Abstract—
It is shown that the wear resistance of graphitized steel under abrasive action and dry sliding friction can be increased by heat treatment that forms an increased content of metastable residual austenite in the steel structure, which undergoes dynamic strain martensitic transformation (DSMT), the self-quenching effect under loading, (SQL). In order to obtain an optimal content of metastable retained austenite (36%) in the structure of graphitized steel along with tempered martensite and graphite, as well as to achieve the highest relative abrasive wear resistance (εa = 4.8) and wear resistance in dry sliding friction (εdsf = 2.8) than occurs after routine heat treatment (εa = 3.5) and (εdsf = 2), heating to 950°С is required before quenching. Isothermal quenching, including austenitization at 850°C, cooling in water to an isothermal temperature of 300°C, holding for 10 min at this temperature in a furnace, and a subsequent cooling in air led to a slight increase in the relative abrasive wear resistance (εa= 3.8) as compared to the standard heat treatment (εa = 3.5). This procedure provides a significantly higher relative wear resistance of graphitized steel under dry sliding friction (εdsf = 3.6) than one could provide by routine quenching from a commonly used temperature (εdsf = 2), or by quenching from an elevated temperature (εdsf = 2.8) together with low-temperature tempering. The use of the proposed treatment procedures for graphitized steel should provide an increase in the durability of tools made of such a material and reduce the costs for purchasing it.
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Translated by O. Polyakov
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Malinov, L.S., Burova, D.V., Gomanyuk, V.D. et al. Increasing the Wear Resistance of Graphitized Steel by Obtaining Metastable Austenite in the Structure. J. Frict. Wear 42, 91–95 (2021). https://doi.org/10.3103/S1068366621020070
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DOI: https://doi.org/10.3103/S1068366621020070