Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Study of the tribological behaviour of a stainless-steel used in biomedical applications conducted with laser under different frequencies
Submission Author:
Ronaldo Cozza , SP
Co-Authors:
Giovanna Bernardes, Marcelo Macedo, Samuel Monteiro , Vikas Verma, Jorge Humberto Luna Dominguez, Ronaldo Cozza
Presenter: Ronaldo Cozza
doi://10.26678/ABCM.COBEM2023.COB2023-0027
Abstract
The objective of the present work is to study the bio-tribological behaviour of the ASTM F138 austenitic stainless-steel, under different conditions of surface treatment by laser of optical fiber doped with ytterbium. Initially, the surface of four specimens individually received the incidence of ytterbium-doped optical fiber laser – pulsed, with a wavelength of 1062 nm and average power of 50 W, under an application speed of 200 mm/s and under the frequencies of 80 kHz, 188 kHz, 296 kHz and 350 kHz, related to pulse duration time values of 167 ns, 40 ns, 23 ns and 20 ns, respectively. After, the four specimens were directed to sliding tribological wear tests, under a sliding distance of 12 m and a normal force value of 1 N. To simulate the chemical action of body fluids, an aqueous solution of PBS – Phosphate-Saline Buffer was used during the experiments, dripped between “body” and “counter-body” – its chemical composition is based on a saline solution containing sodium chloride – NaCl, potassium chloride – KCl, potassium phosphate – Na2HPO4 and monopotassium phosphate – KHPO4. The results revealed that the tribological behaviour of ASTM F138 austenitic stainless-steel was influenced by the pulse frequency of the pulsed ytterbium-doped optical fiber laser: under higher laser frequencies, lower volumes of wear were generated, because with the increase of the laser frequency application, an increase in the superficial hardness of the material was reported.
Keywords
biomaterial, ASTM F138 austenitic stainless-steel, Ytterbium -doped optical fiber laser, Wear, sliding wear, Tribological behaviour
