Self-formation of protective oxide films at dry sliding mild steel surfaces under a medium vacuum

摘要: The friction and wear at dry sliding steel surfaces under different vacuum conditions have been investigated to understand the mechanisms of mild in vacuum. For test, a ball-on-disk type wear-rig has built implemented, allowing control speed, load A theoretical analysis frictional heating an experimental influence oxidation are described. Results show that, low velocity, medium vacuum, effective, protective oxide films can be formed on surface process with self-regulating way, which results both very coefficient (about 0.3) wear. It is found that significant reduction caused by formation thin layer Fe3O4 oxides promoted high temperature plastic deformation local area, they compaction debris while supporting bearing preventing direct intermetallic contact surface. Oxide velocity ineffective protect against severe suggest there critical regime for producing steel.