The Paton Welding Journal, 2022, №04



2022 №04 (01)

DOI of Article 10.37434/tpwj2022.04.02

2022 №04 (03)

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The Paton Welding Journal, 2022, #4, 8-13 pages

Features of the structure and properties of metal layers deposited with pre-application of titanium and boron carbides

V.V. Peremitko, I.V. Kolomoyets, V.I. Sukhomlyn

Dnipro State Technical University 2 Dniprobudivska Str., 51900, Kamianske, 2, Ukraine

Abstract
Uneven wearing of working surfaces of parts, operating under friction, is a common cause for beginning of renovation and replacement times. One of the methods to avoid this problem is formation of surfaces of a variable composition and properties by arc surfacing. The work presents comparative analysis of the hardness and structure of the metal, deposited with pre-application of titanium and boron carbides on the processed surfaces. These materials were selected, proceeding from their impact on the deposited metal mechanical properties. The hardness, structure and composition of the deposited metal were studied. Hardness dependence on the heat input and material consumption in individual zones of the bead cross-section was analyzed. Regularities were established between accumulation in the formed beads of material pre-applied on the processed surface and the significance of structural transformations. A similar influence of both the carbides on the deposited metal structure was found. Bead metal hardness is 1.5 times higher at B4C application, than when TiC is used. X-Ray spectral microanalysis revealed the influence of free carbon, formed as a result of compound decomposition, on structural transformation in the deposited metal. It was found that the largest accumulations of bainite are characteristic for zones with the highest carbon content. It was determined that pre-application of carbides, using the most common surfacing materials, allows producing deposited metal, matching by its properties the metal deposited with PP-Np-152 wire.
Keywords: arc surfacing, solid wire, fused flux, titanium carbide, boron carbide, pre-application, local fixation, hardness, structure

Received: 19.04.2022
Accepted: 30.06.2022

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