Abstract
Ti-6Al-4V titanium alloy is widely used in industrial applications such as aeronautic and aerospace due to its good mechanical properties at high temperatures. The aim of the work is to determine the heat capacity of the thermal cycled titanium alloy. The cylindrical specimens of dimension 3 ± 0.1 mm in diameter and 2.5 ± 0.1 mm in length were machined from the CNC machine. The specimens were subject to two different types of heat treatments (Solution treated and annealed). First type of heat treatment (annealing) is processed by heating the specimen to a temperature of 7500 C for 4 hours and it is cooled in the furnace to reach the atmospheric temperature. Second type of heat treatment (solution treating) is processed by the specimen is heated to a temperature of 9750 C for 1 hour and it is quenched in a solution containing water with 5% of caustic soda. After quenching (delay of 6 second), aging was done at 4500 C for 4 hours and then it is furnace cooled to reach atmospheric temperature The heat treated specimens were thermal cycled in a specially designed thermal cycling apparatus for different cycles Heat flow and the flow of energy into or out of the sample as a function of temperature was measured by using Differential Scanning Calorimetry (DSC). The heat flow response is recorded as a function of actual sample temperature range from -120˚ C to 380˚ C. The measurements of the heat capacity by DSC with an accuracy of ±2% have been reported. This study restrict the use of DSC as a truly quantitative calorimetric technique and concentrates mainly on the practical set of experimental heat capacity data measured over a temperature range for different aerospace materials being used/developed indigenously for the Indian Space Programme. Keywords: Thermal Analysis, Differential Scanning Calorimeter, Specific Heat, Heat Treatment
Highlights
Ti-6Al-4V materials are used for aerospace applications, because of the high strength-to-weight ratio, enhanced mechanical and thermal properties over conventional materials
This study restricts the use of Differential Scanning Calorimetry (DSC) as a truly quantitative calorimetric technique and concentrates mainly on the practical set of experimental heat capacity data measured over a temperature range for different thermal cycled Ti-6Al-4V materials
Nitrogen was used as a purge gas at the ow rate of 50.0 ml/min. e DSC traces of the heat capacity and total heat as a function of the temperature were plotted
Summary
Ti-6Al-4V materials are used for aerospace applications, because of the high strength-to-weight ratio, enhanced mechanical and thermal properties over conventional materials. This study restricts the use of DSC as a truly quantitative calorimetric technique and concentrates mainly on the practical set of experimental heat capacity data measured over a temperature range for different thermal cycled Ti-6Al-4V materials. Thermal analysis refers to the measurement of changes in properties of substances under a controlled temperature program. The performance of the ‘Thermal Control System’ (TCS) totally depends upon the thermal behaviour of the materials used in its elements. The external heat load variation to the spacecraft causes a rise in temperature, which is inversely proportional to the thermal capacity. Higher thermal capacity will cause a lower temperature swing during an orbit.
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