Avtomaticheskaya Svarka (Automatic Welding), #6, 2019, pp.44-50
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, V.O. Kochura
E.O. Paton Electric Welding Institute of the NAS of Ukraine.
11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: email@example.com
The paper presents the procedure and results of investigation of hot hardness of deposited high-chromium cast irons with different level of alloying of 450Kh30M, 500Kh22B7, 500Kh22B7M7V2F, 300Kh25S3N2G2 type as well as 500Kh40NS2GRTs nickel-carbide-chromium alloy. It is determined that hot hardness of deposited metal to significant extent depends on presence and types of carbides in metal structure. With relatively low-alloy high-chromium cast irons the hardness drops at rise of temperature and increases at chromium content up to 30% and carbon to 5%. Alloys doped with chromium, niobium, molybdenum, tungsten and vanadium keep 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 solid cubic niobium carbide. Nickel-carbide-chromium alloy preserves high hardness up to 650 °C temperature due to presence of high concentration of higher chromium carbides in a nickel-based matrix. Wear resistance of deposited alloys drops with rise of temperature in accordance with drop of deposited metal hardness. 12 Ref., 3 Tabl., 3 Fig.
Keywords: hot hardness, flux-cored strips, surfacing, high-chromium cast irons, nickel-carbide-chromium alloy, wear resistance
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