Effect of initial base metal microstructure on weld hot cracking susceptibilities of Alloy 718 forgings
Bibliographic record
Abstract
The effect of the base metal (BM) microstructure on the hot cracking susceptibilities of Alloy 718 during welding was investigated. A forged ring of Alloy 718 was subjected to a series of heat treatments to produce distinct initial BM microstructures with variations in grain size and precipitate distribution. The cracking susceptibilities in the fusion zone (FZ) and heat-affected zone (HAZ) were quantitatively assessed using Varestraint tests. The results revealed that the FZ cracking susceptibility increased with increasing BM grain size, owing to epitaxial grain growth during solidification that promoted the formation of coarser grains in the FZ. In the HAZ, cracking susceptibility was strongly influenced by Nb-rich precipitates formed during solution treatment, such as Laves and grain boundary δ phases, which promoted constitutional liquation and segregation-induced liquation along grain boundaries, respectively.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 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".