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Maximilian Fichtl, M.Sc.

Centre for Applied Research

TC Parsberg/Lupburg

Academic Staff

1.07

09492/8384-109

publications

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Zeitschriftenartikel

Korbinian Schröcker
Maximilian Fichtl
B. Bax
D. Scheider
M. Reisacher
Andrey Prihodovsky

Mechanical properties of the LMD-processed material Ferro55 in as-built and heat-treated conditions

In: Procedia CIRP vol. 111 pg. 228-232.

(2022)

DOI: 10.1016/j.procir.2022.08.055

Abstract anzeigen

The die and mould industry shows a growing interest in the DED family of the additive manufacturing processes. DED processes like LMD are used in manufacturing of moulds with improved functionality and in repair processes. The metallic materials used for LMD processing of the mould components should exhibit good weldability and possess high mechanical properties such as hardness and strength. The properties of LMD samples made out of the Ferro55 material, specially developed for the deposition processes, were investigated intensively. The mechanical properties were measured in as-built, hardened, and tempered samples. The hardness distribution and the variation of the chemical compositions were examined as well. Ferro55 material shows a very high strength and hardness already in as-built condition. These properties exceed the properties of comparable hot forming tool steels like X37CrMoV5-1 (1.2343). Further improvements are achieved through the subsequent heat treatment.

TC Parsberg/Lupburg
NACHHALTIG

Vortrag

Maximilian Fichtl

Untersuchung der Defektbildung beim LMD-Verfahren

In: Deggendorfer Wissenschaftliches Kolloquium

Technische Hochschule Deggendorf Deggendorf

17.11.2022 (2022)

TC Parsberg/Lupburg
DIGITAL

Zeitschriftenartikel

Anton Schmailzl
Johannes Käsbauer
J. Martan
P. Honnerová
F. Schäfer
Maximilian Fichtl
T. Lehrer
L. Prušáková
J. Tesař
J. Skála
M. Honner

Measurement of core temperature through semi-transparent polyamide 6 using scanner-integrated pyrometer in laser welding

In: International Journal of Heat and Mass Transfer vol. 146 pg. 118814.

(2020)

DOI: 10.1016/j.ijheatmasstransfer.2019.118814

Abstract anzeigen

Predicting the core temperature during welding is an ambitious aim in many research works. In this work, a 3D-scanner with integrated pyrometer is characterized and used to measure the temperature during quasi-simultaneous laser transmission welding of polyamide 6. However, due to welding in an overlap configuration, the heat radiation emitted from the joining zone of a laser transmission weld has to pass through the upper polymer, which is itself a semi-transparent emitter. Therefore, the spectral filtering of the heat radiation in the upper polymer is taken into account by calibrating the pyrometer for the measurement task. Thermal process simulations are performed to compare the temperature field with the measured temperature signal. The absorption coefficients of the polymers are measured, in order to get precise results from the computation. The temperature signals during welding are in good agreement with the computed mean temperature inside the detection spot, located in the joining area. This is also true for varying laser power, laser beam diameter and the carbon black content in the lower polymer. Both, the computed mean temperature and the temperature signal are representing the core temperature. In order to evaluate the spatial sensitivity of the measurement system, the emitted heat radiation from both polymers is calculated on basis of the computed temperature field. Hereby it is found, that more than 90 percent of the detected heat radiation comes from the joining area, which is a crucial information for contact-free temperature measurement tasks on semi-transparent polymers.

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