Особливості структуроутворення в економнолегованих хромомарганцевих залізовуглецевих сплавах для гірничо-металургійного обладнання

Abstract

It was established that in cast chromium-manganese alloys of the transition class Fe–C–Mn–Cr system (carbon content no more than 2.2%) with a certain combination of Mn and Cr, the formation of crystals of highly hard carbide Me7C3 is possible. The relationship between the phase-concentration parameters and the structure formation of alloys of the Fe–C–Mn–Cr system was studied, the analysis of the relationship between the phase-concentration parameters, structure formation and properties was carried out on the compositions of the Fe–C–Mn and Fe–C– Mn–Cr with 1.5-2.1% C, with a variable content of Mn, Cr and additives of other alloying elements - Si and Ni at the level of impurities. A phase-concentration diagram of the crystallization of the alloys of this system was constructed, delimiting the regions of crystallization P → γ-Fe, P → γ-Fe + Me3C and P →(γ -Fe + Me7C3) + (γ-Fe + Me3C). It is shown that economically alloyed chromium-manganese alloys of the Fe–Mn–Cr–C system with eutectics based on Me7C3 carbide are characterized by a high level of shock-abrasive wear resistance, and the results of the conducted studies indicate the prospects of using economically alloyed chromium-manganese alloys and can be recommended for further research and use as wear-resistant materials for the manufacture of parts of replaceable metallurgical equipment, which are operated in severe conditions of abrasive and shock-abrasive wear. Keywords: phase-concentration diagram, microstructure, Me7C3 carbide, impact-abrasive wear resistance, chromium-manganese alloys