The large-scale flue gas turbine disk 01450mm of GH4738 (Waspaloy) nickel based superalloy has been successfully forged by hot deformation using 800MN die forging hydraulic press, which contributed to microstructure evolution precision control models combined with integrated simulation method at different deformation conditions. Constitutive equations and grain structure evolution models of GH4738 alloy were constructed and used in Deform3D for achieving integrated simulation of the complete forging process for the turbine disk (from preheating billet for free forging to die forging). The integrated numerical simulation was used for an experimental disk with the diameter of 0300 mm before forging the large-scale disk. Comparison between integrated simulations and actual forging results show that the simulated microstructure are in accordance with the actual results and the integrated simulation method excelled traditional simple single stage simulation. Finally, the integrated numerical simulation of the 01450 mm turbine disk die forging was also carried out through orthogonal experiment methods according to initial average grain size, temperatures, strain and strain rate and so on, and the optimal deformation parameters were chosen for forging using a 800MN hydraulic press. The results indicate that this method has shown a high correlation with actual microstructure distribution of GH4738 superalloy disk. Besides, the mechanical properties, grain sizes and microstructural homogeneity of the large-scale flue gas turbine disk have reached up to the specification level of HG/T3650-2012 (equivalent to AMS 5704G). In conclusion, the microstructure evolution models and integrated simulation methods of GH4738 alloy have provided a new method for making large-scale disk forgings.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.