Microstructure and Wear Behavior of Laser Cladded Ni45 + High-Carbon Ferrochrome Composite Coatings

Abstract

A composite coating with enhanced mechanical properties including high hardness and excellent wear resistance was produced by laser cladding of mixed Ni45 and high-carbon ferrochrome powders on an ASTM 1045 steel substrate. Different quantities, ranging from 10 to 50 wt.% of high-carbon ferrochrome powder were added to the Ni45 powder to investigate the effect of mixture content on the cladding performance. The microstructure of the coatings were examined using scanning electron microscope, and the wear resistance was compared using a wear tester apparatus among the different cases. The results showed that the microstructure of the coating with 30 wt.% high-carbon ferrochrome content was mainly fine solid solution phase. With the increase of high-carbon ferrochrome content to 40 wt.% and above, cracks appeared on the cladding surface due to a large amount of chromium carbides formed during the process. The microhardness was enhanced remarkably by laser cladding the composite coating on the 1045 substrate, with 2.4 times higher than the hardness of the substrate when 30 wt.% high-carbon ferrochrome content was added. The best wear performance was achieved when the high-carbon ferrochrome content was 30 wt.%, demonstrating the smallest surface roughness and depth of wear marks. With further increased high-carbon ferrochrome content, microcracking and delamination were observed on the worn surfaces.

Microstructure of Rhenium Doped Ni-Cr Deposits Produced by Laser Cladding

“…According to the general behavior of abrasive wear, the wear resistance of metallic materials is often proportional to the Vickers hardness, which allows us to expect an enhanced wear resistance for the laser cladded coatings. The Ni45 + high-carbon ferrochrome composite coatings with carbon ferrochrome ranging from 10 to 50 wt.% were produced by laser cladding on an ASTM 1045 steel substrate [ 28 ]. The highest hardness of the clad was achieved with a 30 wt.% high-carbon ferrochrome content, and the microhardness of the composite coating was 2.4 times higher than that of the 1045 substrate.…”

Addition of Chromium and its effect on the microstructure and mechanical properties of laser-coated high carbon ferrochrome alloy on mild steel

“…Nevertheless, high carbon ferrochrome exhibits both high hardness and heat resistance. Apart from its abundant availability, ferrochrome is pro table in its generally low cost (Gu et al, 2020).…”

Influence of extra chromium addition on the microstructure, hardness, and corrosion behaviour of high carbon ferrochrome FeCrV15 deposited through laser cladding on steel baseplate for tillage application

“…Nevertheless, high carbon ferrochrome FeCrV15 exhibits both high hardness and wear resistance. Apart from its abundant availability, ferrochrome is profitable in its generally low cost [14]; however, its corrosion performance needs to be upgraded for better soil cultivation and mining application performance.…”