Influence of Tantalum and Cobalt on the Weldability of New High Gamma Prime Nickel Based Superalloys for Repair and 3D AM of Turbine Engine Components
Bibliographic record
Abstract
Abstract The propensity of high gamma prime Ni-based superalloys to weld cracking is examined with emphasis on the influence of Ta and Co on weldability. This study focuses on the behavior of LW4280 and LW4280W superalloys containing 16 wt.% Co and 32 wt.% Co respectively. The weldability of experimental compositions of LW4280 with Ta ranging between 0.6 and 6.5 wt.% were also studied. LW4280W alloy, with significantly higher Co fraction, showed a reduced propensity to liquation and stress-strain cracking, improving weldability. However, tensile strength of welds above 982°C (1800°F) was reduced relative to LW4280. The optimal level of Ta in LW4280 was found to be in the middle of the range examined, allowing sound laser DED and GTAW welds to be produced at ambient temperature. Higher or lower levels of Ta resulted in weld cracking produced by GTAW-MA. Possible mechanisms by which Ta and Co levels impact weldability are discussed.
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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) | 0.000 | 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".