In situ CLSM observation of Austenite microstructural evolution during hot deformation
Why this work is in the frame
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Bibliographic record
Abstract
In-situ observations of microstructure evolution during the thermomechanical processing of low-carbon steel have been carried out using a high-temperature tensile testing system (HiTTS) integrated with a confocal laser scanning microscope (CLSM). Experiments were conducted within the temperature range between 800 to 1200 °C, and employing a strain rate of 0.001 s −1 to analyze the evolution of austenite microstructure at different temperatures and to identify the deformation and restoration mechanisms. The findings suggest that at temperatures below 900 °C, planar slip is the dominant deformation mechanism, and slip transfer is more favorable at twin boundaries than at grain boundaries. On the other hand, dynamic recrystallization (DRX) is identified as the primary restoration mechanism above 900 °C. The study identifies various nucleation sites for DRX grains, with triple junctions and grain boundaries serving as the nucleation sites at 900 °C. As the temperature increases to 1000 °C and above, new nucleation sites, such as inside annealing twin boundaries and free twin ends, are observed. The microstructure results suggest that the morphology of the twin boundary changes and loses its character during deformation. The role of annealing twin boundaries on DRX and bulging mechanisms associated with the various nucleation sites are discussed in great detail. Finally, the operational details, including temperature variations along the gauge length and thermal profile adjustments, including overshooting and undershooting and high-temperature surface reactions such as oxidation, decarburization, and evaporation, are meticulously examined.
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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) | 0.000 | 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 it