发动机用Ti600高温钛合金组织及力学性能研究

Research on Microstructure and Mechanical Properties of Ti600 High Temperature Titanium Alloy for Engine

应用光学显微镜、X射线衍射仪、力学性能测试等手段对航空发动机用Ti600高温钛合金的微观组织及力学性能进行了实验测试研究。结果表明:Ti600合金板材主要由等轴初生α晶粒和少量层片状的α+β共晶组织构成,晶粒细小,组织均匀,晶粒尺寸主要分布在2~4μm左右。Ti600合金板材在常温下具有较高的强度和塑性,随着温度的升高,抗拉强度和屈服强度表现出微弱的增长趋势,延伸率明显增大。Ti600合金板材为塑性断裂,具有韧窝型断口。

The microstructure and mechanical properties of Ti600 high temperature titanium alloy for engine were researched by optical microscope,X-ray diffractometer and mechanical property test. The results show that Ti600 plate is mainly composed of equiaxed primary a grains and a small amount of lamellar α＋β eutectic tissue. Ti600 alloy has small grains and uniform microstructure,and its average gain size is about 2- 4 μm. Ti600 alloy plate has high strength and plasticity at room temperature. With the increase of temperature,tensile strength and yield strength show a weak increasing trend, while elongation rate significantly increases. Ti600 titanium alloy plate is characterized by ductile fracture,with a dimple fracture.