TPWJ, 2019, #6, 38-42 pages
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue #6, 2019 (June)
Effect of temperature on hardness and wear resistance of high-chromium cast irons deposited with flux-cored strips
A.P. Voronchuk, A.P. Zhudra, A.V. Petrov and V.O. Kochura
E.O. Paton Electric Welding Institute of the NAS of Ukraine
11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: firstname.lastname@example.org
The paper presents the procedure and results of investigation of hot hardness of the deposited high-chromium cast irons with different level of alloying of 450Kh30M, 500Kh22B7, 500Kh22B7M7V2F, 300Kh25S3N2G2 type, as well as nickel-chromium-carbide alloy 500Kh40N40S2GRTs. It is determined that hot hardness of deposited metal to a significant extent depends on the presence and types of carbides in metal structure. For relatively low-alloyed high-chromium cast irons, hardness drops at temperature rise and increases at the content of chromium up to 30 % and that of carbon up to 5 %. Alloys doped with chromium, niobium, molybdenum, tungsten and vanadium preserve high hardness up to 650 °C temperature. Niobium is important for indicated alloys. It plays a role of modifier delaying growth of primary chromium carbides, and forming hard cubic niobium carbide. Nickel-chromium-carbide alloy preserves high hardness up to 650 °C temperature due to the presence of high concentration of higher chromium carbides in a nickel-based matrix. Wear resistance of deposited alloys decreases with the rise of temperature in accordance with lowering of deposited metal hardness. 12 Ref. 3 Tables, 3 Figures.
Keywords: hot hardness, flux-cored strips, surfacing, high-chromium cast irons, nickel-carbide-chromium alloy, wear resistance
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