Abstract
Chemical phase and microstructural investigations of alloy 718 solution-annealed and age-hardened were performed in this study. Focus was made in the effects of solution annealing temperature, aging temperature and holding time, and the amount of intermediate cold work on the alloy. The formation of secondary phases such as γ’-phase, γ”-phase, and δ-phase, grain sizes, and any deformations of the microstructure with respect to the processed conditions have been studied. Statistics such as size and number densities of these precipitates with respect to the processing conditions were evaluated and a discussion on optimum conditions in obtaining finer and higher density of γ’- and γ”-phase precipitates is also presented.
| Original language | English |
|---|---|
| Pages (from-to) | 195-202 |
| Number of pages | 8 |
| Journal | Materials Science and Engineering: A |
| Volume | 691 |
| DOIs | |
| State | Published - Apr 13 2017 |
Bibliographical note
Publisher Copyright:© 2017
Funding
This research was funded by Electric Power Research Institute (EPRI), Palo Alto, CA 94304, USA (EPRI Agreement number MA10001593) and supported by the Nuclear Engineering and Radiological Sciences Department, University of Michigan, Ann Arbor, MI 48109, USA. The authors of this manuscript sincerely thank the Clifford Davisson and Luis Mora at Oak Ridge National Laboratory for their invaluable support in sample preparations.
| Funders | Funder number |
|---|---|
| Nuclear Engineering and Radiological Sciences Department, University of Michigan | MI 48109 |
| Electric Power Research Institute | CA 94304, MA10001593 |
Keywords
- Alloy 718
- Delta phase
- Gamma phase
- Gamma-double prime phase
- Gamma-prime phase
- Precipitation hardening