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Abstract
The microstructure and mechanical properties of Incoloy A-286 forgings are sensitive to thermomechanical processing. In this research the hot deformation behaviour of A-286 superalloy is characterised in the temperature range of 1000–1100°C and strain rate range of 0·001–0·1 s−1 using the compression tests in order to develop a correlation between the grain size and the process parameters. It is found that at a strain rate of 0·001 s−1 in the temperature range of 1000–1100°C and at a strain rate of 0·01 s−1 in the temperature range of 1050–1100°C, the material exhibits dynamic recrystallisation (DRX), while at a strain rate of 0·01 s−1 and at the temperature of 1000°C and at a strain rate of 0·1 s−1 and in the temperature range of 1000–1100°C, the alloy exhibits the dynamic recovery (DR).