Role of Prior Cyclic Loading in the Initiation of Stress-Corrosion Cracks on Pipeline Steels Exposed to Near-Neutral pH Environment
Bibliographic record
Abstract
X-52 and X-80 pipeline steels have been used to study the effect of cyclic loading prior to corrosion exposure upon the initiation of stress-corrosion cracks in a near-neutral pH environment. To simulate realistic loading conditions, a cyclic loading scheme was constructed based on pressure fluctuation data collected on operating pipeline systems. It has been observed that cyclic loading either prior to corrosion exposure under static stress or during corrosion exposure enhances pitting corrosion and micro-cracking on the steel surface. These pits are seen to be aligned along scratches on the steel surface and to have coalesced to form micro-cracks at some locations. Some micro-cracks appeared not to have developed from pits, but were instead observed in a direction approximately 45 degree to stress axis. They are believed to have developed at locations where localized deformation such as persistent slip bands has occurred due to cyclic loading. In contrast to cyclic loading, no pits or micro-cracks were seen on the specimen that was subjected to static loading only. The pits and micro-cracks were only observed when the specimens were immersed under a cathodic potential of −790 mV SCE. At the open circuit potential only uniform corrosion occurred on the specimens whether they were cyclically or statically stressed.
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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) | 0.003 | 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".