Study of repeated laser treatment on structure and properties aged duralyumin
Keywords:laser forming, processing, microhardness, residual stresses, dislocations
Abstract. Purpose. Identify areas of repeated laser treatment options alloy AA2024-T4 within which ensured the stability of its initial properties, identify the causes reduction in the strength characteristics of GR in excess of critical processing parameters
Design/methodology/approach Laser treatment was conducted on the technological complex «ROFIN DY 044" based on Nd: YAG laser diode pumped. Focal spot diameter (d) was 6mm. Treatment was carried out with a time interval between passes in 20 seconds
at processing speedsin terms V=7,5;10;15:15:30mm/s.. Resulting in the thermal zone were studied modern methods of materials science: X-ray diffraction, micro durometric, metallographic and other physic-methods Findings. Established that the critical values processing speedsin depend on the number of passes and in large quantities they should
not be less V=10mm/s. It is shown that microhardness reduction in processing at V<10mm/s. due to an increase in the average temperature of the workpiece, leading to the dissolution phase, strengthened.
Originality/value. Proved that in certain modes in the multiple laser processing allows to obtain high quality products with aged duralyumin.
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