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Updated: Jul 25, 2025
03:49
Quantitative Analysis of Vacuum Induction Melting by Laser-induced Breakdown Spectroscopy
Published on: June 10, 2019
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Time-resolved absorption spectroscopy in electron beam melting with blue vertical-cavity surface-emitting lasers
Optics Express
|June 29, 2023
Summary
Researchers used tunable diode-laser absorption spectroscopy (TDLAS) to study vanadium vapor dynamics during electron beam melting (EBM) of Ti-6Al-4V. This novel technique provides time-resolved thermometry for additive manufacturing processes.
Area of Science:
- Additive Manufacturing
- Materials Science
- Spectroscopy
Background:
- Electron Beam Melting (EBM) is a key additive manufacturing technology.
- Understanding metal vapor dynamics in EBM is crucial for process control.
- Limited contactless, time-resolved sensing methods exist for EBM environments.
Purpose of the Study:
- To investigate the dynamics of partially evaporated metal in the EBM melt pool.
- To apply tunable diode-laser absorption spectroscopy (TDLAS) for time-resolved measurements.
- To characterize vanadium vapor behavior during the EBM of Ti-6Al-4V alloy.
Main Methods:
- Utilized tunable diode-laser absorption spectroscopy (TDLAS).
- Employed a blue Gallium Nitride (GaN) vertical cavity surface emitting laser (VCSEL) for spectroscopy.
- Performed measurements at a 20 kHz sampling rate.
Main Results:
- Observed a roughly symmetrical metal vapor plume.
- Determined a uniform temperature distribution within the plume.
- Achieved time-resolved thermometry of a minor alloying element (vanadium).
Conclusions:
- TDLAS is effective for in-situ monitoring of EBM processes.
- The study demonstrates the first use of a blue GaN VCSEL for spectroscopy in EBM.
- This work establishes TDLAS for time-resolved thermometry of alloying elements in EBM.
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