Microstructural evolution and mechanical behavior of resistance spot welded FeCrNiSiB advanced high-strength steel
Bibliographic record
Abstract
This study examines the microstructural evolution and mechanical performance of resistance spot welded joints in a newly developed FeCrNiSiB advanced high-strength steel (AHSS). The effects of key welding parameters—current (4–7 kA), weld time (9–21 cycles), and electrode force (2–4 kN)—on nugget formation and failure behavior were systematically investigated through 24 welding trials. Lobe curves were constructed at three force levels to define optimal processing windows, showing narrower weldability ranges at higher forces. Microstructural analysis revealed a dendritic austenitic matrix interspersed with eutectic boride phases (M 2 B) in the fusion zone (FZ), while the partially melted zone (PMZ) exhibited partially liquefied grains with similar eutectics. Hardness in the FZ reached 1.5 times that of the base metal due to boride enrichment. Tensile-shear tests indicated a failure mode transition—from interfacial (IF) to partial interfacial (PIF), and eventually to partial thickness–partial pullout (PT-PP)—as nugget size increased. For welds with nugget diameters above 4 mm, joints exceeded the minimum tensile-shear strength requirement by approximately 14%. These findings demonstrate the influence of welding parameters on microstructure, hardness, and localized mechanical response in this novel boron-alloyed AHSS.
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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 | 0.001 | 0.001 |
| 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".