About this Abstract |
Meeting |
Superalloys 2021
|
Symposium
|
Superalloys 2021
|
Presentation Title |
Microstructural Control and Optimisation of Haynes 282 Manufactured through Laser Powder Bed Fusion |
Author(s) |
Katerina A. Christofidou, Hon Tong Pang, Wei Li, Yogiraj Pardhi, Colin Neil Jones, Nick G. Jones, Howard J. Stone |
On-Site Speaker (Planned) |
Katerina A. Christofidou |
Abstract Scope |
The microstructure and properties of alloy Haynes 282 produced through laser powder bed fusion were investigated as a function of the post-deposition heat-treatment. Scanning electron microscopy and X-ray diffraction were utilised to characterize the microstructure, whilst electro-thermal mechanical testing was used to evaluate the tensile and creep properties at 900˚C. In the as-deposited state, the initial microstructure consisted of the ã and ãʹ phases along with M6C and M23C6 carbides. These carbides were observed to govern the recrystallization behavior of the material and resulted in a minimum recrystallization temperature of 1240˚C. Following post-deposition heat-treatments the microstructures consisted of a monomodal distribution of ãʹ with M6C and M23C6 carbides along the grain boundaries. Tertiary ãʹ particles were found to form in the vicinity of carbides in samples that employed a ãʹ super-solvus step prior to ageing at 788˚C. The tensile properties were found to be similar in all heat-treated states, consistent with the minimal differences observed in the microstructures. In contrast, significant differences in the creep behavior of the alloy was observed following the different heat-treatments, although no correlation with the microstructures was observed. |
Proceedings Inclusion? |
Undecided |