Features and Efficiency of Nanosecond Laser Ablation in High-Carbon Steel Caused by Yb:YAG Laser Pulsed Scanning Beam.

Autor: Mikhailov, S. B., Gorny, S. G., Sharikov, A. N.
Zdroj: Inorganic Materials: Applied Research; Jun2024, Vol. 15 Issue 3, p606-616, 11p
Abstrakt: The results of ablation experiments are given for the case for a scanning beam of nanosecond range pulsed laser radiation using targets made of high-carbon U13 and low-carbon St30 steel grades. The dependence of the depth and power efficiency of ablation on the power density is determined in the range q = 4 × 108–1010 W/cm2. It is established that the maximum efficiency of removing the material is obtained when q = 4 × 109 W/cm2 for a target made of U13 steel and q = 7 × 108–5 × 109W/cm2 for St30 steel. The size distribution is estimated for emitted microparticles. It is established that irradiation of high-carbon steel results in generating a flow of particles deposited on the target surface (back flow). The mechanism of this back flow is associated with formation of nanosized condensate particles. On the basis of the reflectivity measurements and on the studies of the microstructure of the irradiated surface using electron microscopy methods, a hypothesis is put forward that the higher ablation efficiency of high-carbon steel U13 compared to low-carbon steel St30 depends on the process of condensation of supersaturated carbon vapor on the target surface. This process can increase the absorption capacity of the irradiated target surface. As a result, the efficiency of material removal during the subsequent scanning pass is increased. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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