Thermal cycling on microstructure and mechanical properties of laser powder bed fusion manufactured IN738LC alloy
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Bibliographic record
Abstract
Abstract This study investigated the impact of thermal cycling effects on the microstructure and mechanical properties of IN738LC alloy manufactured by laser powder bed fusion, considering different volumetric energy densities (VEDs) and interlayer times (ILTs) as part of the experimental parameters. The results show that low VED and long ILT samples displayed superior quality, with an average grain size of 10.97 μm and relatively low strain accumulation level. In contrast, samples with high VED and long ILT exhibit increased cracking and porosity, the average grain size is 14.63 μm and present higher strain accumulation degree. The nano‐primary MC phase within the alloy transformed into a spherical secondary MC phase inside the grain and a polygonal secondary MC phase on the grain boundary. In the low VED and long ILT, the mean equivalent diameter (MED) of MC carbide within the grain and on the grain boundary was 63 and 140 nm, respectively, the tensile strength was 1072 ± 21 MPa. By contrast, for the high VED and long ILT, the MED of MC carbide in the grain and on the grain boundary were 47 and 105 nm, respectively, and the tensile strength was 794 ± 31 MPa. The tensile strength of high VED and long ILT decreased by 26% compared with low VED and long ILT.
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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) | 0.000 | 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 it