About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
High Temperature Oxidation of Metals and Ceramics
|
Presentation Title |
High Temperature Oxidation Behavior of Fe- and Ni-Based Alloys Fabricated by Additive Manufacturing |
Author(s) |
Sebastien Dryepondt, Marie Romedenne, Rishi Pillai, Kinga A. Unocic, Bruce A. Pint |
On-Site Speaker (Planned) |
Sebastien Dryepondt |
Abstract Scope |
Additive manufacturing (AM) offers the unique opportunity of fabricating complex components such as high temperature heat exchangers or cooled turbine blades. Laser powder bed fusion or electron beam melting result in rapid cooling rates and thus specific microstructures that impact the alloy properties, including the alloy high temperature oxidation resistance. Elongated grains and cellular structures are good instances of microstructural features that can affect the oxidation behavior of Ni and Fe-based alloys. In addition, AM alloy chemistries often differ from the chemistries of wrought or cast counterparts, leading to significant differences in the oxide scales grown at 700-800°C in air or humid atmospheres. For example, variations in Si and/or Mn concentrations impact the oxidation resistance of Ni-based Hastelloy X or Fe-based HK30Nb. Finally, surface treatments might not be possible for components with internal features and the rougher AM surface finish needs to be accounted for when analyzing oxidation rates. |