Method for preparing TiAl alloy plate through sheathing ply rolling

Abstract

The invention belongs to the technical field of metal material processing, and relates to a method for preparing a TiAl alloy plate through sheathing ply rolling. The method comprises the following steps of preparing a cuboid TiAl alloy blank; sheathing; hot rolling, specifically, the pass rolling reduction and the rolling speed are controlled according to the following formulas, 0.15 < delta hn / hn-1 < = 0.3 (when n is equal to 1 and 2), 0.1 < = delta hn / hn-1 < = 0.15 (when n is equal to 3,..., n is equal to N-2), 0.05 < = delta hn / hn-1 < 0.1 (when n is equal to N-1 and N), delta hn > delta hn + 1, 0.1 s <-1 >< = vn / hn-1 < = 2s <-1 >, and the total rolling deformation is 50%-70%; and finally, the sheath is removed, the surface of the TiAl alloy is treated according to needs, and the TiAl alloy plate is obtained. The TiAl alloy plate which is free of cracks on the surface, uniform in thickness and uniform in structure is efficiently prepared by adopting a sheathing mode, multi-pass accurate process control and a composite ply rolling method.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and relates to a method for preparing TiAl alloy plates by sheathing and rolling. Background technique [0002] TiAl alloy is a new type of light-weight and high-temperature-resistant structural material. It has been used as aeroengine compressor and turbine blades, as well as turbine and exhaust valve structures of automobile and tank engines. At the same time, the wings and rudder structures of hypersonic vehicles, the thermal protection structures of the fuselage, wings, and empennages, and some parts of the tail nozzles of advanced aero-engines all put forward urgent needs for TiAl alloy plates. [0003] Due to the very poor thermal processing performance of TiAl alloy, the narrow thermal processing window, and the complex stress and tension state of the slab during the sheet rolling process, and the high strain rate, it is very difficult to roll and form TiAl alloy sheets. ...

AI Technical Summary

Problems solved by technology

[0006] A number of patents related to the preparation of TiAl alloy sheets have been reported, but they all use a package to prepare a TiAl alloy sheet. At the research level, most of the research phases are aimed at the adaptability of the sheath structure, hot rolling process-sheet forming, and process-structure correlation. The preparation cost of TiAl alloy sheet prefabricated billets is relatively high. In the process research stage, waste of TiAl billets will be avoided. , resulting in the preparation of a TiAl alloy sheet with one jacket. There is no public report on the wrapping and rolling of TiAl alloy sheets.

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