensite steels is about 7.0 GPa. It is unexpected according to Archard’s equation that the wear rate has an inversely linear relationship to hardness. The investigations indicate that the diffusion rate of Cr towards a worn surface dramatically increases as the average grain size of martensite steel decreases to 30 nm. This leads to the formation of Fe2O3, CrO3 and FeCr2O4 films on the worn surface and an improvement in the wear resistance of martensite steel.