Development of thermal processing map and analysis of hot deformation mechanism of cast alloy inconel 625

Gleeble 3800 testing machine was used to conduct a series of compression tests of cast alloy Inconel 625. Then thermal processing map was developed based on dynamic material model (DMM), which was used to analyze the hot deformation mechanism with the combination of true stress-true strain curve and microstructure. The results show that, for cast alloy 625, 1273-1363K, 0.1-5.05s(-1) is the dynamic recovery (DRV) domain, 1363-1453K, 0.1-5.05s(-1) is the partly dynamic recrystallization (DRX) domain and 1400-1453K, 5.05-10s(-1) is the completely dynamic recrystallization domain. When it is deformed at 0.1-10s(-1), the critical temperature of DRX is between 1373K and 1423K and the critical strain is between 0.4 and 0.6. The conditions without flow instability are 1400-1453K, 5.05-10s(-1).