Abstract
Problem Statement (Relevance): Extending the life of cast parts made of high-manganese steel and operating in abrasive and impact wear conditions is an urgent issue that the foundry industry is facing today. At present, there are a lot of alloying materials on offer, which are capable of enhancing the mechanical and performance characteristics of alloys. The industrial application of such materials is limited due to the lack of evidence about the effect the materials on offer produce on the performance characteristics and other properties of the final products. Objectives: The aim of this research is to study the effect of nitrided ferrochromium on the wear resistance of high-manganese steel, as well as to study the microstructure of the wear surface at different chromium concentrations. Methods Applied: To achieve the above objectives a number of laboratory experiments and metallographic tests were carried out, and the mechanical and performance characteristics of the pilot alloys were examined using the methods specified in the national standards. Findings: The paper describes the results of a full-scale investigation of high-manganese steel alloyed with nitrided ferrochromium. The authors demonstrate how the chromium concentration and the alloy cooling rate effect the cast structure formation in and the mechanical and performance characteristics of high-manganese steel. The optimum chromium concentration was determined, which provides the maximum wear resistance index in the as-cast state and after heat treatment. The authors analyse how nitrided ferrochromium and the alloy cooling rate effect the anisotropy factor of the austenite grain. The article looks at a number of cases of the austenitic matrix wear caused by chromium carbides, as well as the effect of chromium on the austenitic matrix microhardness. Practical Relevance: The results obtained may be useful when selecting the chemical composition of high-manganese steel for improved performance.
Keywords
High-manganese steel, nitrided ferrochromium, cooling rate, wear resistance index, microstructure, microhardness.
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