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CHARACTERIZATION OF FRICTION COEFFICIENT AND HEAT PARTITION COEFFICIENT BETWEEN AN AUSTENITIC STEEL AISI304L AND A TiN-COATED CARBIDE CUTTING TOOL

This work aims at characterizing the tribological behavior of an AISI304L austenitic steel and a TiN-coated carbide tool under extreme conditions corresponding to the one occurring at the cutting tool-work material in dry machining. A specially designed open tribometer has been used to characterize the friction coefficient, heat partition coefficient and adhesion in the contact versus sliding velocity and contact pressure. It has been shown that sliding velocity is the most influential parameter. An increase of sliding velocity induces a great decrease of friction coefficient, whereas contact pressure seems to play a secondary role on the friction coefficient. Adhesion is minimized when sliding speed increases. Heat partition coefficient decreases with sliding velocity, which tends to decrease the ratio of heat transmitted to cutting tools when sliding velocity increases. Finally, this work provides quantitative data of friction and heat partition coefficients versus sliding velocity and contact pressure in order to be implemented in any analytical or numerical cutting model.