Abstract
The surface of En31 steel was treated by CO 2 laser for solid state transformation hardening. The wear and friction characteristics of the treated surfaces were examined and compared with untreated surfaces using the lubricated ring-on-block technique. The microstructures of the laser-hardened tracks and the worn surfaces were studied by SEM. The results indicated that the surface of a single hardened track and the surface with two non-overlapping tracks have better wear and friction properties, as compared with the untreated surfaces. Further, surfaces with non-overlapping tracks were found to have better friction properties than the homogeneous hardened zone of a single track.
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