Effect of sic addition on laser‑based coni binary alloy coatings on ti‑6Al‑4v alloy.
Adesina, Olanrewaju Seun Popoola, Abimbola Patricia Farotade, Gabriel Ayokunle Obadele, Babatunde Abiodun Sanyaolu, Olufemi Oluseun Jeje, Samson Olaitan Rominiyi, Azeez Lawan
Adesina, Olanrewaju Seun
Popoola, Abimbola Patricia
Farotade, Gabriel Ayokunle
Obadele, Babatunde Abiodun
Sanyaolu, Olufemi Oluseun
Jeje, Samson Olaitan
Rominiyi, Azeez Lawan
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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 flow rate of 3 L/min, along with fixed powder compositions, 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. Following the corrosion attack, the protective oxides formed were identified through SEM and X-ray diffractometer (XRD). The results revealed a strong metallurgical relationship between the clad layer and the substrate, demonstrating the effectiveness of the laser-clad technique. Particularly, the highest laser scan speed exhibited the most significant 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, confirming that higher scan speeds could lead to enhanced polarization resistance.
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Date
2024-05-07
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Springer
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Keywords
Laser surface cladding (LSC) technique, SiC-Ni-Co powders, Microstructure, Corrosion resistance, Ti-6Al-4V