Fig. 1. Microstructures of induction-quenched 42CrMo. (a) SEM image of induction-quenched 42CrMo; (b) partial enlargement of Fig.1(a)

Fig. 2. Flow chart of laser cladding of wind power bearing raceway simulator. (a) Preheat; (b) laser cladding; (c) slow cooling; (d) dye penetration inspection@@@

Fig. 3. XRD pattern of martensitic stainless steel coating

Fig. 4. Macroscopic morphology and microstructures of martensitic stainless steel coating. (a) Macroscopic morphology of coating; (b) microstructure of interface between coating and substrate; (c) microstructure of coating; (d) partial enlargement of Fig. 4(c); (e) bright-field TEM image and corresponding SADP pattern of substrate; (f) partial enlargement of Fig. 4(e) and corresponding SADP pattern; (g) dark-field TEM image of austenite; (h) dark-field TEM image of M₂B; (i) bright-field TEM image and corresponding SADP pattern of M₂B; (j) bright-field TEM image and corresponding SADP pattern of M₂₃C₆

Fig. 5. Solidification process of martensitic stainless steel coating. (a) Relative elongation-temperature curve of coating; (b) DSC curve of coating; (c) diagram of coating solidification process

Fig. 6. Residual stress on martensitic stainless steel coating

Fig. 7. Coefficient of thermal expansion of martensitic stainless steel coating

Fig. 8. Hardness distributions in martensitic stainless steel coating and induction-quenched 42CrMo. (a)Cross-section hardness distributions in coating and induction-quenched 42CrMo; (b) nanoindentation of coating

Fig. 9. Friction and wear properties of martensitic stainless steel coating and induction-quenched 42CrMo. (a) Friction coefficient-time curve; (b) average wear loss and friction coefficient

Fig. 10. Surface worn morphologies of martensitic stainless steel coating and induction-quenched 42CrMo. (a) Worn surface of induction-quenched 42CrMo; (b) partial enlargement of Fig. 10(a); (c) worn surface of coating; (d) partial enlargement of Fig. 10(c)

Fig. 11. Corrosion resistance properties of martensitic stainless steel coating and induction-quenched 42CrMo. (a) Cumulative weight loss curves; (b) polarization curves