|About this Abstract
||MS&T23: Materials Science & Technology
||High Temperature Corrosion and Degradation of Structural Materials
||Comparison and Mechanism of High-temperature Oxidation Behavior of Additively Manufactured Haynes 282 to Wrought Haynes 282 in Direct-fired Supercritical CO<sub>2</sub> Power Cycle Environments
||Casey Carney, Nicholas Lamprinakos, Richard P. Oleksak, Omer N. Dogan, Anthony D. Rollett
|On-Site Speaker (Planned)
Materials selection is a key concern for corrosion resistance in elevated temperature and pressure direct-fired supercritical CO<sub>2</sub> (sCO<sub>2</sub>) power cycles. Additive manufacturing (AM) could be used to construct compact heat exchangers with complex geometry. Haynes 282 AM coupons were exposed to direct-fired sCO<sub>2</sub> conditions (95CO<sub>2</sub> – 4H<sub>2</sub>O – 1O<sub>2</sub>, 20 MPa) at both atmospheric pressure (T=850 °C) and supercritical pressure of 20 MPa (T=750 °C) for more than 1500 hours. The oxidation behavior is contrasted with the oxidation of wrought H282, so that the feasibility of the use of AM production methods for direct-fired sCO<sub>2</sub> power cycles can be assessed. Oxidation protection slightly increased with AM samples. Additionally, two potentially significant differences were observed: (a) sub-surface carbides were present in AM samples but not in the wrought samples and (b) the degree of chromia volatilization appeared to be suppressed in AM samples. Potential mechanisms for this behavior will be examined.