The current state and the prospects for the development of high-plasticity ultrastrong Fe-Mn-Al-C steels

Abstract

The article considers the physicochemical properties and prospects of using austenitic steels with high manganese content. Detailed analysis of publications gives an idea of the current state of development of alloys based on Fe-Mn-Al-C, reveals insufficiently studied problems and identifies promising areas for further research. The influence of alloying elements on the strengthening mechanisms of high-manganese austenitic Fe-Mn-Al-C steels is shown, and the principle of choosing the optimal ratio between the main components of Mn, C and Al alloy to ensure low density and high strength and ductility is considered. The influence of rare earth elements such as Ce, La and Y on the formation of the microstructure of such steels is considered. The general characteristic of their mechanical properties steels is given, and also the detailed review of influence of Al, Mn, Cr on their is given. Particular attention is paid to the mechanism of к-carbides release in alloys during their heat treatment. Promising directions of research of Fe-Mn-Al-C steels from the point of view of mechanisms of their strengthening due to formation of к-carbides at cooling and heat treatment are offered. It is shown how the cooling rate affects the phase composition, microstructure and mechanical properties of these steels. It is noted that water cooling can prevent the excessive formation of к-carbides under certain conditions (such as geometric dimensions and Al content). It is determined that the development of composition, smelting technologies, out-of-furnace and subsequent thermomechanical processing of high-strength Fe-Mn-Al-C steels is a timely comprehensive study aimed at increasing the competitiveness of the Ukrainian metallurgical industry by developing the range of steel products, reducing the amount of harmful emissions of combustion products, saving minerals by reducing fuel consumption.