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A 500MPa-level low-Cu Mg-free aluminum alloy and a preparation method thereof

An aluminum alloy, C-460 technology, applied in the field of alloying design and heat treatment of 500MPa low-Cu and Mg-free aluminum alloys, can solve problems such as increasing production costs, reduce usage, ensure performance requirements, and have excellent tensile strength. Effect

Active Publication Date: 2019-04-09
AECC COMML AIRCRAFT ENGINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of Cu and Mg elements directly determines the production cost, and the addition of Cu and Mg elements in the existing 2-series aluminum alloys greatly increases the production cost

Method used

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  • A 500MPa-level low-Cu Mg-free aluminum alloy and a preparation method thereof
  • A 500MPa-level low-Cu Mg-free aluminum alloy and a preparation method thereof
  • A 500MPa-level low-Cu Mg-free aluminum alloy and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0036] The composition of the aluminum alloys of Examples 1-3 is the same, and the smelting, casting, forging billet heating and rolling processes are the same, the difference lies in the subsequent heat treatment process system, the specific process is as follows:

[0037] (1) Smelting: A furnace of aluminum alloy was smelted, and its actual chemical composition (% by weight) is Cu: 3.62%, Mn: 0.73%, Fe: 0.41%, Si: 0.38%, Zn: 0.30%, Ti: 0.15%, Ni: 0.08%, and the balance is Al. The cast slab has undergone heat inspection and stack cooling for 48 hours. The surface quality of the slab before entering the furnace is good, and there is no grinding of the slab.

[0038] (2) Slab heating and rolling: hot-roll the homogenized annealed 30±2mm thick plate at 460-480℃ to 6.5±0.5mm at 440-460℃, and then solid solution at 480-500℃ for 1-2h Quenching immediately after that, and then cold rolling to 1.5±0.5mm thin plate at room temperature.

[0039] (3) Heat treatment process and equipme...

Embodiment 4-6

[0046] The composition of the aluminum alloys of Examples 4-6 is the same, and the smelting, casting, forging billet heating and rolling processes are the same, the difference lies in the subsequent heat treatment process system, the specific process is as follows:

[0047] (4) Smelting: A furnace of aluminum alloy was smelted, and its actual chemical composition (% by weight) is Cu: 3.82%, Mn: 0.61%, Fe: 0.31%, Si: 0.14%, Zn: 0.12%, Ti: 0.07%, Ni: 0.5%, and the balance is Al. The cast slab has undergone heat inspection and stack cooling for 48 hours. The surface quality of the slab before entering the furnace is good, and there is no grinding of the slab.

[0048] (5) Slab heating and rolling: the casting slab heating temperature is selected as 430°C, the holding time is 1.5h, and the cooling method is cooled to 250°C with the furnace at a cooling rate of less than 30°C / h and then air-cooled to room temperature; at 450°C The homogenized annealed thick plate is hot rolled fro...

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Abstract

The invention relates to a 500MPa-level low-Cu Mg-free aluminum alloy and a preparation method. The 500MPa-level low-Cu Mg-free aluminum alloy comprises the following chemical components in percentageby weight: 3.3-3.8% of Cu, 0.6-0.9% of Mn, 0.4-0.7% of Zn, 0.5-0.8% off Fe, 0%-0.5% of Si, 0%-0.15% of Ti, 0%-0.1% of Ni, and the balance being Al and inevitable impurities. The method includes: annealing the casting blank by adopting a standardized complete annealing process system; carrying out hot rolling on the homogenizing annealed casting blank, carrying out solid solution treatment, immediately quenching, and carrying out cold rolling to obtain a thin plate; performing classified aging process for thin plates as in the following: 200 DEG C / 11-14h+230-250 DEG C / 30-60min+180-200 DEG C / 10-14 h, the 500 MPa-level low-Cu Mg-free aluminum alloy plate with the thickness of 1.5 + / -0.5 mm is obtained.

Description

technical field [0001] The invention belongs to the field of alloy materials, and in particular relates to an alloying design and heat treatment method of a 500MPa low-Cu Mg-free aluminum alloy. Background technique [0002] The 2-series aluminum alloy is a typical hard aluminum alloy with good overall performance and reasonable composition. It can be strengthened by heat treatment and has good mechanical properties and processing properties. It is mainly used in aircraft skins, bulkheads, wing ribs, spars, rivets, Missile components, truck hubs, propeller elements and other construction and transportation structural parts. Cu and Mg are the main elements added to the alloy, so in addition to the solid solution of aluminum in the alloy, after quenching, the alloying elements exist in the form of constituent phases, on the one hand, it plays the role of solid solution strengthening, on the other hand, it plays the role of precipitation strengthening role. However, the addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/12C22C21/14C22C21/18C22F1/057
CPCC22C21/12C22C21/14C22C21/18C22F1/057
Inventor 昝娜
Owner AECC COMML AIRCRAFT ENGINE CO LTD
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