Abstract
High velocity oxygen-fuel (HVOF) prepared CrC-based hardmetal coatings are generally known for their superior wear, corrosion, and oxidation resistance. These properties make this coating attractive for application in industry. However, under some loading conditions and in aggressive environments, the most commonly used NiCr matrix is not sufficient. The study is focused on the evaluation of dynamic impact wear of the HVOF-sprayed Cr3C2-25%NiCr and Cr3C2-50%NiCrMoNb coatings. Both coatings were tested by an impact tester with a wide range of impact loads. The Wohler-like dependence was determined for both coatings’ materials. It was shown that, due to the different microstructure and higher amount of tough matrix, the impact lifetime of the Cr3C2-50%NiCrMoNb coating was higher than the lifetime of the Cr3C2-25%NiCr coating. Differences in the behavior of the coatings were the most pronounced at high impact loads.
Highlights
In many branches of industry, the surfaces of components are exposed to mechanical loading, the influence of an aggressive environment, high temperature, or even a combination of these features
The technology of thermal spraying earns its position by offering a versatile solution for various kinds of applications and types of loading [1]
The aim of this work is the complex study of impact wear and dynamic impact load limits of the high-velocity oxygen fuel (HVOF)-sprayed Cr3 C2 -25%NiCr and
Summary
In many branches of industry, the surfaces of components are exposed to mechanical loading, the influence of an aggressive environment, high temperature, or even a combination of these features.To increase their lifetime, the surface of such components used to be coated by protective coatings.Among others, the technology of thermal spraying earns its position by offering a versatile solution for various kinds of applications and types of loading [1]. In many branches of industry, the surfaces of components are exposed to mechanical loading, the influence of an aggressive environment, high temperature, or even a combination of these features. The thermally sprayed chromium-based coatings were evaluated many times, in regards to the used deposition technology [6,7], the influence of deposition parameters [8], and morphology and phase composition of feedstock powder [9]. Their wear resistance under various loading conditions, including the high temperature, was analyzed [3,7,10]
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