Comparison of gaseous hydrogen effects in 1200 MPa high strength martensitic and pearlitic steels
Bibliographic record
Abstract
This study compares gaseous hydrogen effects in a high strength martensitic and pearlitic steel (ultimate tensile strength of 1200–1300 MPa). When tensile tested in 10 MPa gaseous hydrogen at room temperature, the relative reduction of area (RRA) is 14 % for the martensitic steel while the pearlitic steel shows much improved behaviour with an RRA of 75 %. The microstructures of both steels are characterized in detail pre- and post-mortem. Fractography reveals that hydrogen assisted fracture occurs predominantly along prior austenite grain boundaries for the martensitic steel while tearing topography surface characteristics are observed for the pearlitic steel. Thermal desorption spectroscopy measurements show similar total hydrogen contents of about 2 wppm in both microstructures. In the martensitic microstructure, hydrogen is weakly trapped, whereas in the pearlitic microstructure, about 30 % of the hydrogen is strongly trapped. This seems to be one important reason for the higher RRA of the pearlitic microstructure in 10 MPa gaseous hydrogen.
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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 | 0.001 | 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".