Author： Brooks J W
Publisher： Maney Publishing
ISSN： 1743-2847
Source： Materials Science and Technology, Vol.28, Iss.5, 2012-05, pp. : 528-531
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Abstract
A programme of experimental work has been carried out to determine the viscosity and friction performance for a range of borosilicate based glass forging lubricants for conditions relevant to the closed die forging operations used in the manufacture of aerospace parts in titanium and nickel alloys. A simple experimental method for the measurement of glass viscosities has been described and the measured viscosities and the friction coefficients have been used to provide an interpretation of the behaviour observed. Isothermal friction tests in the temperature range from 800 to 1100°C were carried out to determine the basic performance of the glass followed by tests representative of forging operations with the workpiece at 925°C and the dies between 300 and 600°C. It has been found that both boundary layer and hydrodynamic lubrication regimes occur for the temperatures and strain rates encountered during the forging of aerospace materials coated with glass lubricants.
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