Application of thermochemical treatment for creation of metastable modifications realizing the effect of self-strengthening at steel wear

It was proposed to solve urgent problems of saving scarce and costly high-alloyed and wear resistant steel grades (containing Ni, Mo, V, W, Nb) and increasing wear resistance of metal parts by means of creating surface modifications of metastable phase-structural complexes in inexpensive economical alloys of the similar structural classes. The objective of this work is to investigate the influence of alloying elements upon the formation of the structure, metastability of austenite and properties of chromium-manganese steel grades, undergoing carburizing and manganese steel undergoing decarburizing. In this work the new ways and processes of surface modifications of metastable phase-structural states were developed: - carburizing Fe-Cr-Mn steels with various contents 2…22 % Cr with subsequent quenching at optimal temperatures of austenitization; - decarburizing austenitization for a specified depth of high-alloyed wear resistant steel grades (110Mn13 ? Hadfield steel, 130Cr12Mo etc.) causing destabilization of austenite and realization deformation induced martensite γ→α′ transformation in the process of wear