Effect of slow cooling treatment on hot deformation behavior of GH4742 superalloy

The very poor hot workability of high-alloyed GH4742 superalloy is represented in the aspects of very narrow available deformation temperature range, high deformation-resistant force and poor ductility. In this paper, a special heat treatment to change the ingot microstructure is proposed to improve...

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Bibliographic Details
Published in:Journal of alloys and compounds 2009-11, Vol.486 (1), p.195-198
Main Authors: Lu, X.D., Du, J.H., Deng, Q., Zhong, Z.Y.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Cooling effects
Defects and impurities in crystals
microstructure
Deformation
Difficult deformation
Exact sciences and technology
Grain and twin boundaries
Grain boundaries
Hot workability
Microstructure
Nickel base superalloy
Physics
Slow cooling treatment
Solution heat treatment
Structure of solids and liquids
crystallography
Superalloys
Workability
Yield strength
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Summary:The very poor hot workability of high-alloyed GH4742 superalloy is represented in the aspects of very narrow available deformation temperature range, high deformation-resistant force and poor ductility. In this paper, a special heat treatment to change the ingot microstructure is proposed to improve the hot workability of the GH4742 superalloy. The γ′ phase with an appropriate size and morphology and tortuous grain boundary were obtained by slow cooling in the γ + γ′ two phases region after solution treatment. Modified microstructure induces that the hot deformation flow stress of GH4742 superalloy was decreased effectively and hot deformation plasticity was increased obviously.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2009.07.020