Repository logo
 

Occurrence of a brass texture and elastic anisotropy in laser blown powder processed superalloy IN718

Accepted version
Peer-reviewed

No Thumbnail Available

Type

Article

Change log

Authors

Markanday, JFS 
Carpenter, MA 
Jones, NG 
Thompson, RP 
Rhodes, SE 

Abstract

Challenges are encountered with the laser-blown-powder directed-energy-deposition (LBP-DED) of high-performance alloys such as IN718. Complications that arise include the formation of undesired phases, irregular microstructure, and pronounced texture leading to anisotropic elastic properties. To mitigate these issues, deposition parameters and post-processing treatments must be carefully selected to achieve the desired properties in the final product. In this study it is shown that a Brass texture component ({110} <211>) can be achieved in LBP-DED IN718. EBSD analyses indicate that this texture is enhanced through partial recrystallisation following selected heat treatments, increasing the degree of microstructural anisotropy. Interestingly, resonant ultrasound spectroscopy (RUS) results indicate a decrease in the elastic anisotropy with recrystallisation. This is hypothesised to be a result of the pronounced Brass texture leading to pseudo-isotropic elastic properties along the cubic axes. Further insight into the kinetics of this process have been obtained with in-situ high temperature RUS measurements

Description

Keywords

Nickel alloys, Laser methods, Electron microscopy, Texture, Other

Journal Title

Materials Science and Engineering: A

Conference Name

Journal ISSN

0921-5093
1873-4936

Volume Title

825

Publisher

Elsevier BV
Sponsorship
EPSRC
Relationships
Is supplemented by: