A cryogenic electric pulse treatment method for removing residual stress of ultrafine-grained aluminum-lithium alloy strips

An aluminum-lithium alloy and residual stress technology, which is applied in the field of metal material rolling, can solve the problems of large residual stress, low toughness, and high dislocation density of materials, and achieve near-mechanical properties and low residual stress.

Active Publication Date: 2021-06-04
CENT SOUTH UNIV +1
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Problems solved by technology

However, ultrafine-grained metal materials prepared by the macroplastic method have very high strength, however, the toughness is relatively low
The main reason is that the dislocation density of the material is relatively high, resulting in a relatively large residual stress of the material.

Method used

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  • A cryogenic electric pulse treatment method for removing residual stress of ultrafine-grained aluminum-lithium alloy strips

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Embodiment Construction

[0023] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0024] Ultrafine-grained aluminum-lithium alloys are more than 30% stronger than conventional aluminum-lithium alloys, and have important application prospects in the field of lightweight components. The present invention utilizes the cryogenic pulse current treatment method to eliminate the residual stress in the ultra-fine-grained aluminum-lithium alloy material, so that the grain size of the material does not change, but the dislocation density is effectively reduced, the residual stress of the material is reduced, and it is useful for subsequent material processing. The reduction of material springback in the preparation process has important application prospects. The specific principle is: in the cryogenic environment, the grain size of the aluminum-lithium alloy is stable and will not grow up. At the same time, the pulse current is used ...

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Abstract

A cryogenic electric pulse treatment method for ultra-fine-grained aluminum-lithium alloy thin strips to remove residual stress. The aluminum-lithium alloy thin strip coils are installed on the left side coiler, and the thin strips pass through guide rollers, cryogenic boxes, and conductive rollers in sequence. And connect the right side coiling machine, in which the conductive roller is placed in the cryogenic box; keep the temperature of the cryogenic box stably maintained at -60 ° C ~ -20 ° C; start the right side coiling machine, and slowly roll the aluminum-lithium alloy thin strip from the left side The crimping machine transitions to the right crimping machine; start the pulse power supply and apply pulse current to the conductive roller; increase the speed of the right crimping machine to a high speed, so that the residual stress of the aluminum-lithium alloy strip after the cryogenic pulse current treatment is fully released. The invention can eliminate the high residual stress in the ultra-fine-grained aluminum-lithium alloy without changing the grain size of the material, so that the aluminum-lithium alloy plate still has high strength after forming, but only has small springback.

Description

technical field [0001] The invention belongs to the technical field of metal material rolling, and in particular relates to a cryogenic electric pulse treatment method for removing residual stress of an ultrafine-grained aluminum-lithium alloy thin strip. Background technique [0002] Aluminum-lithium alloys are widely used in aerospace. In recent years, as the energy crisis and special application background have again promoted the development of lightweight aluminum alloys, it is eager to significantly reduce the weight of aircraft and maintain good overall performance. The addition of lithium can not only reduce the density of aluminum alloy, but also increase the modulus of elasticity, and can also make the alloy exhibit a strong aging strengthening effect. Compared with 2-series and 7-series aluminum alloys, the density of aluminum-lithium alloys can be reduced by 10%, while the specific stiffness can be increased by 25%, which has attracted widespread attention from e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04C22F3/00
CPCC22F1/04C22F3/00
Inventor 李红萍喻海良章骏黄建科聂志宁王旭
Owner CENT SOUTH UNIV
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