Titanium alloys are widely used in aerospace, aviation, and ships due to their advantages of high specific strength, high temperature resistance, and corrosion resistance. At present, the most widely used titanium alloys are TC4 alloys. For ordinary TC4 titanium alloy forgings, the production process is relatively mature, and a certain type of TC4 special-shaped forgings for aerospace has higher quality, strict performance indicators, and more complicated forging processes. It is necessary to study the forging process of the special-shaped forgings in the production process and conclude The influence of forging process on the microstructure and mechanical properties of forgings, so as to formulate the most suitable forging process. The technicians studied the effects of two types of forging processes on the microstructure and tensile properties of TC4 titanium alloy shaped forgings for aerospace.
Among them, the heating temperature of the first fire and the second fire in the type Ⅰ forging process are in the β single-phase region, the heating temperature of the first fire in the type Ⅱ forging process is in the β single-phase region, and the heating temperature of the second fire is in the (α + β) two Phase high temperature area. The experimental results show that: the lamellar structure with coarse grains is finally obtained under the type Ⅰ forging process. This type of structure has low strength and plasticity, which cannot meet the requirements of the index; the type Ⅱ forging process is adopted, that is, the second heating temperature is two phases at high temperature In addition, a large forging ratio can be used to obtain a fine mixed structure composed of strip-shaped α and fine equiaxed α, which has good tensile properties and meets the requirements of the index. During forging, the method of reversing long heading can ensure the uniform macrostructure of special-shaped forgings.