Fig. 1. Microstructures of 22MnB5 base metal and Al‒Si coating. (a)‒(c) In as-received condition; (d)‒(f) after hot-stamping

Fig. 2. Microstructures of the weld before hot-stamping

Fig. 3. Microstructures of the weld after hot-stamping

Fig. 4. EBSD analysis of 3# weld after hot-stamping. (a) Image quality map; (b) inverse pole figure; (c) grain boundary map; (d) KAM image

Fig. 5. Map-scanning patterns of different elements in 3# weld center after hot-stamping

Fig. 6. Phase transformation at different Ni contents simulated by JMatPro software. (a)‒(b) Mass fraction of Ni is 0.85%; (c)‒(d) mass fraction of Ni is 3.8%; (e)‒(f) mass fraction of Ni is 6.5%

Fig. 7. Microhardness distributions of 3# joint welded by Ni-based alloy filler wire laser welding and the de-coated joint without filler wire after hot-stamping

Fig. 8. Tensile test results of 1#, 2#, 3# joints welded by Ni-based alloy filler wire laser welding after hot-stamping. (a) Tensile properties; (b) fracture location

Fig. 9. SEM morphology of tensile fracture of 1# joint welded by Ni-based alloy filler wire laser welding after hot-stamping

Fig. 10. SEM morphology of tensile fracture of 3# joint welded by Ni-based alloy filler wire laser welding after hot-stamping