热处理过程对Ti-6Al-4V-10Nb合金显微组织和拉伸性能的影响（英文）

Effect of heat treatment processing on microstructure and tensile properties of Ti-6Al-4V-10Nb alloy

研究热处理过程对Ti-6Al-4V-10Nb合金显微组织和力学性能的影响。采用扫描电镜、透射电镜和X射线衍射仪对合金显微组织进行研究,并通过拉伸试验对其室温和高温力学性能进行评估。结果表明,锻造和热处理后的主要组织为板条和球状初生α相、次生α相和β相。次生α相的尺寸明显小于初生α相的尺寸。热处理后,初生α相的体积分数减少,次生α相的体积分数增加。随着固溶温度的升高,初生α相的体积分数明显减少,次生α相的体积分数明显增加。随着固溶温度的升高,Ti-6Al-4V-10Nb合金的屈服强度和抗拉强度明显提高。

Effects of heat treatment processing on the microstructure and mechanical properties of Ti-6Al-4V-10Nb alloy were investigated. The microstructures were investigated by SEM, TEM and XRD, and the mechanical properties were evaluated by tensile tests at room and elevated temperatures. The results indicate that the lath-like and globular primary α phase, secondary α phase and β phase are obtained after forging and heat treatment processing. The size of secondary α phase is much smaller than that of primary α phase. After heat treatment, the volume fraction of primary α phase is decreased, and that of secondary α phase is increased. With the increase of solution temperature, the volume fraction of primary α phase is gradually decreased, and that of secondary α phase is obviously increased. The yield strength and tensile strength of Ti-6Al-4V-10Nb alloy are significantly enhanced with the solution temperature increasing.