Bibliographic record
Abstract
Abstract Two commercially available tungsten carbide-based, Ni alloy binder PTAW overlays which had both previously exhibited excellent resistance to slurry erosion (in substantially non-corrosive conditions) and abrasion were assessed in a more corrosive wear slurry environment. One overlay consisted of a 50 vol.% mixture of crushed eutectic (WC/W2C), spherical eutectic and macrocrystalline WC particles in a NiBFeSi matrix, whilst the other contained 50 vol.% macrocrystalline WC in a NiCrBSi matrix. Initial microstructural examination of the mixed carbide/NiBSi overlay, confirmed that substantial dissolution/degradation of the spherical eutectic and crushed eutectic carbides had occurred as a consequence of interaction with its matrix alloy constituent at the high temperatures encountered during arc deposition. Conversely, the macrocrystalline WC-based overlay exhibited very limited carbide dissolution or degradation. The total erosion-corrosion (E-C) rate, as well as the separate components of erosion, corrosion and synergy, was established using a novel Slurry Pot Erosion Corrosion (SPEC) tester. The E-C rate for the macro WC/NiCrBSi overlay was approximately four times less than the E-C rate for the mixed carbide/NiBSi overlay, which performed comparatively poorly. The mixed carbide/NiBSi overlay displayed a very large synergistic value, which accounted for 90% of the total erosion-corrosion (E-C) rate, with the macro WC/NiCrBSi showing a synergy level accounting for 50% of the total E-C rate. To establish and compare the damage mechanisms affecting both overlays, a novel technique was implemented where specific regions were examined using a Scanning Electron Microscope (SEM) before and after SPEC testing. This procedure was applied to determine any preferential attack that was occurring and to elucidate the reasons for the significantly different E-C performance of the two products. The main reasons for the inferior performance of the mixed carbide/NiBSi overlay were found to be due to attack of the non-Cr bearing matrix and preferential removal of the W/Ni-rich boundary layer and eta- carbides, formed around the eutectic carbides during deposition.
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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) | 0.023 | 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".