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研究TA15板材在不同条件下真空退火后的力学性能、显微组织和断口形貌。结果表明:相比非真空退火,真空退火显著提高板材的力学性能。随着退火温度的升高,相界面和次生α相增多,但初生α相体积分数减少,从而导致板材的强度提高,伸长率降低。双重退火后获得的次生α相更加细小。在(950°C/2 h,AC)+(600°C/2 h,AC)下双重退火获得了良好的力学性能,其抗拉强度、屈服强度和延伸率分别为1070 MPa,958 MPa和15%。从拉伸断口形貌可以看到,最深最大的韧窝出现在850°C退火试样上,说明在该温度下退火板材塑性最好。
The mechanical properties, microstructure and fracture morphology of TA15 sheet after vacuum annealing under different conditions were studied. The results show that, compared with non-vacuum annealing, vacuum annealing significantly improves the mechanical properties of the sheet. With the increase of annealing temperature, the phase interface and secondary α phase increased, but the volume fraction of primary α phase decreased, which led to the increase of plate strength and the decrease of elongation. The secondary α phase obtained after double annealing is finer. Double annealing at (950 ° C / 2 h, AC) + (600 ° C / 2 h, AC) achieved good mechanical properties with tensile strength, yield strength and elongation of 1070 MPa and 958 MPa, respectively 15%. It can be seen from the tensile fracture morphology that the deepest and largest dimple appears on the annealed sample at 850 ° C, indicating that the plasticity of the annealed sheet is the best at this temperature.