Effect of selective laser melting process on internal defects and mechanical properties of TA15 titanium alloy
TA15 titanium alloy was fabricated using selective laser melting(SLM),and the focus was on investigating the impact of laser power and scanning speed on internal defects and mechanical properties.Various characterization techniques were employed,including optical microscopy(OM),scanning electron microscopy(SEM)and room-temperature tensile testing.The results reveal that the parameters of low laser power(100-125 W)and high scanning speed(1200-1600 mm/s)result in predominantly internal defects with irregular shapes,attributable to insufficient energy input during the SLM process.On the other hand,high laser power(150-200 W)and low scanning speed(800-1000 mm/s)result in regular spherical defects within the alloy due to relatively high energy input.The presence of irregular shapes or unfused defects in the alloy can significantly reduce its strength and elongation.By employing laser power of 200 W and scanning speed of 1600 mm/s,the SLM process achieves optimized parameters and results in tensile strength of(1291±4.2)MPa and elongation after fracture of(8.5±0.5)%.
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