Effects of Laser Energy Density on Cleaning Effect and Mechanism of TWIP Steel Surface Oxide
Aiming at the problems that the oxide layer on the surface of twin induced plasticity(TWIP)steel sheet was difficult to remove,the laser cleaning method developed in recent years was adopted.By observing and measuring the morphology and oxygen content of the surface of TWIP steel cleaned by laser with different energy densities,the effects and mechanism of laser cleaning technology on the oxide layer on the surface of TWIP steel were studied.The results show that when the energy density is higher than 12.7 J/cm2,the oxide layer thermally expands and peels off from the surface.This value is determined as the cleaning threshold of the oxide layer.When the energy density is higher than 38.2 J/cm2,the thermal ablation caused by material evaporation plays a leading role.When the energy density is higher than 50.9 J/cm2,increasing the laser energy can cause the oxidation of the substrate.The value is determined as the damage threshold of the oxide layer.The study not only provides theoretical guidance for laser cleaning in the removal of oxide layer on the surface of TWIP steel,but also provides an effective method for efficient and clean production and processing of TWIP steel.
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