Nitride-boride hardening of martensitic steel
Separate use of nitrogen and boron for alloying corrosion-resistant steels has been analyzed. A complex joint application of nitrogen and boron compounds for hardening of chromium steel with a martensite matrix is proposed. A new composition of a high-chromium flux-cored wire with a complex of boride compounds (BN, TiB2, ZrB2) is developed, which ensures the production of welded metal of composite type. The results of studies of the structure, properties, and phase composition of such a metal are presented. It has been established that the formation in such a metal of a martensitic matrix with a reduced average size of the structure fragments resulting from the separation of dispersed nitride-boride phases determines the high hardness and wear resistance of coatings deposited with a new flux-cored wire.