Effects of laser power and exposure time on microstructure and mechanical properties of selective laser melting of TC11 titanium alloy
TC11 titanium alloy samples were formed by selective laser melting technology,the effects of laser pow-er(220-260 W)and exposure time(45-55 μs)on the microstructure and mechanical properties of the samples were studied.The results show that the laser power and exposure time mainly affect the laser power density during the forming process,resulting in differences in microstructure and mechanical properties:when the laser power density increases,the liquid retention time is relatively long,the cooling rate is relatively low,the columnar crystal size is relatively large,and the martensite lath size increases;When the exposure time is 50 μs and the laser power is in-creased to 260 W,the microhardness of SLM forming specimen increases to 437 HV0.3,the tensile strength increas-es to 1 463 MPa,and the elongation after fracture decreases to 6.0％;When the laser power is 200W and the expo-sure time is increased to 55 μs,the microhardness of SLM formed specimen increases to 404.2 HV0.3,the tensile strength increases to 1 446 MPa,and the elongation after fracture decreases to 4.8％.When the laser power is 220 W and the exposure time is 50 μs,TC11 titanium alloy with better matching strength and plasticity can be obtained,and its tensile strength and elongation after fracture are 1 345 MPa and 10.6％respectively.
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