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High temperature deformation behavior of a Ni 30 Fe 53 Co 17 alloy, with its extraordinary low coefficient of thermal expansion less than 10x10 -6 K 1 at temperatures ranging from room temperature to 673K, was investigated by conducting a series of compression tests. From an empirical processing map, the appropriate working temperature-strain rate combination for optimum -forming was deduced to be in the ~1373K, 10 -2 s 1 region. This region has a relatively high power dissipation efficiency, greater than 0.36. Furthermore, open die forging of a 100mm diameter billets was performed to confirm the variation of thermo-physical properties in relation to microstructure. The coefficient of thermal expansion was found to increase considerably with increasing the open die forging temperature and decreasing the cooling rate, which in turn provides a drastic increase in the average grain size. Key Words : Ni-Fe-Co Alloy, High Temperature Deformation, Open Die Forging, Coefficient of Thermal Expansion

Influence of High Temperature Deformation Process Variables on the Microstructure and Thermo-physical Properties of a Ni-Fe-Co Alloy