Fig. 1. Cross-sectional morphology of laser-quenched 40CrNiMoA steel. (a) Photograph of low-power stereo microscope; (b) photograph of high-power stereo microscope

Fig. 2. Microstructures of substrate surface and phase-transformation hardening zone after laser-quenching. (a) Substrate; (b) phase-transformation hardening zone

Fig. 3. Microhardness distribution of cross section of laser quenched specimen

Fig. 4. Friction coefficient as a function of time

Fig. 5. Morphologies of surface after wear. (a) Substrate; (b) laser-quenched sample

Fig. 6. Electrochemical corrosion curves of different samples