Oxidation Resistance of Additively Manufactured Inconel 718 for Gas Turbine Applications
Bibliographic record
Abstract
This research investigates the oxidation behaviour of an additively manufactured (AM) superalloy Inconel 718 and compares its oxidation performance to that of wrought Inconel 718. A plasma arc additive manufacturing process was developed and utilized to manufacture the AM specimens. All specimens were subjected to exposures at 800C and 900C. The oxidized specimens were analysed using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). Both surface oxide and cross-section microstructure were examined, in addition to microstructure changes in the substrate. The results showed that the two alloys had similar weight changes over the periods of 50-400 hours at both temperatures. However, the microstructure changes on the surface and in the substrate were different. The thickness of the chromia oxide scale formed on AM Inconel 718 was consistently thinner than that on the wrought specimens. There was also more internal oxidation on the AM specimens, particularly after longer exposure at high temperature. In addition, the formation of a subscale Nb-rich layer was observed between outer chromia and substrate on all specimens, except on the AM specimens exposed to 800C for 100 hours, this layer contributed to the integrity of the chromia oxide layer.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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) | 0.001 | 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 teacher head, 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".