Solidor N. Increase abrasive and impact-abrasive wear resistance of economical manganese steels due to the perfection of heat treatment conditions

The object is the conformities to the law of forming of microstructure, transformations of phases, wearproofness and mechanical properties of new Fe-Mn steels under various conditions wears. The purpose is development of the modes of heat treatment economy alloyed the manganese of steels for the increase of complex of mechanical and official properties of details, workings under various conditions wears. Methods - experimental with the use of standard methods (metallographic, electronic-microscopic, static tests on tension, dynamic tests). Tests on a wear under various conditions conducted on the specially created laboratory options and in the terms of productions; methods of mathematical statistics with the use of programmatic packages of Microsoft Excel, Data Fit 8.2 and MathCAD. Novelty - grounded and efficiency of application of the differentiated approach (taking into account Kd) is experimentally confirmed to the choice of composition and technology of treatment new economy alloyed the manganeseof steels, principle of purposeful management an amount is fixed in basis of which, by the degree of stability of austenite and development of transformations of structurally-phases of deformations in the process of exploitation. Results - it is set that for the increase of longevity of details, workings in the conditions of abrasive wear resistance and dry friction, it is necessary to apply became from 5-7 % Mn and tempering to conduct them from in relation to low temperatures - 850-950 °С. For steels with more high maintenance of manganese (~10 %) with the same purpose destabilization of austenite is recommended due to decarbonating of surface at heating under tempering, conducting after tempering of senescence or slow (as compared to water) cooling of details from the temperature of austenitization. In the conditions of impact-abrasive wear resistance it is necessary to apply became, containing 9-11 % Mn, to carry out tempering from the promoted temperatures not below 1050 °С, and in a number of cases additionally to promote stability of austenite a low temperature senescence, eliminating the selection of carbides; it is necessary to take decarbonating of surface to the minimum. For the increase of impact-abrasive wear resistance of steels with the lowered maintenance of manganese conducting of cementation is recommended. Degree of introduction - in dissertation the recommendations are given at the choice of rational modes of processing widely used in an industry steels for increase them wear resistance depending of chemical composition, phase structures and conditions of wearing, characterized in factor of dynamics. The results of dissertations have passed industrial inculcation and approbation and to receive expected economic benefit 40769 and 202566 grn. Sphere of the use - metallurgical, machine-building enterprises of Ukraine