Ti-6Al-4V (Ti Grade 5) alloy titanium alloy shaped parts, titanium alloy forgings, titanium alloy block forging process exploration

Ti-6Al-4V (Ti Grade 5) alloy because of its high specific strength, high temperature resistance, corrosion resistance and other advantages, is widely used in aerospace, aviation and shipbuilding and other fields, the most used titanium alloy is still Ti-6Al-4V (Ti Grade 5) alloy alloy. For ordinary Ti-6Al-4V (Ti Grade 5) alloy forgings, the production process is relatively mature, while the Ti-6Al-4V (Ti Grade 5) alloy shaped forgings used in certain aerospace models have larger quality, strict performance requirements, and more complex forging process. It is necessary to study the forging process of the shaped forgings in the production process, and sum up the law of the influence of the forging process on the microstructure and mechanical properties of the forgings. Thus the most suitable forging process is worked out. The effects of two kinds of forging processes on the microstructure and tensile properties of Ti-6Al-4V (Ti Grade 5) alloy alloy shaped forgings used in aerospace were studied.

In class I forging process, the first and second fire heating temperatures are in the β single-phase region, the first fire heating temperature of class II forging process is in the β single-phase region, and the second fire heating temperature is in the (α+β) two-phase high temperature region. The experimental results show that the lamellar structure with coarse grain is obtained by the type I forging process, and the strength and plasticity of this type of structure are low, which can not meet the index requirements. The fine mixed structure composed of strip α and fine equiaxial α can be obtained by using the type II forging process, that is, the second fire heating temperature in the high temperature two-phase region and the large forging ratio. The microstructure has good tensile properties and meets the requirements of the index. When forging, the way of reversing and upsetting can ensure the uniform macroscopic structure of special-shaped forgings.