Effect of aging time on microstructures and properties of TC4 titanium alloy prepared by laser powder bed fusion
TC4 titanium alloy was prepared by laser powder bed fusion technology,and then the formed TC4 alloy was subjected to direct aging heat treatment.The effects of different aging times on the microstructures and proper-ties of TC4 titanium alloy were studied.After aging treatment,β phase was precipitated,which played the role of second phase strengthening.With the increase of aging time,β phase precipitated increased,the strength increased,and 6 h had the best performance.As the aging time continued to increase,the β-phase become coarser and the strength decreased.The TEM results show that there are a large number of twins after aging treatment,and so the plasticity is better.The tensile strength and yield strength of 550 ℃/6 h are 1 204.6 MPa and 866.0 MPa,and the elongation after breaking is 11.3％.Compared with the printed state,the hardness after aging treatment is signifi-cantly improved,and the microhardness after aging heat treatment can reach 394.4HV.
laser powder bed fusionTC4 Titanium alloydirect agingmicrostructuresmechanical properties
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