Fig. 1. Micromorphologies of 316L stainless steel and IN625 alloy powders. (a) 316L; (b) IN625

Fig. 2. Designs of gradient material and tensile specimens of 316L-IN625. (a) Gradient sample prepared by laser deposition; (b) coaxial laser processing head; (c) tensile specimen of gradient material

Fig. 3. OM and SEM images of different regions of 316L-IN625 gradient material. (a)(c) 316L and 70% 316L regions; (d)(e) 40% 316L region; (f)(g) 30% 316L region; (h)(i) IN625 region

Fig. 4. XRD spectra and crystal plane full width at half maximum (FWHM) of different regions of 316L-IN625 gradient material. (a) XRD spectra; (b) FWHM of (200) plane

Fig. 5. Tensile properties of joint and gradient samples of 316L-IN625. (a) Stress-strain curves; (b) yield strength (σ_0.2)

Fig. 6. Fracture morphologies of joint and gradient samples of 316L-IN625. (a)(c) Joint sample; (b)(d) gradient sample

Fig. 7. Microhardness distribution of joint and gradient samples of 316L-IN625