INFLUENCE OF ALLOYING AND THERMAL TREATMENT ON ABRASIVE AND IMPACTABRASIVE WEAR RESISTANCE OF CASTINGS PRODUCED FROM HIGH-MANGANESE STEEL

In the introduction, the authors considered the main factors influencing the wear resistance of high-manganese steel and reviewed the domestic and foreign papers devoted to this problem. A conclusion was made on the basis of these materials and the research goal was set which is quite urgent for the enterprises producing and using parts made of Hadfield steel. Further, materials and research methods were considered. There is description of the materials used for processing of liquid steel, the technology of production of experimental samples from high-manganese steel, chemical composition of the alloy used as the basic one, methods and equipment used for calculation of cooling rate of the melt in the casting mold and for the investigation of wear resistance in terms of abrasive and impact-abrasive wear, equipment for hardening and thermal study. The third part of the paper contains the results of investigation of Hadfield steel alloyed with nitride ferroalloys and with complex addition alloy. The graphs show the dependence of abrasive and impact-abrasive wear resistance coefficients on different alloying schemes of the investigated steel with the selected materials. Besides, one can see how the used alloying elements influence the wear resistance of high-manganese steel under different wear conditions. The concentrations of alloying elements have been found, which provide the maximum value of abrasive and impact-abrasive wear resistance coefficient. The results of the thermal study are also given. The processes were investigated, which develop when castings from Hadfield steel are heated for hardening. The research work made it possible to define temperature ranges for such processes as separation of excess phases, dissolution of alloyed cementite in austenite, complete dissolution of phosphide eutectic and carbides of the alloying elements. Temperature ranges of the steel oxidation and decarburization processes were defined. The final part of the paper contains the conclusions of the investigation work and some recommendations aimed at improving the wear resistance of castings made of high-manganese steel for different operating conditions as well as recommendations on the temperatures of thermal treatment for these products.

high-manganese steel, nitride ferroalloys, alloying, austenite, wear resistance, excess phase, hardening

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