HAZ Microfissuring in EB Welded Allvac 718 Plus Alloy
Bibliographic record
Abstract
Weldability of two versions of newly developed 718 Plus alloy, HC49 and HC20 was studied and compared with that of Inconel 718. 5.0" x 0.5" x 0.5" thick plates were heat treated at 950 and 1050C, water-quenched then EB welded. Microstructures of the base metal and welds were examined by optical and analytical electron microscopy. Intergranular microcracks were observed in HAZ in all the three alloys, and their susceptibility to cracking was established by measuring total and maximum crack lengths. It was observed that HC49, with higher B and P, suffered most cracking and Inconel 718 the least. HAZ cracking was observed to be associated with resolidified liquated phase suggesting it to be liquation cracking. The EDS analysis suggested that the grain boundary liquation was due to the constitutional liquation of NbC and due to the GB segregation of B during the pre-weld heat treatment. The increased cracking in 718 Plus as compared to Inconel 718 was attributed to the softer matrix of Inconel 718, which could withstand the welding stresses better. More severe cracking in higher B version of 718 Plus than in the lower B 718 Plus could be due to the increased segregation of B on its grain boundaries.
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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) | 0.001 | 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".