Fig. 1. XRD patterns of laser cladded Ni-based-alloy coatings

Fig. 2. Microhardness distribution in cross section of Ni-based-alloy coating

Fig. 3. Macro-morphologies of cracks in laser cladded Ni-based-alloy coatings. (a) 2.8 kW; (b) 3.2 kW; (c) 3.6 kW; (d) 4.0 kW

Fig. 4. Microstructure of cross-section of Ni-based-alloy coating and crack micro-morphology. (a) Overall morpholog; (b) morphology and microstructure of cross-section; (c) coarse crack; (d) microcrack

Fig. 5. Fracture morphology of crack in laser cladded Ni-based-alloy coating. (a) Overall fracture morphology; (b) river pattern of fracture surface; (c)(d)tearing ridge of fracture surface

Fig. 6. SEM morphology of crack and element distribution in laser cladded Ni-based-alloy coating. (a) SEM morphology; (b) Ni; (c) Cr; (d) Fe; (e) B; (f) C

Fig. 7. Effects of laser cladding process factors on cracking sensitivity (The rulers represent 10 mm). (a) Laser power (V=10 mm/s, Q=25.9 g/min, and T=100 ℃); (b) powder feeding rate (P=2.8 kW, V=10 mm/s, and T=100 ℃); (c) scanning speed (P=4.0 kW, Q=25.9 g/min, and T=100 ℃); (d) preheating temperature (P=2.8 kW, Q=22.7 g/min, and V=10 mm/s)

Table 1. Chemical compositions of alloy powder and base material (mass fraction, %)

Table 2. Compositional analysis by EDS (mass fraction, %)