EFFECT OF WATER OR STEAM PRESSURE ON THE OXIDATION BEHAVIOUR OF ALLOY 625 AND A286 AT 625 °C
Bibliographic record
Abstract
The Canadian supercritical water-cooled reactor (SCWR) is currently being designed by Canadian Nuclear Laboratories. It presents challenges to many scientists and engineers owing to the harsh environment in which the reactor must operate and the lack of knowledge in material’s performance under high temperature, pressure, and irradiation. In this study, 2 superalloys, A286 and Alloy 625, were tested in supercritical, high-pressure, and low-pressure steam at 625 °C for 1000 h; each represents a pressure of 29 MPa (SCW), 8 MPa (high-pressure steam), and finally 0.1 MPa (low-pressure steam). Results from this study show a higher oxidation rate, in terms of weight gain, for A286 under all conditions primarily due to its low Cr content. Alloy 625, on the other hand, exhibits much more oxidation resistance under all conditions due to the formation of protective Cr-containing surface oxide(s). Weight changes of A286 and Alloy 625 in supercritical water and low pressure steam are comparable, while high pressure steam exposure leads to considerable weight gain of A286 samples and weight loss and pitting on Alloy 625.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".