Abstract
The cyclic oxidation behavior of HK30Nb heat-resistant steel processed by laser powder bed fusion (LPBF) was compared to its cast counterpart during exposures in air and air + 10% H2O at 800 °C. The specific finer microstructure and lower Mn of the LPBF alloy resulted in lower oxidation rates in dry air and faster establishment of a continuous Cr2O3 scale in air + 10% H2O compared to coarse-grained cast HK30Nb with higher Mn. Differences in alloy mechanical strength and therefore their ability to accommodate high temperature and oxidation-induced stresses as well as differences in thermal expansion coefficients between the alloy and the formed oxides (Cr2O3 only for the LPBF and Cr2O3 and MnCr2O4 for the cast specimens) during temperature cycling were found to result in a greater extent of spallation for the LPBF than for the cast alloy in dry air at 800 °C.
| Original language | English |
|---|---|
| Pages (from-to) | 157-176 |
| Number of pages | 20 |
| Journal | High Temperature Corrosion of Materials |
| Volume | 100 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Oct 2023 |
Funding
The authors would like to thank M. Stephens, J. Wade, T. Lowe, V. Cox, C. O’Dell and E. Cakmak for their assistance with the experimental work. M. Ridley and P. Fernandez-Zelaia are kindly acknowledged for their detailed comments on the manuscript. This research was sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office, Propulsion Materials Program, and the EERE Advanced Manufacturing Office, Combined Heat and Power Program under contract DE-AC05-00OR22725 with UT-Battelle LLC. The work was performed in partiality at the Oak Ridge National Laboratory’s Manufacturing Demonstration Facility, an Office of Energy Efficiency and Renewable Energy user facility. The authors declare no conflict of interest. Notice: 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). The authors would like to thank M. Stephens, J. Wade, T. Lowe, V. Cox, C. O’Dell and E. Cakmak for their assistance with the experimental work. M. Ridley and P. Fernandez-Zelaia are kindly acknowledged for their detailed comments on the manuscript. This research was sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office, Propulsion Materials Program, and the EERE Advanced Manufacturing Office, Combined Heat and Power Program under contract DE-AC05-00OR22725 with UT-Battelle LLC. The work was performed in partiality at the Oak Ridge National Laboratory’s Manufacturing Demonstration Facility, an Office of Energy Efficiency and Renewable Energy user facility. The authors declare no conflict of interest. Notice: 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 ).
Keywords
- Cyclic oxidation
- Heat-resistant steel
- Laser powder bed fusion
- Water vapor
