Abstract
Hydrogen is being considered integral to the future energy landscape but there is limited mechanistic understanding and a lack of predictive models to describe the combined effects of alloy and gas composition, temperature, thermal cycling and water vapor contents on the oxidation behavior of high-temperature materials. Experimental evaluations were combined with coupled thermodynamic-kinetic modeling to investigate the oxidation behavior of five representative Ni-based superalloys in two water vapor contents (10%, 60% H2O) under thermal cycling (1-h, 100-h cyles) conditions at 800°C and 1000°C. The alloy with the highest Ti content demonstrated the poorest cyclic oxidation behavior while the alloy with highest Cr and Al contents was expected to continue to support protective formation of a compact Al2O3 scale. Accelerated degradation of the chromia-forming alloys was observed in the higher water vapor content but the impact on transient oxidation of the alumina-forming alloys needs further investigations.
| Original language | English |
|---|---|
| Pages (from-to) | 3988-3997 |
| Number of pages | 10 |
| Journal | JOM |
| Volume | 73 |
| Issue number | 12 |
| DOIs | |
| State | Published - Dec 2021 |
Funding
The authors sincerely thank G. Garner, T. Lowe and V. Cox for assistance with the experimental work and microstructural characterization at ORNL. This research was sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Combined Heat and Power Program. The authors sincerely thank M. Romedenne and C. Parker for providing valuable comments on the manuscript. The authors sincerely thank G. Garner, T. Lowe and V. Cox for assistance with the experimental work and microstructural characterization at ORNL. This research was sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Combined Heat and Power Program. The authors sincerely thank M. Romedenne and C. Parker for providing valuable comments on the manuscript. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).