Abstract
Microstructure observation suggested that slowing down the cooling rate influence γ′ precipitation obviously and consequently produces coarse γ′ which could significantly improve plastic flow behavior that helps to break down the cast microstructures of wrought superalloys with high volume fraction of γ′. After full recrystallization, a modified dual-phase microstructure containing refined γ matrix plus coarse γ′ shows superplasticity during subsequent hot deformation. It also proved that soft lagging casing method is effective to retard the surface heat radiation of the pre-heated ingots during cogging operation.
Highlights
To further improve the efficiency of combustion processes, the maximum operating temperature has to be elevated
The predominant impact is the loss of pyroplasticity because of the precipitates’ hardening effect by γ during hot working
The other significant influence is that the temperature windows for hot working was shrunk since the temperatures for dynamic recrystallization to cause flow softening ascend while the incipient melting temperatures descend as the result of aggravated hot workability [7,8,9]
Summary
To further improve the efficiency of combustion processes, the maximum operating temperature has to be elevated. The other significant influence is that the temperature windows for hot working was shrunk since the temperatures for dynamic recrystallization to cause flow softening ascend while the incipient melting temperatures descend as the result of aggravated hot workability [7,8,9]. Those negative effects have been being the bottle neck in the production of wrought superalloys with higher Al and Ti contents. This paper review the current work on improving the plastic flow behavior of wrought Ni-based superalloys with high Al and Ti contents by pre-modifying the microstructures with coarse γ. A soft lagging casing method was proposed to retard the surface heat radiation of the pre-heated ingots during the operation in normal hydraulic press
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