Effect of SiC addition on Laser‑based CoNi Binary Alloy Coatings on Ti‑6Al‑4V alloy
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Date
2024-04-25
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Springer
Abstract
This research explores the impact of variations in laser scanning speed and the incorporation levels of SiC-Ni-Co powders
on Ti-6Al-4V alloy using laser surface cladding technique. Key parameters, including a consistent laser power of 700 W,
a 4 mm beam spot size, a powder feed rate of 1.0 g/min, and a gas fow rate of 3 L/min, along with fxed powder composi tions, were maintained. The laser scanning speeds were adjusted to 0.4 m/min, 0.8 m/min, and 1.2 m/min. Microstructural
analyses were carried out using scanning electron microscopy (SEM) while Vickers microhardness was employed to assess
coating hardness, and corrosion properties were evaluated using a linear potentiodynamic polarization technique. Follow ing the corrosion attack, the protective oxides formed were identifed through SEM and X-ray difractometer (XRD). The
results revealed a strong metallurgical relationship between the clad layer and the substrate, demonstrating the efectiveness
of the laser-clad technique. Particularly, the highest laser scan speed exhibited the most signifcant improvements in hardness
and corrosion resistance. The coatings displayed an average hardness value of 1269.20 HV0.1, a notable fourfold increase
compared to the substrate's value of 334 HV0.1. Concerning corrosion, a clear correlation emerged between scan speed and
polarization resistance, confrming that higher scan speeds could lead to enhanced polarization resistance