Experimental-numerical Investigation of âº/ß-phase formation within thin electron beam melted Ti-6Al-4V.
Heliyon
; 10(4): e25971, 2024 Feb 29.
Article
in En
| MEDLINE
| ID: mdl-38375269
ABSTRACT
Electron beam melting is a powder bed fusion process capable of manufacturing thin structural features. However, as the thickness of these features approaches typical microstructure grain sizes, it becomes vital to understand how the manufacturing process contributes to local crystallographic texture and anisotropy in micromechanical response. Therefore, this article investigates Ti-6Al-4V âº/ß-phase formation within thin components using a variety of experimental and numerical approaches. Optical and scanning electron microscopy are used to determine through-thickness distributions of prior-ß width ([top, middle, bottom][81.2 ± 44.2, 76.02 ± 30.4, 75.6 ± 31.2] µm), âº-lath thickness ([top, middle, bottom][1.0 ± 1.3, 1.3 ± 1.2, 1.4 ± 1.8] µm; average), and âº/ß-phase fractions ([top, middle, bottom][0.87 ± 0.05, 0.82 ± 0.03, 0.88 ± 0.03]; average). Manufacturing process (i.e., "logfile") data is used within a layer-by-layer finite element "birth/death" model. This model is loosely coupled with the Kim-Kim-Suzuki phase field model and a CALPHAD thermodynamic database to predict âº-lath growth throughout the process. In general, good correlation is found between the experimental data and the predicted temperature history, âº-lath coarsening, and phase fraction. This indicates that these tools would be useful in predicting process-structure-properties-performance relationships for thin features.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Heliyon
Year:
2024
Document type:
Article
Affiliation country:
United States
Country of publication:
United kingdom