Fig. 1. Particle size of powder and schematic of LAM. (a) Particle size of powder; (b) schematic of LAM

Fig. 2. Thermal cycle curve of single-pass cladding reheating process

Fig. 3. Schematic of sample size for thermal cycle simulation test

Fig. 4. Metallographic structures of original cladding layer. (a) Cladding layer; (b) columnar crystal; (c) SEM image; (d) schematic of multi-layer partition

Fig. 5. Thermal cycle curves under different conditions. (a) Different peak temperatures; (b) different cooling rates

Fig. 6. Metallographic structures under different thermal cycle peak temperatures. (a)(e)(i) 860 ℃；(b)(f)(j) 910 ℃；(c)(g)(k) 960 ℃；(d)(h)(l) 1100 ℃

Fig. 7. Metallographic structures under different cooling rates at 960 ℃. (a)(e)(i) 3 ℃/s; (b)(f)(j) 12 ℃/s; (c)(g)(k) 21 ℃/s; (d)(h)(l) 30 ℃/s

Fig. 8. Average aspect ratios of α_p under different conditions. (a) Different peak temperatures; (b) different cooling rates

Fig. 9. XRD patterns of samples under different thermal cycle conditions. (a) Different peak temperatures; (b) different cooling rates

Fig. 10. Hardness distributions. (a) Hardnesses of different tissues; (b) mean distribution of hardness

Fig. 11. Micro-shear curves under different thermal cycle conditions. (a) Different peak temperatures; (b) different cooling rates

Fig. 12. Micro-shear fractures under different peak temperatures. (a) 860 ℃；(b) 910 ℃；(c) 960 ℃；(d) 1100 ℃

Fig. 13. Micro-shear fractures under different cooling rates. (a) 3 ℃/s; (b) 12 ℃/s; (c) 21 ℃/s; (d) 30 ℃/s