In the field of titanium alloy heat treatment technology, a heat treatment method of Ti45Nb titanium alloy wire is disclosed. The method includes the following steps: The Ti45Nb titanium alloy wire to be treated is placed in muffle furnace, heated to 750 ~ 860℃ for preheating, then kept for 0.5 ~ 1.6h, and then cooled to room temperature. By controlling preheating temperature, holding time and cooling mode, the method makes the microstructure of Ti45Nb titanium alloy wire after heat treatment uniform, and meanwhile improves the comprehensive mechanical properties such as tensile strength, yield strength, shear strength and elongation of Ti45Nb titanium alloy wire. It provides a good technical support for the application of Ti45Nb titanium alloy wire in the production of aviation fasteners.
As an advanced material for aviation fasteners, Ti45Nb has a density of only 5.7g/cm3, excellent corrosion resistance, high specific strength, good mechanical properties and machining properties, and is suitable for manufacturing rivets for composite materials. The United States from the 1980s began to Ti45Nb titanium alloy rivets widely used in various advanced military and civil aircraft, has completely replaced the pure titanium rivets. Meanwhile, the alloy is used with Ti-6Al-4V titanium alloy to make bimetal rivets, which are widely used in Boeing and Airbus aircraft. At present, the United States in the aerospace products all use cold processing performance excellent titanium niobium rivets.
This paper provides a heat treatment method for Ti45Nb titanium alloy wire. The internal structure of Ti45Nb titanium alloy wire after treatment by this method is uniform, the mechanical properties are greatly improved, and the internal structure and mechanical properties of the wire are well matched.
In order to achieve the above purposes, the first part of the invention provides a heat treatment method for Ti45Nb titanium alloy wire. The method includes the following steps: The Ti45Nb titanium alloy wire to be treated is placed in muffle furnace, heated to 750 ~ 860℃ for preheating, then kept for 0.5 ~ 1.6h, and then cooled to room temperature.
The heat treatment method of Ti45Nb titanium alloy wire, by controlling preheating temperature, holding time and cooling mode, makes the microstructure structure of Ti45Nb titanium alloy wire uniform after heat treatment, and improves the comprehensive mechanical properties such as tensile strength, yield strength, shear strength and elongation of Ti45Nb titanium alloy wire. It provides a good technical support for the application of Ti45Nb titanium alloy wire in the production of aviation fasteners.
