An effective method for reducing oxidation and non oxidation of titanium alloy forging blanks during heating is an important direction for improving metal utilization and reducing product costs. The extrusion rod blank of BT3-1 titanium alloy was used in the study. Before forging, the blank was polished and heated to 950 ℃~980 ℃ in an electric furnace. Also add BT20, О Sample of T4-1 alloy plate and П Comparative experiments were conducted on T7M alloy pipe specimens, which were heated together with the molded billet. Parts such as elbows, tees, and crosses were molded using BT3-1 alloy billets. Titanium forging manufacturers have studied the effects of the following factors on the physical and mechanical properties of parts: pre low-temperature oxidation treatment, glass enamel protective coating, heating medium and heating method, and surface treatment after die forging.
Titanium alloy forging manufacturers treat blanks that have not undergone pre oxidation treatment with a fish like surface, and the pre oxidation treated blanks have a smooth surface. In addition, the glass enamel coating on the surface of the pre oxidized hot pressed billet is very easy to remove. The surface layer state (oxidized and aspirated) has a significant impact on the mechanical properties, especially plasticity, of hot forging blanks, and sandblasting can improve plasticity. On the basis of pre oxidation treatment of the billet, coating with glass enamel coating can also improve the surface plasticity of the billet.
When heating titanium alloy billets in a regular electric furnace, if the temperature exceeds the allogeneic transformation temperature and the holding time is within 1 hour, it will not cause obvious suction on the surface layer, and conventional sandblasting treatment can easily remove the suction layer. The method of heating the blank before forging in the pseudo liquefied layer of loose material is a method that deserves special attention. This heating method is the most effective way to enhance the heat exchange process between particles, gases, and the surface of the billet. The heat transfer efficiency in the pseudo liquefaction layer of loose materials is 1.5 orders of magnitude higher than that in a forced convection heating furnace, roughly equivalent to the heat transfer efficiency in a molten salt furnace.
