Heat treating process of titanium alloy in antivacuum furnace

Abstract

The invention provides a titanium alloy non-vacuum furnace heat treatment process, which comprises four procedures of manufacturing a heat treatment box, placing a work piece in the heat treatment box, vacuum pumping the heat treatment box and performing the heat treatment. By utilizing the process, the surfaces of titanium alloy parts are non oxidation and show the original color before treatment or little golden yellow, the stress of the product is removed by more than 55 percent, and the indexes of the mechanical performances meet the standard requirement. In the process, a titanium alloy welding test plate of which 6 is equal to 20mm, is subjected to annealing heat treatment, and the annealing process is as follows: the plate is heated up to the temperature of 650 DEG C, kept the temperature for 90 minutes and air cooled to room temperature. The welding residual stress of the welding test plate is measured by the blind hole measurement before and after the heat treatment of the welding test plate, the tensile strength of the welding test plate and the impact toughness of a welding seam heat affected zone are also measured before and after the heat treatment of the welding test plate, and the results meet the requirement, thereby solving the problems that a factory is not equipped with the vacuum heat treatment furnace or the production of small batch of products is not worthy of using the large-sized titanium alloy vacuum furnace and increasing yield; moreover, the process also has the advantages of short temperature rise time, short processing period, high yield and reliable product quality of products.

Description

technical field [0001] The invention belongs to the technical field of heat treatment and annealing, in particular to a non-vacuum furnace heat treatment process for titanium alloys. Background technique [0002] Titanium alloy is a material with excellent properties such as corrosion resistance and high specific strength. It is currently widely used in aviation, aerospace, shipbuilding, chemical and other industries. A large number of large-scale marine titanium alloy structures and products have large stresses in the forming process of forging, welding, etc., and require an annealing process for heat treatment. Due to the high-temperature chemical activity of titanium alloys, it is very easy to react with hydrogen and oxygen elements. Usually, the annealing of titanium alloy materials is carried out in a vacuum furnace. However, for the heat treatment of large titanium alloy structures and products, it is generally impossible to use a vacuum furnace for heat treatment due...

AI Technical Summary

Problems solved by technology

However, for the heat treatment of large titanium alloy structures and products, it is generally impossible to use a vacuum furnace for heat treatment due to the limitation of the volume of the vacuum furnace, and the high price and complicated maintenance of the vacuum annealing furnace also have certain restrictions on its application.

However, other traditional anti-oxidation heat treatment methods, such as applying anti-oxidation paint on the surface, soon after heat treatment, the surface of the workpiece will turn yellow and blue, and the oxidation is serious, which greatly affects all aspects of the performance of the workpiece.