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Title: Features of frictional treatment of the composite NiCrBSi-Cr3 C2 laser clad coating
Authors: Soboleva, N. N.
Makarov, A. V.
Zavarzina, E. P.
Skorynina, P. A.
Malygina, I. Y.
Issue Date: 2020
Publisher: Institute for Metals Superplasticity Problems of Russian Academy of Sciences
Citation: Features of frictional treatment of the composite NiCrBSi-Cr3 C2 laser clad coating / N. N. Soboleva, A. V. Makarov, E. P. Zavarzina, et al. — DOI 10.22226/2410-3535-2020-4-506-511 // Letters on Materials. — 2020. — Vol. 10. — Iss. 4. — P. 506-511.
Abstract: The authors conducted a comparative analysis of the effectiveness of frictional treatment with a sliding indenter of a NiCrBSi coating and a composite coating formed by laser cladding of a powder mixture of 85 wt.% NiCrBSi and 15 wt.% Cr3 C2 . The criteria were intensive strain hardening, favorable compressive stresses, and low surface roughness. Frictional treatment with an indenter made of cubic boron nitride at a load of 350 N provides less intense deformational hardening of the NiCrBSi-Cr3 C2 coating (microhardness growth from 900 to 940 HV 0.025) than the NiCrBSi coating (from 570 to 850 HV 0.025). This is due to the significantly higher initial hardness of the composite coating, because its structure, in addition to the phases characteristic of the NiCrBSi coating, contains large primary Cr3 C2 carbides, which did not dissolve during cladding, as well as elongated Cr23 C6 carbides, precipitated during cooling from a solid solution supersaturated with chromium as a result of the partial dissolution of Cr3 C2 carbides during cladding. Frictional treatment also results in a lower level of compressive residual stresses (−250 MPa) on the composite coating surface than on the NiCrBSi coating surface (−390 MPa). In contrast to frictional treatment of the NiCrBSi coating, when a smoothed surface with a nano-roughness is formed (Ra = 60 nm), frictional treatment of the composite coating forms a surface with a higher roughness (Ra = 310 nm) due to the creation on the surface of supporting “island frame” of large Cr3 C2 chromium carbides protruding 2 – 5 μm. © 2020, Institute for Metals Superplasticity Problems of Russian Academy of Sciences. All rights reserved.
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85097440407
PURE ID: 20220576
ISSN: 22185046
DOI: 10.22226/2410-3535-2020-4-506-511
metadata.dc.description.sponsorship: The work was performed with the financial support of the Grant from the President of the Russian Federation for young scientists MK-391.2019.8 and at the expense of funds making up the income from the trust management of the target capital for the development of UrFU, formed with the participation of UMMC-Holding Corp, as well as within the state order for IES UB RAS (AAAA-A18-118020790147-4) and IMP UB RAS (AAAA-A18-118020190116-6 and АААА-А19-119070490049-8). The experimental research was performed on the equipment of the Plastometriya Collective Use Center of IES UB RAS.
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