首页|Microstructure Evolution and High Strength-Ductility Synergy of Ti-13Nb-13Zr-2Ta Alloy Fabricated by Laser Powder Bed Fusion
Microstructure Evolution and High Strength-Ductility Synergy of Ti-13Nb-13Zr-2Ta Alloy Fabricated by Laser Powder Bed Fusion
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This work systematically investigates the densification,microstructure evolution and the attainment of high strength-duc-tility in Ti-13Nb-13Zr-2Ta alloy processed by laser powder bed fusion(LPBF).A narrow and viable process window(Plaser power=175 W,vscanning speed=1000 mm/s,hscanning distance=0.1 mm and dlayer thickness=0.03 mm)was accordingly deter-mined and the relative density of Ti-13Nb-13Zr-2Ta alloy reaches 99.76％.The depth of molten pool increases gradually with the increase of energy density,and the relationship between the depth of molten pool and energy density has been quantitatively described.Three types of α'martensites with average grain width less than 3 μm can be observed in the LPBF-fabricated Ti-13Nb-13Zr-2Ta alloys,attributed to the significantly high cooling rate and remelting process.The fine grain size,high density dislocations,nanotwins,ordered oxygen complexes and α+α"heterostructure all contributed to the high strength(1037.75±25.18 MPa)and ductility(20.32％±1.39％)of LPBF-fabricated Ti-13Nb-13Zr-2Ta alloy in this work.
Laser powder bed fusionTi-13Nb-13Zr-2TaMicrostructureMechanical behavior
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