In conclusion, when the laser scanning speed is higher than 10 mm/s, the intensity of spectral lines increases with the increase of laser power, however, when the laser scanning speed is low, for the shape effect of molten pool surface, the relative intensity shows a decreasing trend after its original increase.
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In-situ Monitoring on Micro-hardness of Laser Molten Zone on AISI4140 Steel by Spectral Analysis.
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