Study on Microstructure and Tensile Properties of Double Annealed Ti6246 Alloy Bar
The Ti6246 alloy bar was subjected to double annealing heat treatment at(930-990)℃/2 h/AC+580℃/4 h/AC.The influence of different heat treatment processes on the tensile properties of Ti6246 alloy bar was explored.The research shows that with the increase of the first-stage annealing heat treatment temperature,the α phase gradually decreases and even disappears,and the β grain boundary gradually becomes clear.The tensile strength and yield strength gradually increase,while the reduction of area and elongation after fracture gradually decrease.The fracture mechanism also changes from ductile-dimpled fracture to brittle-cleavage fracture.After double annealing heat treatment at 950℃/2 h/AC+580℃/4 h/AC,the tensile strength of Ti6246 alloy bar is 1083 MPa,the yield strength is 985 MPa,the elongation after fracture is 12%,and the reduction of area is 18%.The strength and plasticity are well matched,and better comprehensive properties are obtained.
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