Authors : Zainab Mohammed Lafta, Hayder H.J. Jamal Al-Deen and Ekbal Mohammed Saeed
Abstract: Co-Cr-Mo alloys represent a very important group of materials used for medical applications due to its strength, corrosion resistance and biocompatibility. In this research, the ultrasonic surface treatment was carried out for F75 alloy prepared by Powder Metallurgy route (PM) using ultrasonic homogenizer under different conditions. Taguchi experimental design concept, L9 (33) orthogonal array was utilized in designing the experiments and calculate the Signal to Noise (S/N) ratio. Analysis of Variance (ANOVA) was carried out to research the significant conditions affecting the hardness, surface roughness, wear rate and corrosion rate in Hanks solution. ANOVA analysis results show that power was the most effective factor for hardness, wear rate and corrosion rate in Hanks solution followed by time and concentration while time was the most effective factor for surface roughness followed by power and concentration. According to Taguchi analysis, the optimum conditions that must be used in ultrasonic surface treatment for CoCrMo alloy are: time (90 min), power (80%), concentration (4 g mL-1) to get maximum hardness and minimum wear rate. But, the minimum surface roughness can be achieved with: time (90 min), power (80%), concentration (2 g mL-1). While minimum corrosion rate in Hanks solution can get with: time (90 min), power (60%), concentration (6 g mL-1). In addition, mathematical models were developed successfully for prediction of properties with acceptable error percentage.
Zainab Mohammed Lafta, Hayder H.J. Jamal Al-Deen and Ekbal Mohammed Saeed, 2019. Optimization of Ultrasonic Surface Treatment Condition of CoCrMo (F75) Alloy using Taguchi Method. Journal of Engineering and Applied Sciences, 14: 10298-10304.