The microstructure of alloy Ti 3Al 10Nb 3V 1Mo after heated at 1170℃ for 1 h and cooled to room temperature at different rates was investigated by TEM. The result showed that W.Q. microstructure consisted of sing...The microstructure of alloy Ti 3Al 10Nb 3V 1Mo after heated at 1170℃ for 1 h and cooled to room temperature at different rates was investigated by TEM. The result showed that W.Q. microstructure consisted of single B2 phase, A.C. microstructure consisted of B2 phase matrix and second phase in some regions of the B2 phase crystal grains, and C.C. and F.C. microstructure appeared as a Widmannstatten structure consisting of coarse α 2 phase plates and β phase stripes between the plates. With the decreasing of colling rate, the tension strength was obviously decreased and the plasticity was slightly increased at room temperature.展开更多
In the present paper, the relations between the microstructure and the properties of Ti-14Al-21Nb and Ti-14Al-20Nb-3.5V-2Mo alloys at different temperatures and different cooling rates of heat treatment were re-vealed...In the present paper, the relations between the microstructure and the properties of Ti-14Al-21Nb and Ti-14Al-20Nb-3.5V-2Mo alloys at different temperatures and different cooling rates of heat treatment were re-vealed by X-ray , optical microscope , HVTEM , auto-graphical-analyser and mechanical properties test at roomand high temperature. The experimental results show as follows: at 1040～1120℃ 14h WQ, the microstruc-ture of Ti-14Al-21Nb bar is primary phaseα_2+B2. With temperature increasing, the primary α_2 phase de-crease and the mechanical properties ultimate tensile strength (UTS), yield strength (YS) and elongation(EL) at room temperature increase. When it has reduced the α_2 phase by 50% (at 1080℃/4h WQ) , the me-chanical properties at room temperature are excellent , EL being 10. 5%. Following the α_2 phase reduces contin-uously , UTS, YS are going up, but EL is going down. After heated at two phases range and cooled down tothe room temperature with furnace, the microstructure of Ti-14Al-20Nb-3.5V-2Mo alloy is the equiaxed α_2+needle-like α_2+βphase. The mechanical properties at room temperature and 700℃ are fairly good.展开更多
文摘The microstructure of alloy Ti 3Al 10Nb 3V 1Mo after heated at 1170℃ for 1 h and cooled to room temperature at different rates was investigated by TEM. The result showed that W.Q. microstructure consisted of single B2 phase, A.C. microstructure consisted of B2 phase matrix and second phase in some regions of the B2 phase crystal grains, and C.C. and F.C. microstructure appeared as a Widmannstatten structure consisting of coarse α 2 phase plates and β phase stripes between the plates. With the decreasing of colling rate, the tension strength was obviously decreased and the plasticity was slightly increased at room temperature.
文摘In the present paper, the relations between the microstructure and the properties of Ti-14Al-21Nb and Ti-14Al-20Nb-3.5V-2Mo alloys at different temperatures and different cooling rates of heat treatment were re-vealed by X-ray , optical microscope , HVTEM , auto-graphical-analyser and mechanical properties test at roomand high temperature. The experimental results show as follows: at 1040～1120℃ 14h WQ, the microstruc-ture of Ti-14Al-21Nb bar is primary phaseα_2+B2. With temperature increasing, the primary α_2 phase de-crease and the mechanical properties ultimate tensile strength (UTS), yield strength (YS) and elongation(EL) at room temperature increase. When it has reduced the α_2 phase by 50% (at 1080℃/4h WQ) , the me-chanical properties at room temperature are excellent , EL being 10. 5%. Following the α_2 phase reduces contin-uously , UTS, YS are going up, but EL is going down. After heated at two phases range and cooled down tothe room temperature with furnace, the microstructure of Ti-14Al-20Nb-3.5V-2Mo alloy is the equiaxed α_2+needle-like α_2+βphase. The mechanical properties at room temperature and 700℃ are fairly good.
