抄録
For 0.42%C and 0.87%C carbon steels wear experiments were carried out with a pin-on-ring type wear testing apparatus in white spindle oil. Metallurgical structures, oxidation, hardening and residual stresses were examined by optical and electron microscopy and X-ray and EPMA techniques in the surface layers during the steady wear process, and the relation between wear rates and those properties was discussed.
The results obtained are as follows:
(1) The wear situation can be divided into two forms; one is always mild wear from the starting of sliding, and the other changes from severe to mild wear. The severe wear is due to the seizing.
(2) In the case of the change from severe to mild wear, continuous hard layers occur on all the frictional surfaces.
(3) Fine cracks and pits brought about by fatigue are observed in the continuous hard layers.
(4) In white spindle oil the specific wear of both carbon steels decreases by a factor of 102∼104 and this change with the sliding speed is gradual as compared with that in air.
