Journal article 955 views 255 downloads
The effects of energy density and heat treatment on the microstructure and mechanical properties of laser additive manufactured Haynes 282
,
Robert Lancaster
Materials & Design, Volume: 205, Start page: 109725
Swansea University Authors:
Jonathan Jones, Nick Barnard, Mark Whittaker , Robert Lancaster
-
PDF | Version of Record
©2021 The Author(s). This is an open access article under the CC BY license
Download (6.76MB)
DOI (Published version): 10.1016/j.matdes.2021.109725
Abstract
The nickel-based superalloy Haynes 282 is a promising candidate material among the existing batch of aerospace alloys for manufacture via laser powder bed fusion (LPBF). LPBF Haynes 282 has a strong preference for epitaxial grain growth in the (0 0 1) orientation, promoting inhomogeneous grain morph...
| Published in: | Materials & Design |
|---|---|
| ISSN: | 0264-1275 |
| Published: |
Elsevier BV
2021
|
| Online Access: |
Check full text
|
| URI: | https://cronfa.swan.ac.uk/Record/cronfa56697 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Abstract: |
The nickel-based superalloy Haynes 282 is a promising candidate material among the existing batch of aerospace alloys for manufacture via laser powder bed fusion (LPBF). LPBF Haynes 282 has a strong preference for epitaxial grain growth in the (0 0 1) orientation, promoting inhomogeneous grain morphologies and anisotropic mechanical behaviour. In this paper, LPBF Haynes 282 specimens have been extracted from perpendicular and parallel orientations in respect to the primary vertical build direction and studied in their original as-built form and when exposed to a solution and age heat treatment. The effect of alternative energy densities is also considered in the different conditions. Results show that the numerous processing variables discussed in this research have a direct influence on the morphology of the final grain structure. Although a strongly anisotropic microstructure was present in the as-built material in both respective orientations, this behaviour was eradicated following the solution and aging heat treatment through recrystallisation, and the alleviation of local texture and misorientation to help produce a more uniform equiaxed grain morphology. The subsequent mechanical behaviour has been assessed through hardness, tensile and creep stress rupture testing, and results have corroborated the microstructural findings to confirm a more isotropic material was successfully achieved. |
|---|---|
| Keywords: |
Nickel base superalloys, Laser powder bed fusion, Energy density, Microstructure, Mechanical properties |
| College: |
Faculty of Science and Engineering |
| Start Page: |
109725 |