About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Corrosion of Advanced Materials: Theory and Practice
|
| Presentation Title |
Assessing the Performance of Additively Manufactured Alloy 718 After Heat Treatment Optimized for Oil and Gas Applications |
| Author(s) |
Mark R. Stoudt, Maureen E. Williams, Carelyn E. Campbell, James S. Zuback, Mark Yunovich |
| On-Site Speaker (Planned) |
Mark R. Stoudt |
| Abstract Scope |
The AM build process generates high residual stresses, and microstructural heterogeneities that promote variability in the properties. Since, most heat treatments are designed for wrought material, components often fail to meet the performance specifications for oil and gas applications. The solution-anneal protocol prescribed for Alloy 718 the American Petroleum Institute-6ACRA standard does not completely eliminate the solidification microstructure and the required properties cannot be reliably achieved. An ICME framework combining CALPHAD-based modeling and experimental validation was adopted to develop a heat treatment specifically for AM-processed Alloy 718. The question is whether AM processing affected the resistance to environmentally assisted cracking. To address this, AM samples were heat treated to meet the strength specifications for wrought API-grade material. The performance was evaluated using slow strain rate tensile tests under inert conditions and in an acidified environment with cathodic polarization. The heat treatment, test methods, and results will be presented and discussed. |