Abstract
The high-velocity oxy-fuel (HVOF) technique has been extensively used for the deposition of hard metal coatings. The main advantage of HVOF, compared to other thermal spray techniques, is its ability to accelerate the melted powder particles of the feedstock material to a relatively high velocity, leading to good adhesion and low porosity. To further improve the surface properties, a mechanical machining process is often needed; however, a key problem is that the high hardness of the coating makes the polishing process expensive (in terms of time and tool wear). Another approach to achieving surface modification is through interaction with a thermal source, such as a laser beam. In this research, the effects of laser scanning rate, scanning strategy, and number of loop cycles were investigated on an HVOF-coated surface. Cr3C2-25(Ni20Cr) was selected as the coating and Nd:YVO4 as the laser source. The results demonstrate the significance of the starting coating morphology and how the laser process parameters can be tuned to generate different types of modifications, ranging from polishing to texturing.
Highlights
There exists an increasing need to reduce and control friction and wear, in order to extend the lifetime of mechanical systems to improve their efficiency and reliability; in particular, surface modifications play a fundamental role in enhancing the performance of mechanical parts
To enhance knowledge regarding this topic, in this article, we investigate the effect of laser irradiation on a Cr3 C2 -25(Ni20Cr) coating realized with high-velocity oxy-fuel (HVOF)
Three different experimental series were designed to analyze the interaction between the laser source and the HVOF-treated sample
Summary
There exists an increasing need to reduce and control friction and wear, in order to extend the lifetime of mechanical systems to improve their efficiency and reliability; in particular, surface modifications play a fundamental role in enhancing the performance of mechanical parts. When considering the use of lasers, the modification of surface properties plays an important role in optimizing a material’s performance for a given application. Laser irradiation has been shown to induce changes in local chemistry, local crystal structure, and local morphology, all of which affect how a material behaves in a given application [1]. Laser polishing is a finishing process which mainly includes the melting of a thin layer of a metal’s surface without any cracks or surface defects [5]. This process aims to smooth the peaks that are found on the metal surface to an intermediate range
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