DOI: 10.18503/1995-2732-2021-19-4-45-55
Abstract
The relevance of the research topic. The paper provides a rationale for relevance of the development of technology for manufacturing valve seats of internal combustion engines from materials with predicted heat resistance and impact wear resistance based on atomized powders of high-chromium steels. Research methods. To test the materials under study, an advanced installation was used to evaluate the impact wear resistance at a given impact energy and heating temperature in gas corrosion. Results and scientific significance. It has been shown that in addition to external factors the oxidation intensity of the surface of the powder products is influenced by the chemical potential of the atoms of the alloy components and heated gas molecules, depending on the microrelief of the powder particles, the volume and configuration of the pores and the methods of preparation of the batch. The analysis of the tests on the heat resistance of the samples, when heated within the range of 600–1000°С, showed that sintered high-chromium steels with a density of less than 6.0–6.5 g/cm3 from a mixture of powders and alloys have the least heat resistance. With an increase in the density of alloys from atomized powders of high-chromium steels to 7.1–7.2 g/cm3, heat resistance and impact wear resistance are significantly improved. Practical significance of the research. It has been found that when adding nickel powder within 10–20% and performing subsequent mechanical activation of the batch based on the atomized powder RKh-NSKh23 the density of the pressings slightly increases and the heat resistance and impact wear resistance of sintered and hot-deformed alloys significantly increases. It has been revealed that the sintered bimetallic samples with a working layer based on atomized high-chromium powders of high-speed steels RKh-NSKh23 have a higher impact wear resistance of the working layer than similar homogeneous samples.
Keywords
High-chromium steels, atomized powder, sintering, heat resistance, impact wear resistance, chemical potential, hot forging.
For citation
Gasanov B.G., Babets A.V., Baev S.S. Influence of a Chemical Composition on Heat Resistance and Impact Wear Resistance of Materials Based on Atomized Powders of High-Chromium Steel.Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2021, vol. 19, no. 4, pp. 45–55. https://doi.org/10.18503/1995-2732-2021-19-4-45-55
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