Development and Introduction of a New Composition of Wear-Resistant Cast Iron with Improved Performance Properties for Castings of Pump Parts

Abstract:

Improving the quality and reliability of machines is a necessary condition for the development of mechanical engineering. Most often, the main reason for the failure of machines is the wear of working parts. The reliability of the machines is ensured primarily by achieving high-quality materials of the working parts with the required level of mechanical properties.The short service life of parts reduces the economic efficiency of many machines and industrial equipment and results in irretrievable metal losses.Under conditions of wear that are not associated with large impact loads, white wear-resistant cast irons, which wear resistance is 5-10 times greater than structural steels, have shown themselves well.Grinding and the main processes of non-ferrous and ferrous metal ore-dressing, as well as coal, mining and chemical raw materials are associated with the need to process large volumes of ore slurry (pulps). For the implementation of complex dressing technological schemes at modern factories and the removal of refuse materials, centrifugal sand and soil pumps are widely used, the service life of which is limited. Impellers, bends, and sealing elements are the first to break down, resulting in significant repair costs and reduced productivity due to forced downtime [1-3].To replace worn out parts, it is necessary to remove the pumps from the operation, or install redundant pumps for the main technological stages, which takes up to 20-25 % of the productive time. If we take into account the fact that due to the wear of these parts, the pumps have lower productivity, then the total losses on a national scale are enormous.The low durability of the cast working parts of the pumps is related to the fact that the properties of used alloys do not always correspond to the operating conditions. But even parts made of the same cast iron composition and working under the same conditions have a different service life. This is due to the fact that changes in the concentrations of alloying elements within the grade composition strongly affect their properties [4-6].

• Periodical: Materials Science Forum (Volume 1052)
• Pages: 304-312
• DOI: https://doi.org/10.4028/p-ced6u8
• Online since: February 2022
• Authors: Michail G. Potapov*, B.B. Zaritskiy, N.A. Kuts
• Keywords: Carbides of Chromium and Other Elements, Hardness, Impact Strength, Strength, Structure, Wear Resistant Cast Iron

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