Synthesis of Functional Surface Layers on Stainless Steels by Laser Alloying

Laser alloying is an effective method to form functional surface layers (coatings) on metallic materials, particularly stainless steels. Unique phase balance, dislocation substructure, and a possibility obtain gradient microstructures after laser slow down the degradation increase wear resistance. In this work, optimal parameters of their effects microstructure properties were investigated for two steels: ferritic AISI 420 austenitic 304. Three types plasters used: 85Nb + 15 graphite, liquid glass, 15Fe 30Ni 20B 10Si 25 glass (wt.%). The power density 0.3 × 105 W/cm2 beam scanning speed 1990 mm/min found generate 220–320 ?m thick coatings with complex microstructures. Phase balance in was studied X-ray diffraction magnetometric analyses. High microhardness (up 16 GPa) resistance associated formation martensite some retained austenite Nb-, Cr-, Si-, B-rich particles layer steel, high strengthened Ti-, Si-rich 304 steel.