Abstract
By methods of modern physical materials science the investigations analysis of phase composition, defect substructure, mechanical and tribological properties of Cr-Nb-C-V containing coatings formed in surfacing on martensitic wear resistant steel Hardox 450 were carried out. It was shown that surfacing resulted in the formation of high strength surface layer 6 mm in thinness. This layer had wear resistance 138 times greater than that of the base and friction coefficient 2.5 times less. Having analyzed the deflected mode of the deposited material in conditions of friction, a conclusion is drawn that plastic shear deformation is localized in the surface layer due to the high friction factor, as the result, scratches are formed. The maximum of tangential stress is deflected deep into the material provided that friction factor is low. On the basis of the investigations by methods of X-ray structural analysis and transmission diffraction electron microscopy it was shown that increase strength and tribological properties of surfacing metal were caused by its phase composition and state of defect substructure, namely, availability of interstitial phases (more than 36%) and martensitic type of a-phase structure.
Highlights
At present surface and subsurface layers of materials are to meet a lot of requirements because of growing production of high-duty products [1]
Wear factor V is calculated as the ratio of the cut out material volume [16] to the sample load and friction length, and friction factor μ
Analyzing the data, presented in this figure, it should be noted that a high-strength 6 mm thick surface layer is synthesized under weld deposition; and microhardness of this layer varies from 9.5 to 11.5 GPa
Summary
At present surface and subsurface layers of materials are to meet a lot of requirements because of growing production of high-duty products [1]. These products are used in conditions of enormous loading the surface layers, where most defects are detected. Such processes as wear, corrosion, crack initiation and propagation are the most intense in surface layers; that is the major cause of product performance degradation. Weld deposition of wear and corrosion resistant materials is easy-to-implement [7] This procedure makes it possible to process significant areas of material; that is important for large-dimensional products
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