i60 合金棒材中的织构及其对拉伸性能的影响

Microstructure and texture of titanium alloy are determined by thermomechanical and heat treatments and can significantly affect the mechanical properties of the final products. In this work, the microstructureand texture evolution during the heat treatment in a /b and b phase field in Ti60 precision forging bars were investigated. The results implied that the actual deformation temperature gradually decreased during precision forging processes. The microstructure and texture of Ti60 bar were determined by the finish forging temperature and the diameter, and strong microtexture macrozones existed in the forged Ti60 bar. For the bar with diameter of 45 mm (D45), the finish forging temperature fell in the lower temperature region of the a /b phase field, and the main a textures in these bars were and fiber texture components in initial Ti60 bar. The similarity of the microstructure and texture were found after heat treatment at 950 . The intensity of fiber texture gradually decreased while that of fiber texture increased with the increase of the heat treatment temperature. Heat treatments have little influence on the strength of forged Ti60 bars of D45, while their ductility was reduced after b heat treatment. For the bar with diameter of 30 mm (D30), the finish forging temperature was below the a /b phase field, and the main a texture in those bars was fiber texture component. The intensity of fiber texturein those bars increased while that of fiber texture gradually decreased with the increase of the heat treatment temperature. Their room temperature strength significantly increased with the increase of the heat treatment temperature, and yield strength and tensile strength reached to 1086 and 1144 MPa, respectively, but the elongation only 3.3% after b heat treatment.