Creep of MARBN-type 9Cr martensitic steel in gaseous CO₂ environment

Journal Article · 31 August 2021 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI: https://doi.org/10.1016/j.msea.2021.141996 · OSTI ID:1869462

Rozman, K. A. ^[1]; Oleksak, R. P. ^[1]; Doğan, Ö. N. ^[2]; Detrois, M. ^[2]; Jablonski, P. D. ^[2]; Hawk, J. A. ^[2]

---

1. National Energy Technology Lab. (NETL), Albany, OR (United States); National Energy Technology Lab. (NETL), Albany, OR (United States).Support Contractor
2. National Energy Technology Lab. (NETL), Albany, OR (United States)

Here, with an interest in moving from steam to supercritical CO₂ as the working fluid in advanced energy systems, it is important to study the mechanical response of structural alloys to CO₂-containing environments. MARBN-type 9Cr martensitic steel was originally developed for application in boilers for supercritical and ultra-supercritical power plants where the steam temperature reaches 650 °C. In this research, a MARBN-type 9Cr martensitic steel designed and manufactured at NETL was creep tested in a gaseous CO₂ environment (i.e., 0.1 MPa at 650 °C), and the results are directly compared to creep tests conducted in air. It was found that environmentally-assisted cracking facilitated by carbide formation beneath the growing oxide accelerated failure in gaseous CO₂. This work indicates that creep-oxidation interactions in advanced martensitic steels represent an important consideration for materials selection in supercritical CO₂ power cycles. Furthermore, this work confirms that more oxidation-resistant alloys will be required for the highest temperature portions of these systems.

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
• Sponsoring Organization: USDOE; USDOE Office of Fossil Energy (FE)
• Grant/Contract Number: 89243318CFE000003
• OSTI ID: 1869462
• Journal Information: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: None Vol. 826; ISSN 0921-5093
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English