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A kind of forging method and application of low direction sensitive 7xxx series aluminum alloy

An aluminum alloy, sensitive technology, applied in the direction of metal processing equipment, etc., can solve the problems of insufficient rheological properties in the "dead zone", reduce the direction sensitivity of forgings, and insufficient recrystallization process, etc., and achieve uniform microstructure and isotropic properties of forgings , No reduction in surface performance, and the effect of reducing direction sensitivity

Active Publication Date: 2022-07-12
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a forging method and application that reduces the direction sensitivity of 7xxx series aluminum alloy forgings, avoiding the rheological properties of 7xxx series aluminum alloys due to insufficient recrystallization process and "dead zone" during forging Insufficient leads to anisotropy in properties and reduces orientation sensitivity of forgings

Method used

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  • A kind of forging method and application of low direction sensitive 7xxx series aluminum alloy
  • A kind of forging method and application of low direction sensitive 7xxx series aluminum alloy
  • A kind of forging method and application of low direction sensitive 7xxx series aluminum alloy

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Effect test

Embodiment 1

[0050]Example 1: The blank is 7085 aluminum alloy with 150×200×200 mm. The blank was heated to 460°C, kept for 2 hours, then placed at 340°C, kept for 2 hours, and pre-forged at 340°C for multiple passes, from 200mm to 130mm; then the forgings were heated to 460°C and kept for 2 hours. Recrystallized but will not grow up, and it takes longer to keep warm when growing up), hot forging at 460 ° C, forging from 130 mm to 90 mm, during the hot forging process, the upper and lower surfaces are sprayed with coolant until the surface temperature reaches 380 ° C, and the forging is completed. Air-cooled.

Embodiment 2

[0052] Example 2: The blank is 7A85 aluminum alloy with 150×200×200 mm. The blank was heated to 460°C, kept for 2 hours, then placed at 340°C, kept for 2 hours, and pre-forged at 340°C for multiple passes, from 200mm to 130mm; then the forgings were heated to 460°C, kept for 2 hours, and hot forged at 460°C. , Forging from 130mm to 90mm, during the hot forging process, the upper and lower surfaces are sprayed with coolant until the surface temperature reaches 380 °C, and air cooling is performed after forging.

Embodiment 3

[0054] Example 3: The blank is 7085 aluminum alloy with 150×200×200 mm. The blank was heated to 460°C, kept for 2 hours, then placed at 340°C, kept for 2 hours, and pre-forged at 340°C for multiple passes, from 200mm to 130mm; then the forgings were heated to 460°C, kept for 2 hours, and hot forged at 460°C. , Forging from 130mm to 90mm, during the hot forging process, the upper and lower surfaces are sprayed with coolant until the surface temperature reaches 380 °C, and air cooling is performed after forging.

[0055] The size of the final plate after the treatment of the comparative example and the example is 330×200×90mm. The material prepared in the comparative example and the example is heat-treated to T6 or T74 state. Example 1, Comparative Example 2, and Example 2 all adopt the T6 aging system and age at 120°C / 34h; Comparative Example 3 and Example 3 all adopt the T74 aging system, and perform two-stage aging at 120°C / 7h+160°C / 10h . Table 1 shows the comparison of pro...

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Abstract

The invention belongs to the field of metal material processing, and relates to a forging method and application of a low-direction-sensitive 7xxx series aluminum alloy. The forging method includes a combination of moderate temperature forging, differential temperature forging and hot forging. The invention proposes a forging method for reducing the directional sensitivity of 7xxx series aluminum alloy forgings, which enables the alloy to obtain a large number of fine grains in the high direction, improves the rheological properties of the central part of the forgings, improves the anisotropic uniformity of the thick plate, and improves the comprehensive performance. Forging orientation sensitivity is reduced. The process designed by the present invention is particularly suitable for manufacturing aluminum alloy materials with large thickness and cross-section specifications of more than 90 mm.

Description

technical field [0001] The invention belongs to the field of metal material processing, and relates to a forging method and application of a low-direction-sensitive 7xxx series aluminum alloy. Background technique [0002] 7xxx series high-strength aluminum alloys are widely used in aerospace, military and transportation fields. In order to reduce weight, there is an urgent need for large-thick section 7xxx series aluminum alloy forgings to support the overall manufacturing of large and complex parts, while large-thick section 7xxx series alloy forgings generally use high-temperature forging technology, which is prone to "dead zone", that is, the rheological properties of the central part Insufficient, unable to produce enough deformation during forging, resulting in strong directional sensitivity of alloy forgings, mainly manifested as elongation anisotropy index exceeding 50%, fracture toughness difference of more than 30% in different directions, and high directional stre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00C22F1/04
CPCB21J5/002C22F1/04
Inventor 黄兰萍刘文胜邓运来郭晓斌肖代红尹萧
Owner CENT SOUTH UNIV
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