Fig. 1. Micro-morphology of Fe-Cr-Mo-Si alloy powder

Fig. 2. Laser cladding system

Fig. 3. Test scheme of pin-disc friction-wear

Fig. 4. Morphologies of single cladding layer. (a) Macro-morphology of longitudinal section; (b) micro-morphology of cross-section

Fig. 5. Microstructures in various regions of the cross-section of laser cladding layer. (a) Top region of the cladding layer; (b) middle region of the cladding layer; (c) bottom region of the cladding layer; (d) middle region of the heat affected zone；（e）bottom region of the heat affected zone；（f）Q235 steel substrate

Fig. 6. Micro-hardness measurement on cross-section of the cladding layer. (a) Test points arrangement; (b) micro-hardness distribution curve

Fig. 7. Friction coefficient of specimens

Fig. 8. Wear outline of specimens

Fig. 9. Wear mass loss of different samples

Fig. 10. Wear surfaces of different samples. (a) Cladded sample (1#, F=50 N); (b) cladded sample (2#, F=100 N); (c) cladded sample (3#, F=150 N); (d) substrate sample (4#, F=50 N)

Fig. 11. Schematics of wear mechanism. (a) Abrasive wear; (b) adhesive wear

Table 1. Chemical composition of Fe-Cr-Mo-Si alloy powder and Q235 substrate