| About this Abstract |
| Meeting |
10th International Symposium on Superalloy 718 and Derivatives (2023)
|
| Symposium
|
Superalloy 718 and Derivatives
|
| Presentation Title |
Microstructure Evolution During Post-heat Treatment of Haynes 282 Alloy Processed by Wire-arc Additive Manufacturing |
| Author(s) |
Luis Ladinos Pizano, Soumya Sridar, Chantal Sudbrack, Wei Xiong |
| On-Site Speaker (Planned) |
Luis Ladinos Pizano |
| Abstract Scope |
In order to perform microstructure engineering for improved mechanical properties, post-heat treatment optimization is imperative for additive manufacturing of advanced superalloys. In this work, the effect of solution heat treatment on the microstructural heterogeneity and γ’ precipitation for Haynes 282 fabricated using wire-arc additive manufacturing (WAAM) has been investigated. The results suggest that the standard solution heat treatment carried out at 1150°C for 2 hours is insufficient to remove the heterogeneities in the grain structure formed during WAAM. However, solution heat treatment at 1250°C for 2 hours promoted the dissolution of secondary precipitates and recrystallized the grain structure without causing excessive coarsening. In addition, solution heat treatment temperature affects the growth kinetics of γ’ precipitates. By increasing the solution treatment temperature, γ’ grows faster, achieving the peak hardness in a shorter aging time. Moreover, increasing the solution treatment temperature favors the development of a bimodal distribution of γ’ precipitates during aging. Tensile tests are performed for samples extracted from build (XZ) and transverse (YZ) planes to evaluate the effectiveness of the solution treatment in removing the microstructural heterogeneity. This work demonstrates the need for an effective post-heat treatment to eliminate the heterogeneities that form during the WAAM process and alter the γ’ precipitation and improve the mechanical properties of Haynes 282. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |