Comparison of three kinds of hot extrusion process of titanium alloy rod, titanium Ti-6Al-4V (Ti Grade 5) rod and Titanium Ti-8Al-1Mo-1V rod

The hot extrusion of titanium alloy rod is the extrusion of powder under the condition of increasing temperature, so that the product can reach full densification. The hot extrusion method can accurately control the composition of the material and the internal structure of the alloy. The hot extrusion method can be divided into two forms: coated hot extrusion method and non-coated hot extrusion method.

For active metal titanium and titanium alloy powder, in order to prevent product oxidation, the coating hot extrusion method is often used. At this time, the first item is made of the jacket, the powder or compact is packed in the jacket, after pre-pumping and sealing, it is placed in the extruder for hot extrusion.

At this time, the coating material used should have good thermoplasticity, do not form full gold with the release material, easy to peel off after hot extrusion, convenient source and low cost. Low carbon steel or stainless steel sheet is used more.

The first process of hot extrusion of titanium alloy rod is to combine forming, sintering and hot processing, so as to directly obtain drill products with better mechanical properties.

The second process is to form titanium and titanium alloy powder. After sintering, the prepared sintered billet is hot extruded (for Ti-32Mo alloy, temperature 1000-1100℃) to obtain the properties of titanium alloy products. Effect of extrusion ratio on properties of titanium materials. As can be seen from the table, titanium materials with a theoretical density of 98.6%-99.1% can be obtained.

The third process of titanium alloy rod is the process of filling billet extrusion, which is an important method that can be used to make complex section products. The process includes: preparing the envelope cavity and determining the cavity size according to the desired final product size plus extrusion factor; Cover it. The powder is put into the cavity and shaken by vibration; Evacuation, exhaust and sealing of the envelope; Extrusion at a certain temperature and extrusion ratio; Peel off the jacket.