Effect of microwave hybrid heat treatment on the microstructure and hardness of 3D printed Inconel 718 superalloy
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Bibliographic record
Abstract
This study explores the potential of a microwave hybrid heating (MHH) technique as an efficient post-heat treatment route for an Inconel 718 (IN718) superalloy processed by laser powder bed fusion (LPBF). The LPBF-IN718 alloy is post-heat-treated using an industrial microwave (MW) oven and a conventional heat treatment route to eliminate the segregates and Laves phase. The MW treatment generates a relatively higher back diffusion rate of the segregated elements releasing more Nb into the γ-matrix compared to the conventional treatment. This results in lower fraction of intergranular δ-phase in the MW-processed microstructure (≈ 0.2%) relative to conventionally processed microstructure (≈ 0.81%). However, more precipitation of the MC-type carbides is observed in the matrix after the MW-treatment, indicating the supersaturation of the γ-matrix in the back-diffused elements. Both the MW and conventional treatments affect the hardness similarly owing to the combined effect of the precipitation hardening and the substructure strengthening. Compared to conventional heating, the MW processing time, to heat the sample to the set temperature, is reduced by a factor of 2, and the consumed energy is decreased by 80%. As a result, an MW-treatment can be considered as a cost-effective alternative to a conventional post-heat treatment for LPBF-IN718 components.
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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