MORPHOLOGICAL ANALYSIS OF NI-CR ALLOYS TREATED VIA CO2 LASER

• Main Author: GIOVANNI LUSOM ANAK ANDREW, -
• Format: Final Year Project Report
• Language: English; English
• Published: Universiti Malaysia Sarawak 2022
• Subjects: TP Chemical technology
• Online Access: http://ir.unimas.my/id/eprint/39368/1/FYP_Giovanni%20Lusom%20anak%20Andrew%20-%20%2024pages.pdf; http://ir.unimas.my/id/eprint/39368/4/Giovanni%20Lusom.pdf; http://ir.unimas.my/id/eprint/39368/

Nickel-Chromium (Ni-Cr) is a highly used in the engineering field as heating elements in machineries due to its property of being able to resist oxidation, high temperature corrosion and wear. Nevertheless, Ni-Cr tends to lose its initial ductility and hardness if extreme pressure, temperature and external force are being applied to it for a long period of time due to the alterations in the molecular arrangment of the alloy. Hence, this experiment aims to tackle the problem related to decrement in the performance of Ni-Cr by treating the surface of Ni-Cr composite via employing low-power Carbon Dioxide, CO2 laser. The objectives of this research are to prepare Ni-Cr pellets via cold compaction pelletizing device, to vary the parameters onto Ni-Cr alloy pellets and to analyze the surface morphology and tensile strength of the laser-treated Ni-Cr alloys via Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray (EDX), X-Ray Diffraction (XRD), Porosity Test and Vickers Hardness Test. The initial step in the experiment methodology is material preparation. This is followed by pelletizing, sintering and laser surface treatment. Once the pellets are done the analyses are done on the composites. This research proves that low power CO2 laser can be considered as a way to treat Ni-Cr alloys due to the changes in the structures of the pellets and the physical properties.