Abstract
To explore potential application of Ni-based alloys for power generation at the higher temperatures and pressures needed to achieve high thermal to electrical-energy conversion efficiency, an extensive creep-rupture dataset covering up to 875 °C and almost 70,000 hours for Inconel 740/740H was analyzed using Larson–Miller parameter and Wilshire approaches. The results were used to assess the relative effectiveness of the two analytical methods, both in describing the experimental data and, because of the breadth of the dataset, using analyses of its shorter-time data to make creep lifetime predictions for much more extended times, which were then directly compared to the measured rupture times. The respective methods were also used to predict creep-limited lifetimes relevant to power production (that is, 100,000 hours or greater). Despite the complexity of the precipitation-strengthened Inconel 740/740H alloy and the generalized parametric approach of these methodologies, the predictions based on such were reasonably accurate when the entire dataset was analyzed. However, when the analysis was confined to only data for conditions yielding creep-rupture times < 5000 hours (about 65 pct of the entire dataset), the Wilshire correlation yielded better prediction for longer time lifetimes due to the inherent instability of the specific Larson–Miller formalism used in this analysis when extrapolated significantly outside its analysis range.
| Original language | English |
|---|---|
| Pages (from-to) | 2601-2612 |
| Number of pages | 12 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 52 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2021 |
Funding
This work was sponsored by the U.S. DOE, Office of Fossil Energy, High Performance Materials, under contract DE-AC05-00OR22725 with Oak Ridge National Laboratory (ORNL) managed by UT Battelle, LLC. Creep data were generated with funding from the DOE Office of Fossil Energy, Crosscutting Technologies program in collaboration with the DOE/Ohio Economic Development Corporation project on A-USC Materials. We are grateful to M. Fasouletos of the National Energy Technology Laboratory for the programmatic support. We acknowledge the technical initiative, support, and advice of J.P. Shingledecker, who designed the test matrix and procedures for the Inconel 740/740H creep studies, oversaw much of the experimental work while at ORNL and then, at the Electric Power Research Institute, served as technical manager of the A-USC materials program. The authors would like to express their appreciation for the technical assistance of Jeremy Moser and C. Shane Hawkins (ORNL) and the ORNL technical review from Yuki Yamamoto and Sebastien Dryepondt. This work was sponsored by the U.S. DOE, Office of Fossil Energy, High Performance Materials, under contract DE-AC05-00OR22725 with Oak Ridge National Laboratory (ORNL) managed by UT Battelle, LLC. Creep data were generated with funding from the DOE Office of Fossil Energy, Crosscutting Technologies program in collaboration with the DOE/Ohio Economic Development Corporation project on A-USC Materials. We are grateful to M. Fasouletos of the National Energy Technology Laboratory for the programmatic support. We acknowledge the technical initiative, support, and advice of J.P. Shingledecker, who designed the test matrix and procedures for the Inconel 740/740H creep studies, oversaw much of the experimental work while at ORNL and then, at the Electric Power Research Institute, served as technical manager of the A-USC materials program. The authors would like to express their appreciation for the technical assistance of Jeremy Moser and C. Shane Hawkins (ORNL) and the ORNL technical review from Yuki Yamamoto and Sebastien Dryepondt. This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed therein do not necessarily state or reflect those of the United States Government or any agency thereof.