Preparation method of high-performance TiAl alloy plate

Abstract

The invention relates to a preparation method of a high-performance TiAl alloy plate. The preparation method of the high-performance TiAl alloy plate aims at solving the problems that in the hot rolling process of existing TiAl alloy, due to the crystal grain growth, the nonuniform structure and stress concentration, a plate is cracked, the solid solution heat treatment process is tedious after rolling, the comprehensive performance of a TiAl alloy plate is lowered, and particularly plasticity is obviously lowered. The preparation method comprises the first step of preparation of TiAl alloy blank, the second step of sheathing, the third step of first-stage high-temperature rolling, the fourth step of second-stage high-temperature rolling, the fifth step of third-stage high-temperature rolling and the sixth step of mechanical machining and sheath removing. By means of the preparation method, crystal grains are thinned, the structure is made uniform, the plate is prevented from being cracked in the rolling process, the high-temperature deformation ability of the TiAl alloy plate is improved, and the large-size TiAl alloy plate with the excellent performance can be obtained.

Description

technical field [0001] The invention relates to a method for preparing TiAl alloy plate. Background technique [0002] With the rapid development of aviation and aerospace technology, in order to further improve the overall performance of the aircraft, higher requirements are put forward for the weight reduction, flight speed and endurance of the engine. Since TiAl alloy has low density (3.9~4.2g / cm 3 ), high specific strength and specific elastic modulus, good high-temperature strength and stiffness, excellent high-temperature oxidation resistance and high-temperature creep properties, etc., as a new type of lightweight high-temperature structural material, it is expected to become the next generation of aerospace vehicles It is an important material for high-temperature structural parts of automobile engines. However, TiAl alloys are difficult to deform at high temperatures, and defects such as cracks and uneven structures are prone to occur during hot-working and rollin...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the cracking of the plate caused by the grain growth, uneven structure, stress concentration of the existing TiAl alloy in the hot rolling process, and the cumbersome solution heat treatment process after rolling to reduce the overall performance of the TiAl alloy plate, especially The problem of obvious decrease in plasticity provides a preparation method of high-performance TiAl alloy plate