Real-Time Control of Direct Laser Deposition Process of Inconel 718 Using Laser Emission Spectroscopy

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Abstract

Using atomic emission spectroscopy, the gas-plasma plume generated during laser selective melting of various alloys was investigated. It was demonstrated that the type of protective gas used affects the spectral characteristics. The use of helium as a process gas compared to argon reduces overall luminescence and the contributions of individual elements to the spectrum, indicating lower losses of these elements through evaporation under laser radiation exposure.

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About the authors

Alexander A. Golyshev

Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences

Email: alexgol@itam.nsc.ru
Russian Federation, 4/1, Institutskaya St., Novosibirsk, 630090

Nikolay A. Maslov

Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: nmaslov@itam.nsc.ru
Russian Federation, 4/1, Institutskaya St., Novosibirsk, 630090

Sergey A. Konstantinov

Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences

Email: azkin@mail.ru
Russian Federation, 4/1, Institutskaya St., Novosibirsk, 630090

Alexander G. Malikov

Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences

Email: smalik707@yandex.ru
Russian Federation, 4/1, Institutskaya St., Novosibirsk, 630090

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Supplementary files

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2. Fig. 1. Schematics of the gas-laser torch and the conducted experiment.

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3. Fig. 2. Spectra measured during laser exposure of stainless steel substrate samples using helium or argon as protective process gas.

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4. Fig. 3. Spectra averaged over 5 measurements for different laser irradiation powers and types of shielding gas (a - argon; b - helium).

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5. Fig. 4. Example of spectra representation as a sum (a - original spectrum; b - its continuous part; c - its linear part).

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6. Fig. 5. Intensity of chromium lines for different laser irradiation powers and types of shielding gas (a - argon; b - helium).

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7. Fig. 6. Analysis of MHC spectra: a - GC; b - non-convex approximation of the thermal spectrum using GC; c - comparison of the found components (dashed line) with the theoretical dependence (solid line); d - full set of components.

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8. Fig. 7. Component contributions to the continuum part of the spectrum using argon (a - 1780 K component; b - 2730 K component; c - molecular component) and helium (d - 1780 K component; e - 2730 K component; f - molecular component).

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