On the surface integrity of machined aero-engine grade Ni-based superalloy billets produced by the field-assisted sintering technology (FAST) route
(2024) 7th CIRP Conference on Surface Integrity, CSI 2024 In Procedia CIRP 123. p.310-315- Abstract
High performance powder-based Ni-based superalloys exhibit exceptional in-service properties at elevated temperature, however this leads to reduced machinability and the potential for significant machining induced damage. Field assisted sintering technology (FAST) is capable of consolidating powder rapidly and efficiently, allowing for precise control of the microstructure via the dissolution of strengthening phases. In this study, subsolvus and supersolvus dwell temperatures were utilised to produce fine and coarse grain forms of an advanced Ni-based disk alloy. Surface integrity and machining forces were then evaluated after single point turning for a range of surface speeds. Higher cutting forces and lower depths of subsurface damage... (More)
High performance powder-based Ni-based superalloys exhibit exceptional in-service properties at elevated temperature, however this leads to reduced machinability and the potential for significant machining induced damage. Field assisted sintering technology (FAST) is capable of consolidating powder rapidly and efficiently, allowing for precise control of the microstructure via the dissolution of strengthening phases. In this study, subsolvus and supersolvus dwell temperatures were utilised to produce fine and coarse grain forms of an advanced Ni-based disk alloy. Surface integrity and machining forces were then evaluated after single point turning for a range of surface speeds. Higher cutting forces and lower depths of subsurface damage were generated when machining the fine grain (subsolvus) material when compared to the coarser grained (supersolvus) material. For both material conditions tested, higher surface speeds led to a reduced depth of subsurface deformation due to increased local temperatures, promoting workpiece softening. In addition, at higher cutting speeds the deformation of near surface γ' precipitates were observed to be greater. These results demonstrate that the FAST process can be utilised to control microstructure, and as a result, tailor the machinability of Ni-based superalloy material.
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- author
- Boyle, Henry ; Marshall, Kyle ; Epler, Mario ; Crawforth, Pete ; Christofidou, Katerina ; Norgren, Susanne LU and Jackson, Martin
- organization
- publishing date
- 2024
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- FAST, Machining, Nickel, Surface integrity, Turning
- host publication
- Procedia CIRP
- series title
- Procedia CIRP
- volume
- 123
- pages
- 6 pages
- conference name
- 7th CIRP Conference on Surface Integrity, CSI 2024
- conference location
- Bremen, Germany
- conference dates
- 2024-05-15 - 2024-05-17
- external identifiers
-
- scopus:85196804825
- ISSN
- 2212-8271
- DOI
- 10.1016/j.procir.2024.05.055
- language
- English
- LU publication?
- yes
- id
- 5e6dc6ba-6806-4242-a841-863e34973f6a
- date added to LUP
- 2024-09-04 10:56:06
- date last changed
- 2024-09-04 10:57:18
@inproceedings{5e6dc6ba-6806-4242-a841-863e34973f6a,
abstract = {{<p>High performance powder-based Ni-based superalloys exhibit exceptional in-service properties at elevated temperature, however this leads to reduced machinability and the potential for significant machining induced damage. Field assisted sintering technology (FAST) is capable of consolidating powder rapidly and efficiently, allowing for precise control of the microstructure via the dissolution of strengthening phases. In this study, subsolvus and supersolvus dwell temperatures were utilised to produce fine and coarse grain forms of an advanced Ni-based disk alloy. Surface integrity and machining forces were then evaluated after single point turning for a range of surface speeds. Higher cutting forces and lower depths of subsurface damage were generated when machining the fine grain (subsolvus) material when compared to the coarser grained (supersolvus) material. For both material conditions tested, higher surface speeds led to a reduced depth of subsurface deformation due to increased local temperatures, promoting workpiece softening. In addition, at higher cutting speeds the deformation of near surface γ' precipitates were observed to be greater. These results demonstrate that the FAST process can be utilised to control microstructure, and as a result, tailor the machinability of Ni-based superalloy material.</p>}},
author = {{Boyle, Henry and Marshall, Kyle and Epler, Mario and Crawforth, Pete and Christofidou, Katerina and Norgren, Susanne and Jackson, Martin}},
booktitle = {{Procedia CIRP}},
issn = {{2212-8271}},
keywords = {{FAST; Machining; Nickel; Surface integrity; Turning}},
language = {{eng}},
pages = {{310--315}},
series = {{Procedia CIRP}},
title = {{On the surface integrity of machined aero-engine grade Ni-based superalloy billets produced by the field-assisted sintering technology (FAST) route}},
url = {{http://dx.doi.org/10.1016/j.procir.2024.05.055}},
doi = {{10.1016/j.procir.2024.05.055}},
volume = {{123}},
year = {{2024}},
}