Fe-Ni-based amorphous coatings fabricated by laser and annealing performance

FeNi-based amorphous coating was prepared by laser cladding on the mild steel with a 15 kW continuous CO₂ laser.The phases,microstructure and the effect of addition elements on forming ability of the amorphous coatings were studied by using X-ray diffractometer and scan electron microscope.The results show that the addition form of the ferroniobium is better than that of the pure niobium powder during the synthesis of the amorphous coating.The addition of ferroniobium can restrain the generation of the crystalline grains such as Ni₂Si and Ni₂B.The microhardness of the coating increases after annealing at 500℃,declines at 600℃,increases at 700℃ and 800℃ and declines at 900℃.