Effect of Heat Processing Technique on Microstructure and Mechanical Properties of Extrusion Beta Titanium Alloy Tube Blank

The effects of extrusion temperature and heat treatment on the microstructure and mechanical properties of beta-CEZ titanium alloy tube blank were studied with an emphasis on the relationship between the heat processing technique and microscopic structure. The results show that the extruded tube blank of beta-CEZ titanium alloy at alpha-beta phase has better tensile strength and plasticity match, and the ductility of the alpha-beta phase extrusion is obviously better than that of the single beta-phase extrusion, especially the reduction of area. When the extruded tube is heat treated at 830 degrees C and 860 degrees C solid solution, with the increase of aging temperature, the strength of tube decreases and the plasticity increases. When the aging temperature is up to 600 degrees C, the reduction of area of the tube increases obviously. When the extruding tube is aged at 550 degrees C and 600 degrees C, the strength of the tube increases and the plasticity decreases with the increase of the solid solution temperature. The titanium alloy of beta -CEZ is extruded below the phase transition point after low temperature solid solution and high temperature aging treatment, which can achieve good microstructure and performance matching. The tensile strength is greater than 1250MPa, the elongation is more than 15%, and the reduction of area is more than 40%. The microstructure was a fine and uniform equiaxed structure.