Effect of alloy powder on microstructures and mechanical properties of the K640 brazed joints
Bibliographic record
Abstract
The cast cobalt-based high temperature alloy,named K640,was brazed by conventional brazing and wide-gap brazing respectively.The micpostructures of the joints were observed and analyzed by means of SEM and EDX.The results showed that obvious composition segregation occured in the capillary joint,and lots of compounds as well as low-melting eutectic phases accumulated in the central part of the joint.Whereas,the microstructure of the joint was remarkably improved with the addition of alloy powder,in particular,the amount of compounds and low-melting eutectics decreased sharply.This is favorable to the improvement of the joint strength.However,the formation of a few small holes in the brazing seam would unavoidablely weaken the joint.The average stress-rupture life of the conventional brazed joints was 19h48min,and fracture occurred at the brazing seam with some necking.On the other hand, the average stress-rupture life of the wide-gap brazed joints came up to 21 h 43 min,and in the case the fracture occurred at the base metal.
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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 | 0.001 |
| 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 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".