山东工业技术

本文设置不同退火温度对TA15钛合金进行热处理，利用扫描电子显微镜观察组织演变，结合室温拉伸测试，系统研究退火温度对合金组织与性能的影响规律。结果表明：在相对低温（940～960℃）退火处理条件下，材料主要由初生α相和少量次生α相组成，合金的抗拉强度和屈服强度保持相对稳定，断口表面以高密度韧窝为主要形貌特征，同时存在少量准解理断裂区域。随着退火温度上升至980～1000℃，初生α相逐渐溶解消失，次生α相的析出数量明显增加，显微组织中出现明显β晶粒，合金表现出显著的强化效果，断裂模式发生明显转变，表现为典型的解理断裂特征，包括明显的解理台阶和岩石形貌，整体呈现脆性断裂形貌。

In this paper, TA15 titanium alloy was heat treated at different annealing temperatures. The microstructure evolution was observed by scanning electron microscopy. Combined with room temperature tensile test, the influence of annealing temperature on the microstructure and properties of the alloy was systematically studied. The results show that under the condition of relatively low temperature( 940-960 ℃) annealing treatment, the material is mainly composed of primary α phase and a small amount of secondary α phase. The tensile strength and yield strength of the alloy remain relatively stable. The fracture surface is characterized by high-density dimples, and there is a small amount of quasi-cleavage fracture zone. As the annealing temperature rises to 980 ～ 1000 ℃, the primary α phase gradually dissolves, the number of secondary α phase precipitates increases significantly, and obvious β grains appear in the microstructure. The alloy shows a significant strengthening effect, and the fracture mode changes significantly, showing typical cleavage fracture characteristics, including obvious cleavage steps and rock morphology, showing brittle fracture morphology as a whole.