Linear Friction Welding of Allvac® 718Plus® Superalloy
Bibliographic record
Abstract
®Linear Friction Welding (LFW) process was used to join Allvac 718 Plus (718 Plus) superalloy and produce a sound weld that was free of cracks both after welding and post weld heat treatment (PWHT).However, contrary to that reported in literature, it was found that the friction welding was not a completely solid state joining process as a significant grain boundary liquation was observed in the thermo-mechanically affected zone (TMAZ) of the welded material.The intergranular liquation was due to constitutional liquation of second phase particles like MC type carbides, Ti rich carbonitride particles and δ phase precipitates.Liquation resulted in formation of Laves phase particles during welding and a non-uniform distribution of the main strengthening phase of the alloy, γ′ precipitates, during PWHT.Despite considerable liquation, there was no intergranular microfissuring which might be related to the nature of imposed stress during the LFW process.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".