Enhancing Wear Resistance of Co-Cr-Mo-xC F75 Implants: The Role of Cooling Rate in Microstructural Evolution

Tyas Nayla Adhaisya – Metallurgical Engineering Department, University of Sultan Ageng Tirtayasa, Banten, 42435, Indonesia

Bajram Korsita – Metallurgical Engineering Department, University of Sultan Ageng Tirtayasa, Banten, 42435, Indonesia

Asep Ridwan – Industrial Engineering Department, University of Sultan Ageng Tirtayasa, Banten, 42435, Indonesia

Indah Uswatun Hasanah – Metallurgical Engineering Department, University of Sultan Ageng Tirtayasa, Banten, 42435, Indonesia

Alfirano – Metallurgical Engineering Department, University of Sultan Ageng Tirtayasa, Banten, 42435, Indonesia

Abstract: Cobalt (Co)-based metal alloys are widely used in biomaterial applications, particularly for joint replacements, due to their superior wear resistance compared to other metal implant materials like stainless steel and titanium. The wear resistance of as-cast Co-Cr-Mo alloys is influenced by precipitates formed during the alloy’s solidification process. To enhance hardness and wear resistance, researchers conducted experiments using heat treatment with varying cooling rates and carbon compositions to examine their effects on microstructure, hardness, and wear resistance. Specimens with carbon compositions of 0.08% and 0.15% were cut into 40 mm × 14 mm × 14 mm pieces and subjected to heat treatment at 1050°C for 6 hours with different cooling rates (DF, UT, and QC specimens). One QC specimen underwent additional aging at 815°C for 6 hours. After preparation, the specimens were machined and tested for wear resistance using the pin-on-disk method, with Co-Cr-Mo pins and alumina disks immersed in Hank’s solution. Eluted ions were analyzed using Inductively Coupled Plasma (ICP). The results showed that higher carbon composition increased hardness, but wear resistance did not correlate directly with hardness. The highest hardness value (362.562 HV) was observed in the 0.15% C alloy (QC specimen), while the lowest total ion elution (8.4881 ppm) occurred in the 0.15% C alloy (UT specimen).

Keywords: Co-Cr-Mo; Hardness; Heat treatment; Wear resistance; Pin on disk.

Full Text: PDF

DOI: https://doi.org/10.5281/zenodo.16730828

Publication Date: 05.07.2025  

How to Cite: Nayla Adhaisya, T., Pramono, A., Ridwan, A., Uswatun Hasanah, I., & Alfirano. Enhancing Wear Resistance of Co-Cr-Mo-xC F75 Implants: The Role of Cooling Rate in Microstructural Evolution. Journal of Integrated Engineering and Applied Sciences, 2025, 3(2), 236–248.

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