Constitutive Characteristic of Hot Deformation for Spray Formed Superalloy GH738

Abstract:

The hot deformation behaviors of spray formed superalloy GH738 were investigated by using of Gleeble-3500 simulator in the temperature range of 950~1200, with a strain rate of 0.13~6.5s^-1 and reduction of 50%. The corresponding flow curves were determined and hot deformed microstructures were observed. The results showed that the flow stress decreased with increasing deformation temperature or decreasing strain rate. A full dynamic recrystallization microstructures with fine-equiaxed grains were obtained at the temperature of 1100~1150 and strain rate of 2.6~6.5s^-1. The hot deformation activation energy Q was 580.81kJ.mol^-1, and the constitutive equation was derived by means of linear regression.

• Periodical: Materials Science Forum (Volumes 747-748)
• Pages: 569-574
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.747-748.569
• Online since: February 2013
• Authors: Yue Wang, Zhou Li, Wen Yong Xu, Hua Yuan, Na Liu, Zheng Jiang Gao, Shi Fan Tian, Guo Qing Zhang
• Keywords: Constitutive Equation, GH738, Hot Deformation, Spray Forming, Superalloy

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