The microstructure evolution and mechanical properties of the as-deposited γ-TiAl-based alloy specimen fabricated via laser melting deposition and as-annealed specimens at different temperatures were investigated.The...The microstructure evolution and mechanical properties of the as-deposited γ-TiAl-based alloy specimen fabricated via laser melting deposition and as-annealed specimens at different temperatures were investigated.The results show that the microstructure of as-deposited specimen is composed of fineα2(Ti3Al)+γlamellae.With the increase of annealing temperature,the bulk γ m(TiAl)phase gradually changes from single γ phase toγphase+acicularα2 phase,finally small γ phase+lamellar α2+γ phase.Compared with the mechanical properties of as-depositedγ-TiAl alloy(tensile strength 469 MPa,elongation 1.1%),after annealing at 1260℃ for 30 min followed by furnace cooling(FC),the room-temperature tensile strength of the specimen is 543.4 MPa and the elongation is 3.7%,which are obviously improved.展开更多
基金Project(2017YFB1103600)supported by the National Key Research and Development Program of China。
文摘The microstructure evolution and mechanical properties of the as-deposited γ-TiAl-based alloy specimen fabricated via laser melting deposition and as-annealed specimens at different temperatures were investigated.The results show that the microstructure of as-deposited specimen is composed of fineα2(Ti3Al)+γlamellae.With the increase of annealing temperature,the bulk γ m(TiAl)phase gradually changes from single γ phase toγphase+acicularα2 phase,finally small γ phase+lamellar α2+γ phase.Compared with the mechanical properties of as-depositedγ-TiAl alloy(tensile strength 469 MPa,elongation 1.1%),after annealing at 1260℃ for 30 min followed by furnace cooling(FC),the room-temperature tensile strength of the specimen is 543.4 MPa and the elongation is 3.7%,which are obviously improved.
