Improvement of tial alloy sheath and method of applying it for large deformation rolling

Abstract

The invention discloses a TiAl alloy-improved sheath and a method for performing large-deformation-amount plate rolling by applying the TiAl alloy-improved sheath, belongs to the field of TiAl alloy rolling machining, and aims to solve the problems that sheath materials are wasted by a thick sheath and a plate blank which is subjected to small-deformation-amount multi-pass rolling cracks easily. The rolling method comprises the following steps: firstly, loading a TiAl alloy plate blank into the sheath, heating the sheath to a plate rolling temperature, and preserving the heat of a machined workpiece; secondly, transferring the machined workpiece to a plate rolling machine, controlling the total deformation amount of the first pass to be 30 to 50 percent, performing secondary plate rolling after temperature preservation, controlling the total deformation amount in the second pass to be 20 to 30 percent of the thickness of the remaining workpiece, and leveling after the temperature preservation; thirdly, performing slow cooling treatment on the machined workpiece. According to the improved sheath, a cover plate is welded on each of the upper surface and the lower surface of a rectangular frame; arranging a heat conducting gasket on each of the upper surface and the lower surface of the TiAl alloy plate blank; the thicknesses of the cover plates above and below the plate blank are reduced. According to the TiAl alloy-improved sheath and the method for performing the large-deformation-amount plate rolling by applying the TiAl alloy-improved sheath, structures with different thicknesses are adopted by the TiAl alloy improved sheath, and large-deformation-amount rolling is performed, so that cracking phenomena during a TiAl alloy plate rolling process are effectively reduced.

Description

technical field [0001] The invention belongs to the field of TiAl alloy rolling processing, and particularly relates to an improved rolling sleeve and a method for rolling TiAl alloy using the same. Background technique [0002] The hot working conditions of TiAl alloys are relatively harsh. This is because of the inherent brittleness of TiAl alloys. Once the mechanical state deteriorates during high temperature deformation, for example, there is a state of tensile stress, TiAl alloys are prone to cracks and fractures. The temperature range in which TiAl alloys can successfully undergo high temperature deformation is very narrow. The hot working of TiAl alloys is carried out under isothermal conditions, and the cost of hot working under isothermal conditions is very high, making it difficult to mass-produce. Therefore, the rolling of TiAl alloys generally adopts the method of wrapping TiAl alloy slabs with metal materials and performing quasi-isothermal rolling under the con...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the existing large-thickness sheath wastes sheath material and the small deformation multi-pass rolling slab is easy to cause the slab to break, and to provide an improved TiAl alloy sheath and apply it for large-deformation rolling board method

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