Control of Alpha Case on Investment Cast Ti 6Al‐4V Using An Industrial Shelling System
Why this work is in the frame
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Bibliographic record
Abstract
Molten titanium has a strong reaction with most of the refractories used for mold building in investment casting. Calcia partially stabilized zirconia (PSZ) used as a facecoat material has a reduced reaction with molten titanium and is still offered at an affordable cost. However poor process control can greatly impair the formation of a thin alpha case, an essential condition to limit the amount of subsequent chemical milling. The effect of the prime stuccos, the viscosity of the prime slurry, and the shell mold preheating temperature on alpha case thickness have been evaluated for different casting wall thicknesses. Alpha case depth have been determined by metallographic techniques and microhardness measurements on different casting cross sections. Mnimum achievable alpha case thickness has been determined with a calcia partially stabilized zirconia (PSZ) face coat.
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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) | 0.001 | 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) | 0.005 | 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 it