2 research outputs found
Mechanical, wear and corrosion behaviours of laser additive manufactured iron-based heterogeneous composite coatings for tillage tools
Steel is commonly used in engineering components, and it has a high tendency to wear and corrosion attacks when exposed to unfavourable working conditions. The use of chromium-vanadium-iron-rich carbide reinforced iron-based hard facings has become more important in improving the corrosion and wear resistance of such steel subjected to abrasive and impact conditions. In this study, the chromium-vanadium-iron carbide reinforced coatings were developed using in-situ by depositing FeCrV15+Cr powder through laser cladding on carbon steel. The influence of the reinforcement on the microstructure of the coating in relation to its laser processing condition and extra chromium addition was investigated. Furthermore, the effect of the coating's reinforcement on the hardness, microstructures, anti-corrosion, and anti-wear properties of the carbon steel used in tillage and mining operations was investigated. The result is a defect free deposits with a solid metallurgical attachment to the substrate and improved microhardness. FeCrV15 deposits had a wear-resistant (with a wear rate of 2.42 × 10−6 mm3/N/m) and anti-corrosion capability (with a corrosion rate of 0.001869 mm/yr) that were several folds higher than the steel substrate (with wear rate of 1.72 × 10−3 mm3/N/m and corrosion rate of 0.1168 mm/yr). The general grain refinement of the FeCrV15 deposits was richly enhanced in the iron base matrix. This resulted in outstanding wear and corrosion resistance attributed to the better production of VC–Cr3C2–Cr7C3 particles and better grain refinement of the microstructural formation
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Effect of Energy Density on the Consolidation Mechanism and Microstructural Evolution of Laser Cladded Functionally-Graded Composite Ti-Al System
The engagement of additive manufacturing (AM) technology in developing
intermetallic coatings involves additional heat treatment with a view to obtaining desirable
microstructure and mechanical properties. This eventually increases the lead time and the
manufacturing cost. To address these challenges, this study explores the fabrication of gradient
and laminar structures of titanium aluminide (Ti-Al) composite coatings deposited on Ti-6Al-4V
substrate via a single step laser cladding (LC). The alterations in microstructural properties,
chemical composition and phase analysis of the coatings reinforced with TiC were investigated as
a function of laser energy density. Evaluation of the deposited samples reveals that FGM
composite clads were fabricated from Ti-Al blended with TiC when LED was set at 17.50 J/mm2
.
At the selected LED, a thermo-positive reaction between the constituents’ materials was induced
and it resulted in the formation of intermetallic compounds (e.g. Ti2AlC, and 2 matrix phases)
with a microhardness more than that of the substrate (Ti-6Al-4V alloy). This study provides new
insights on the selection of process parameters for the coating manufacturers while employing low
cost- and time-effective LC process for fabricating functional graded Ti-Al coatings.Mechanical Engineerin