The data on structure, phase composition, tribological behavior, and plastic deformation at friction steel 40X implanted with nitrogen ions under various conditions were presented. The tribological tests were carried out under boundary lubrication at sliding velocity 1 m/sec and under a normal load of 450 N. Industrial mineral oil i-20 was selected as a lubricant. Low-energy ion-beam nitrogen modification of the low-alloyed steel 40X at 620-770 K gave rise to diffusion layers 40-80 μm thick of microhardness 9.5-11.0 GPa. The pre-hardening of steel intensified the diffusion transfer of the modifying impurity to the subsurface layers at implantation temperatures 620-670 K. The maximal wear resistance at adhesion wear of the modified steel 40X was achieved after its treatment at 670-720 K at the stages of the formation of high-nitrogeneous ε-phases. The high ductility of the materials subjected to friction resulted in initiation of turbulent movements of mesostructure elements. The formation of the hardened surface layer of a sufficient thickness hampered the rotation mode of plastic deformation development and thus decreased the wear rate considerably.
|Журнал||Journal of Friction and Wear|
|Состояние||Опубликовано - 2002|
ASJC Scopus subject areas
- Mechanical Engineering