Abstract
Pin-on-disk type wear tests of mild steel in contact with itself were conducted under unlubricated conditions in moist air to investigate the effect of a change in load on the transition behavior between severe and mild wear. Machines in operation are usually subjected to varying loads. In this study, two contact load levels were used as a simple varying load condition. The load was changed in a step-wise manner between the low and high levels once during certain tests. After oxidized wear surfaces have been formed under mild wear at the low load during the first stage, the wear mode changes to "quasi-mild wear" having a low rate at the high load in the final stage. Oxidation rate of the wear surface under mild wear in the first stage is related to the transition to quasi-mild wear.
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