Nickel Based Alloy Casting Failure in Potash Production Mill
Bibliographic record
Abstract
ABSTRACT A nickel-based alloy knife gate valve exposed to hot potash brine failed in less than two years in service. Failure was realized when the valve was unable to stop the flow. Visual examination of the valve internal body parts revealed heavy scaling and corrosion damage, although the center body part and the two knife gates were intact. Corrosion scale samples were subjected to chemical analysis by X-ray diffraction (XRD) augmented by energy dispersive X-ray spectroscopy (EDS). The XRD technique was unable to identify approximately 85% of the components in the scale due to lack of crystallinity. The crystalline portion of the scale was found to contain a mixture of molybdenum, chromium, nickel and tungsten oxides, and trace amounts of tungsten carbide and nickel sulphate. EDS analysis revealed high concentrations of oxygen, molybdenum and tungsten. Metallographic examination of the corroded surface revealed preferential attack of the inter-dendritic secondary phases in the cast microstructure. The results of the examinations show, the higher carbon content in the cast alloy had consumed a portion of the corrosion resisting alloying elements by forming carbide precipitates. This resulted in the depletion of corrosion resisting alloying elements in localized areas. These depleted localized areas were therefore susceptible to corrosion attack upon exposure to corrosive process fluids.
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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".