Failure mechanisms in thermomechanical fatigue of DS superalloy Rene 80
Bibliographic record
Abstract
Directionally solidified Rene 80 superalloy was tested in thermomechanical fatigue (TMF) over the temperature range 500–900°C and plastic strain range from 0·2 to 0·8% using a DSI Gleeble thermal simulator. Thermomechanical testing was carried out on the parent material in the conventional solution treated and aged condition, as well as gas tungsten arc welded with an IN-738 filler, followed by solution treatment and aging. Comparison of the base TMF unwelded alloy with that of the welded and heat treated alloy showed that varying crack initiation mechanisms, notably oxidation either by stress assisted grain boundary oxidation, or associated with grain boundary MC carbides fatigue crack propagation along grain boundaries and creep deformation were operating, leading to different weakest link failure initiation points.On a évalué le superalliage orienté, René 80, par fatigue thermomécanique (TMF) dans la gamme de température de 500 à 900°C et dans une gamme de déformation plastique de 0·2 à 0·8% en utilisant un simulateur thermique Gleeble de DSI. On a effectué l’essai thermomécanique du matériau de base sous condition conventionnelle de mise en solution et vieillissement, ainsi que du matériau soudé au tig avec un métal d’apport IN–738, suivi par mise en solution et vieillissement. La comparaison de l’alliage de base TMF sans soudure à celui de l’alliage soudé et traité thermiquement a montré que des mécanismes variés d’initiation de fissure entraient en jeu. On note l’oxydation, soit oxydation du joint de grain, assistée par la contrainte, ou associée à la propagation de fissure par fatigue de carbures MC de joint de grain le long des joints de grain et déformation par fluage, conduisant à différents points d’initiation de défaillance du plus faible maillon.
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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".