Heat treatment method for deformation of high-toughness aluminum alloy

Abstract

The invention belongs to the technical field of aluminum alloy heat treatment, and discloses a heat treatment method for deformation of a high-toughness aluminum alloy. Comprising the following steps: preserving the heat of an aluminum alloy workpiece at 455 + / -2 DEG C for 1 hour, and quickly cooling in a quenching device; cold rolling is conducted for 6 times in the environment of 24-28 DEG C, the first rolling reduction is 2.2 mm, and the remaining rolling reduction is reduced by 25%; annealing at 400-450 DEG C for 70 minutes, and then carrying out water quenching; and keeping the temperature at 128 DEG C for 16-18 hours, and then carrying out air cooling. According to the method, the recrystallization nucleation rate of the deformed alloy is remarkably increased through high-temperature annealing, rapid recovery and recrystallization of the alloy occur, coarsening growth of a precipitated phase can be inhibited through short-time heat preservation, recrystallization grains can be inhibited from growing, then a high-supersaturation-degree fine grain structure is obtained, finally aging treatment is conducted, a large number of solute atoms are precipitated, and therefore the high-supersaturation-degree fine grain structure is obtained. The strength of the alloy is further improved, and the plasticity and toughness of the alloy are remarkably improved through good matching of a fine grain structure and a precipitated phase.

Description

technical field [0001] The invention belongs to the field of heat treatment of aluminum alloys, in particular to a heat treatment method for deformation of aluminum alloys, in particular to a heat treatment method for deformation of aluminum alloys for sports bicycles. Background technique [0002] Aluminum alloy has a series of advantages such as low density, high specific strength, good formability and corrosion resistance, low cost, etc., and has a wide range of applications in the field of bicycles. Heat treatment of aluminum alloys can improve the mechanical properties of aluminum alloys, enhance corrosion resistance, improve processing properties, and obtain dimensional stability. [0003] The traditional aluminum alloy hot-rolled sheet manufacturing process includes multiple passes of warm and hot rolling, recrystallization annealing between passes, and subsequent secondary solid solution and aging treatment. Although the human ITMT process can effectively refine the...

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Problems solved by technology

[0003] The traditional aluminum alloy hot-rolled sheet manufacturing process includes multiple passes of warm rolling, hot rolling, recrystallization annealing between passes, and subsequent secondary solution and aging treatment. Although the artificial ITMT process can effectively refine the grain structure, it also has major shortcomings. For example, the overaging treatment before deformation reduces the plastic deformation ability of the material, and makes it difficult for the coarse precipitated phase to be well-formed in the subsequent heat treatment process. At the same time, quenching is required in the heat treatment process of aluminum alloy. Most of the quenching in the prior art is to directly immerse the aluminum alloy parts in cold water slowly, because a large amount of water vapor will be generated when the aluminum alloy parts are in contact with cold water. In turn, the surface of the workpiece will be covered with a layer of water vapor film, which will reduce the cooling rate of the workpiece, resulting in soft spots and affecting the quality of the workpiece

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