Effect of True Strain on Processing Maps for Processed Ni-Based Superalloy below γ΄-Transus Temperature

Guo Bao Yang; Ze Kun Yao; Yan Hui Liu; Yang Nan; Yong Quan Ning

doi:10.4028/www.scientific.net/AMR.941-944.1459

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 941-944Effect of True Strain on Processing Maps for...

Effect of True Strain on Processing Maps for Processed Ni-Based Superalloy below γ΄-Transus Temperature

Abstract:

Isothermal compression tests were carried out on GH4133B superalloy at 940–1060°C (below nominal γ΄-transus temperature of 1080°C) and 0.001–1.0s^-1. The processing maps were constructed to evaluate the efficiency of power dissipation (η) and recognize the flow instability regimes. Our investigations demonstrate that true strain takes great effect on processing maps' evolution. At 1020°C/1.0s^-¹, the efficiency value η undergoes a small decline at low strains, and then increases linearly from 0.26 to 0.58 at high strains. However, the efficiency value remains high constant (η=0.40) with the increased strain under the condition of 980°C/0.001s^-1. As a result, hot deformation can be carried out firstly at 980°C/0.001s^-1 with small strain about 0.35 and then carried out at 1020°C/1.0s^-1 to get fine homogeneous microstructure. There are two instability regimes respectively located around 940°C/1.0s^-¹ and 1060°C/0.001s^-¹ when the strains are 0.05–0.40. Moreover, there is another instability regime located around 1060°C/1.0s^-¹ when the strains are 0.45–0.69.