Journal article
On the influence of alloy composition on the additive manufacturability of Ni-Based superalloys
- Abstract:
- The susceptibility of nickel-based superalloys to processing-induced crack formation during laser powder-bed additive manufacturing is studied. Twelve different alloys—some of existing (heritage) type but also other newly-designed ones—are considered. A strong inter-dependence of alloy composition and processability is demonstrated. Stereological procedures are developed to enable the two dominant defect types found—solidification cracks and solid-state ductility dip cracks—to be distinguished and quantified. Differential scanning calorimetry, creep stress relaxation tests at 1000 °C and measurements of tensile ductility at 800 °C are used to interpret the effects of alloy composition. A model for solid-state cracking is proposed, based on an incapacity to relax the thermal stress arising from constrained differential thermal contraction; its development is supported by experimental measurements using a constrained bar cooling test. A modified solidification cracking criterion is proposed based upon solidification range but including also a contribution from the stress relaxation effect. This work provides fundamental insights into the role of composition on the additive manufacturability of these materials.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
Actions
Access Document
- Files:
-
-
(Preview, Version of record, 4.6MB, Terms of use)
-
- Publisher copy:
- 10.1007/s11661-021-06568-z
Authors
- Publisher:
- Springer
- Journal:
- Metallurgical and Materials Transactions A More from this journal
- Volume:
- 53
- Pages:
- 962–983
- Publication date:
- 2022-01-08
- Acceptance date:
- 2021-11-30
- DOI:
- EISSN:
-
1543-1940
- ISSN:
-
1073-5623
- Language:
-
English
- Keywords:
- Pubs id:
-
1236120
- Local pid:
-
pubs:1236120
- Deposit date:
-
2022-02-18
Terms of use
- Copyright holder:
- Ghoussoub et al.
- Copyright date:
- 2022
- Rights statement:
- ©2022 The Author(s). Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
- Licence:
- CC Attribution (CC BY)
If you are the owner of this record, you can report an update to it here: Report update to this record