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Article Dans Une Revue Review of Scientific Instruments Année : 2020

A high power laser facility to conduct annealing tests at high temperature

Résumé

The knowledge of materials properties and their behavior at high temperatures is of crucial importance in many fields. For instance annealing phenomena occuring during the thermomechanical processing of materials, such as recrystallization, have long been recognized as being both of scientific interest and technological importance. Different methods are currently used to study annealing phenomena and submit metals to heat loads. In this work, we present the design and the development of a laser-based facility for annealing tests. This experimental setup enables studies at the laboratory scale with great flexibility to submit samples to various spatial and temporal heating profiles. Due to the possibility to have optical access to the sample, laser heating can be combined to several non-contact diagnostics such as infrared imaging to control and analyse the temperature gradients. As case study, we present a set of experiments performed to study the recrystallization kinetics of tungsten. We demonstrate that samples can be heated linearly with heating rate up to ∼2000 K/s, at temperatures above 2000K, for seconds or hours, with typical errors in the temperature measurement of around 1% that depend mainly on the determination of sample emissivity. Such studies are of crucial interest in the framework of nuclear fusion, since the ITER nuclear reactor will operate with a full-W divertor.
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Dates et versions

hal-03164162 , version 1 (09-03-2021)

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M. Minissale, A. Durif, P. Hiret, Thierry Vidal, J. Faucheux, et al.. A high power laser facility to conduct annealing tests at high temperature. Review of Scientific Instruments, 2020, 91 (3), pp.035102. ⟨10.1063/1.5133741⟩. ⟨hal-03164162⟩
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