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摘要
The effects of scanning speed on the remelting layer depth, microhardness, surface roughness, and tensile and fracture behaviors of high energy density laser surface remelting CuCr50 alloy were investigated. The results show that with the increase of scanning speed from 2000 mm/min to 8000 mm/min, the average depth of remelting layer decreases from (486. 2±32. 8) μm to (26. 8±13. 4) μm and the average microhardness increases from 203 HV to 250 HV, which is about three times of the substrate microhardness (85 HV). The surface roughness increases with the decrease of scanning speed. The yield strength of CuCr50 alloy after laser remelting treatment on one side surface is 16. 5% ? 28. 0% higher than that of untreated alloy. The fracture morphology of the remelting layer is equiaxed dimple, showing the ductile fracture. The fracture morphology of the substrate is mainly intergranular fracture extending along the grain boundary, showing the brittle facture. Thus, mechanical properties including microhardness and yield strength of the modified CuCr50 alloy are greatly improved. By modulating the scanning speed, laser surface modified alloy with better comprehensive performance can be obtained.
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