Method for forming Ti3Al-based alloy thin-wall barrel

Abstract

The invention provides a method for forming a Ti3Al-based alloy thin-wall barrel. The method comprises the following steps of: (1) preparing a barrel blank by using a Ti3Al-based alloy plate with the thickness of between 1.5 and 4 millimeters at the temperature of between 650 and 700 DEG C by a hot rolling and bending method; (2) penetrating and welding a weld in the bus direction of the barrel blank by continuously inputting laser through CO2 so as to obtain a thin-wall barrel; (3) preserving the heat of the thin-wall barrel at the temperature of between 950 and 1,000 DEG C for 1 to 3 hours and cooling the thin-wall barrel along with a furnace; (4) calibrating the thin-wall barrel at the temperature of between 600 and 650 DEG C; and (5) preserving the heat of the thin-wall barrel at the temperature of between 900 and 1,000 DEG C in vacuum for 1 to 2 hours and cooling in the air. Due to the adoption of the method, cracks are effectively prevented in a forming process and deformation resistance is reduced; particularly, the intensity of the weld and a parent metal is lowered by thermal treatment after welding, plasticity is enhanced, and calibration after welding is facilitated and can be performed at a relatively low temperature; simultaneously, the intensity of the barrel is enhanced integrally through final thermal treatment.

Description

technical field [0001] The invention relates to the thermal forming, shape correction, welding and post-weld heat treatment process of a cylinder, in particular to a Ti 3 Al thin-walled cylinder thermoforming, welding and post-weld heat treatment methods. Background technique [0002] Intermetallic compound refers to a compound composed of two or more metal components in proportion, which has a long-range ordered crystal structure and basic properties of metals different from its constituent elements. Ti-Al, Ni-Al, and Fe-Al intermetallic compounds are widely used in high-tech fields such as aviation, aerospace, energy, and automobiles due to their smaller density, higher strength, and better heat resistance. application prospects, especially the intermetallic compound Ti which has entered the application research stage 3 Al-based alloys have higher elastic modulus and lower density. Compared with titanium alloys, they have better high-temperature mechanical properties and...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of Ti 3 Al-based alloy plate thin-walled tube forming method to solve the problems of high deformation resistance of the alloy and difficult deformation during the thin-walled tube forming process and easy cracking or micro-cracks on the tube wall during deformation.