Surface behavior of 16Cr3Al ODS steel—Effects of high laser intensity 1014 W/cm2 in ambiences of air, helium and vacuum
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© 2019 Elsevier B.V.
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The behavior of 16Cr3Al ODS steel (oxide dispersion strengthened steel), widely employed structural fusion material, under high-intensity laser radiation with intensity up to 10(14)W/cm(2) was investigated in air, helium and vacuum surrounding. Employed system was 65 fs laser at 804 nm, with applied pulse energy up to 5.25 mJ. Morphological effects were studied - cracking, crater parameters (depth, cross-section), LIPSS (laser-induced periodic surface structures) formation at the crater periphery, hydrodynamic effects, as well as chemical variations on the surface. Ablation thresholds were also determined for all three ambiences (for 100 applied pulses), and they were 0.30 J/cm(2), 0.23 J/cm(2) and 0.39 J/cm(2) in air, helium and vacuum, respectively. Plasma occurred in all experiments and it was most prominent in vacuum due to strongest laser-material coupling.
Keywords:ODS steel / Nuclear material / Femtosecond laser surface modification / Laser-induced damages/craters / 10(14) W/cm(2) laser intensity
Source:Fusion Engineering and Design, 2020, 150, 111360-
- Effects of laser radiation and plasma on novel materials in their synthesis, modification, and analysis (RS-172019)
- IAEA Pathways to energy from inertial fusion: Materials beyond ignition [CRP project F13016]
- European Structural and Investment Funds and the Czech Republic, the project Center of Advanced Applied Science [CZ.02.1.01/0.0/0.0/16_019/0000778] - through The Operational Programme Research, Development and Education
- Czech Ministry of Education, Youth and Sports [project LTT17015]