The effect of carbon on the secondary hardening process of the Fe–C–Ni–Cr–Mo–Si–Ti–Al steel system obtained by surfacing with a powder wire is studied

Powder wires based on high-strength steels with the effect of secondary hardening are widely used for surfacing wear-resistant coatings. The aim of the work was to study the features of carbide-intermetallic hardening by aging of low-alloy steel Ni7Cr6Mo2Si2TiAl with different carbon concentrations obtained by surfacing with powder wire. It has been established that such steel has the best durometric properties as a result of aging at a temperature of 550 ° C for 2 hours at a carbon concentration of 0.25 %. In this case, the microhardness of the matrix reaches 681 HV, the hardening phases — 1098 HV, and the hardness of the steel reaches 53 HRC. It is shown that the structure of steel after aging consists of martensite and 15 types of compounds of phase components. It was found that the hardening of steel is caused by the formation of complexes of eleven intermetallides NiAl, Cr0.92Mo3.08, Fe0.875Mo0.125, Fe0.68Si0.25Cr0.1, D2Ti, Mo0.984Ni0.016, Ti3Al, Ni3Ti, FeCr, AlFe, NiTi2, and four carbides TiD0.707C0.5, Cr3C2, TiC, SiC. Sufficiently high hardness values of such steel after aging make it possible to recommend powder wire based on it for wear-resistant coating.
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