Abstract
When in operation, the parts of mechanisms and units tend to wear out, which determines the useful life of the overall mechanism or unit. The wear rate depends on a number of factors such as the chemical composition of the alloy, microstructure, mechanical properties, as well as on the factors contributing to wear, such as sliding, impact stress, exposure to heat etc. These factors will define the wear mechanisms characteristic of the parts made from different wear resistant alloys including high manganese steel. A closer look at the wear mechanisms will make it possible to, first, understand the role of the alloy microstructure and, secondly, to get an insight into the wear mechanisms typical of high manganese steel under various conditions and to define the role of some alloying elements in these mechanisms. Objectives: The objectives include to carry out metallographic tests to understand the mechanisms of abrasive and impact and abrasive wear in high manganese steel and to analyse the structural transformations taking place in the wear zone. Methods Applied: To tackle the task at hand, a number of laboratory experiments were carried out in which high manganese steel specimens were subject to various wear conditions. The resultant wear surfaces were studied using metallographic equipment. Findings: Structural change patterns have been identified for high manganese steel under abrasive and impact and abrasive wear conditions; quantitative structural parameters of the alloy have been identified which occur under various wear conditions; the role of the secondary phase in the high manganese steel wear mechanism has been studied under various wear scenarios. The data obtained can give a deeper insight into the processes developing in high manganese steel parts under abrasive and impact and abrasive wear conditions. The data can also be used to determine the adequate chemical composition that can enhance the wear resistance of the steel.
Keywords
High manganese steel, austenite, secondary phase, hardened layer, martensite, deformation twins.
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