A Method for Regulating the Uniformity of Grain Structure of Aluminum Alloy Forgings

Abstract

The invention provides a method for regulating and controlling the grain structure uniformity of an aluminum alloy forge piece. The method comprises the following steps of S1, carrying out a low-temperature small deformation experiment on the aluminum alloy forge piece with a thick surface layer grain structure; S2, carrying out solid solution heat treatment on the forge piece obtained after the deformation experiment in the step S1, wherein the solid solution temperature is 380 DEG C-480 DEG C, and the solid solution time is 2 h-4 h; and S3, carrying out aging treatment on the forge piece subjected to the solid solution heat treatment in the step S2, wherein the aging temperature is 120 DEG C-180 DEG C, and the aging time is 6 h-12 h. According to the method, the purpose of regulating andcontrolling the grain structure uniformity of the aluminum alloy forge piece is achieved by using the low temperature and the small deformation, and a novel technology is provided for improving the quality of the aluminum alloy forge piece.

Description

technical field [0001] The invention belongs to the technical field of forging, and relates to a method for regulating the grain structure uniformity of an aluminum alloy forging. Background technique [0002] The 7XXX series aluminum alloy has the advantages of high strength and toughness, good plasticity and heat treatment, and has been widely used in the vehicle industry and engineering equipment, especially in the aerospace field. [0003] Under the conventional hot die forging process conditions of large alloy forgings, the surface deformation temperature of the forgings is low and the deformation amount is small, resulting in low dislocation density, which cannot provide energy for recrystallization behavior, and the surface structure is a coarse original grain structure. However, recrystallization occurs in the core of the forging, energy is released, and the grain structure is fine and uniform. This kind of coarse grain structure on the surface exists widely in alum...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for controlling the grain structure uniformity of aluminum alloy forgings, which adopts a low-temperature small deformation process to increase the dislocation density of the surface layer of the forgings, and combines the heat treatment process to promote the static recrystallization of the material, so as to achieve a small deformation The purpose of controlling the uniformity of the grain structure of alloy forgings is to solve the problem that the existing methods are difficult to obtain aluminum alloy forgings with uniform structure in the core of the surface layer under the conditions of lower temperature and smaller deformation

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