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A kind of preparation method of aluminum-lithium alloy superplastic fine-grained plate

A technology for aluminum-lithium alloys and plates, which is applied in the field of aluminum alloy thermal processing, can solve the problems of reduced dislocation density, reduced effect of grain refinement, and coarse grains, so as to suppress cracking of plates, fine grains, and realize grain size reduction. refinement effect

Active Publication Date: 2021-03-05
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the initial rolling temperature is low, rolling cracking is easy to occur. Although the rolling cracking problem can be improved by increasing the starting rolling temperature and adding the intermediate annealing process, the alloy will undergo obvious partial recrystallization, and the dislocation density will be greatly reduced. Annealing and recrystallization grains are relatively coarse, and the effect of grain refinement is reduced

Method used

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  • A kind of preparation method of aluminum-lithium alloy superplastic fine-grained plate
  • A kind of preparation method of aluminum-lithium alloy superplastic fine-grained plate
  • A kind of preparation method of aluminum-lithium alloy superplastic fine-grained plate

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preparation example Construction

[0054] see figure 1 , the present invention provides a method for preparing an aluminum-lithium alloy superplastic fine-grained plate, the method comprising the following steps S110 to S160:

[0055] In step S110, the slab whose process plasticity has been improved by forging and pressing is put into a rolling equipment for high-temperature rolling deformation to form a hot-rolled slab. In this step, the rolling start temperature of the high-temperature rolling is 400-480° C., and the rolling deformation is 30%-40%.

[0056] Step S120, taking out the hot-rolled sheet from the rolling equipment to perform solution quenching treatment. In this step, the solution temperature is 450-510° C., and the solution time is 1-3 hours.

[0057] Step S130 , put the hot-rolled plate after the re-solution quenching treatment into the rolling equipment for rolling deformation at room temperature to form a plate. In this step, the total rolling deformation of room temperature rolling is 50%-...

Embodiment 1

[0072] Test material: spray-formed 2195 aluminum-lithium alloy billet.

[0073] Experimental process: Extrusion densification, forging, solution treatment, high temperature hot rolling, solution treatment, room temperature rolling, solution treatment, overaging, low temperature rolling, and The process of combining crystallization and annealing to prepare 2195 aluminum-lithium alloy superplastic fine-grained plate, the specific implementation steps are as follows:

[0074] Step 1, removing the scale of the spray-formed aluminum-lithium alloy ingot to obtain a spray-formed aluminum-lithium alloy billet with a smooth surface, and cutting the billet into short rods of aluminum-lithium alloy with a diameter of 550mm and a length of 800-1200mm;

[0075] Step 2: Extrude and densify the spray-formed 2195 aluminum-lithium alloy ingot, the temperature of the extrusion cylinder is 430°C, the temperature of the mold is 400°C, the product speed is 0.2m / min, and the extrusion ratio is 9; ...

Embodiment 2

[0086] In step 2, the extrusion barrel temperature is 420-450°C, the mold temperature is 380-420°C, the product speed is 0.15-0.25m / min, the extrusion ratio is 8-10, and the rest are the same as in Example 1.

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Abstract

A method for preparing an aluminum-lithium alloy superplastic fine-grained plate, the preparation method comprises: placing a slab with improved process plasticity into a rolling device for high-temperature rolling deformation to form a hot-rolled plate; taking out the slab from the rolling device The hot-rolled sheet is subjected to solution quenching treatment; the hot-rolled sheet after re-solution quenching treatment is put into rolling equipment for room temperature rolling deformation to form a sheet; the sheet after room temperature rolling is taken out from the rolling equipment for over-aging treatment ; Put the over-aged aluminum-lithium alloy sheet into the rolling equipment for low-temperature rolling; take out the low-temperature rolled sheet from the rolling equipment for recrystallization annealing treatment, and then perform air cooling to prepare the aluminum-lithium alloy superplastic fine-grained sheet . In the invention, the process plasticity of the aluminum-lithium alloy slab is improved by forging and pressing, and then through high-temperature rolling, solution quenching, room temperature rolling, over-aging treatment, low-temperature rolling, recrystallization annealing and other processes to prepare fine grains (6 ~ 10μm), aluminum-lithium alloy superplastic fine-grained sheet with uniform size distribution.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy thermal processing, in particular to a preparation method of an aluminum-lithium alloy superplastic fine-grained plate. Background technique [0002] As a new type of aluminum-lithium alloy, the third-generation aluminum-lithium alloy not only has the properties of traditional aluminum-lithium alloys such as low density and high elastic modulus, but also has ultra-high strength, excellent malleability, weldability, etc. It has broad application prospects in the aerospace industry. Superplastic forming technology has good forming accuracy and is a low-cost, high-efficiency special forming method. Applying superplastic forming technology to the overall precise forming of aluminum-lithium alloy complex components can further reduce weight, improve overall rigidity, and reduce assembly. Time and difficulty are of great significance to expand the application fields of aluminum-lithium alloys, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04B21C37/02
CPCB21C37/02C22F1/04
Inventor 马晓光徐严谨韩宝帅侯红亮
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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