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7050 aluminum alloy forged ring heat treatment process

An aluminum alloy and forging ring technology, applied in the field of heat treatment process of 7050 aluminum alloy forging ring, can solve the problems of large anisotropy of mechanical properties and inability to meet the requirements of super-strength and super-toughness, so as to improve the comprehensive mechanical properties and weaken the various properties of materials. Anisotropic effect

Pending Publication Date: 2022-03-08
WUXI PAIKE HEAVY CASTING & FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of aerospace technology, the requirements for related materials are becoming more and more stringent. The existing 7050 aluminum alloy has a large anisotropy in mechanical properties, and its longitudinal elongation can reach more than 10%, while the long and transverse direction is only 4%. The short transverse direction is only 3%, which cannot meet the requirement that the three-dimensional elongation rate should reach more than 4.5%, and currently cannot meet the requirements of super strong and super tough.

Method used

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  • 7050 aluminum alloy forged ring heat treatment process
  • 7050 aluminum alloy forged ring heat treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A 7050 aluminum alloy forging ring heat treatment process, such as figure 1 shown, including the following steps:

[0026] Step S1:

[0027] (1) Prepare the billet, the composition percentage of each chemical element in the alloy is Cr≤0.06; Zr: 0.06~0.18; Mg: 1.7~3.1; Zn: 5.3~6.8; Ti: 0.01~0.07; Mn: 0.05~0.01; Si: 0.07-0.013; the balance is Al.

[0028] (2) Billet heat treatment: a. Isothermal treatment: heat the billet to a temperature of 426° C. and keep it warm for 10 hours. b. Second isothermal treatment: After the first isothermal treatment and heat preservation, the billet is heated to 465°C for 12 hours.

[0029] (3) Ring rolling the billet to the designed size includes: a. High-speed ring expansion; b. Uniform speed ring rolling; c. Ring billet shaping. Forging rolling size Φ2290±5×Φ2128±5×1360±5mm.

[0030] Step S2:

[0031] The forging is heated to a constant temperature of 455°C, and then kept for a period of time, the holding time is 5h, and finally q...

Embodiment 2

[0040] The steps different from Embodiment 1 are:

[0041] Step S1:

[0042] (2) Billet heat treatment: a. Isothermal treatment: heat the billet to a temperature of 431° C. and keep it warm for 10 hours. b. Second isothermal treatment: After the first isothermal treatment and heat preservation, the billet is heated to 469°C and kept for 12 hours.

[0043] Step S2:

[0044] The forging is heated to 460°C at a fixed temperature, and then kept for a period of time, the holding time is 5h, and finally quenched. The quenching water temperature range is 40°C.

[0045] Step S4: The forging is subjected to three-stage artificial aging treatment, which specifically includes:

[0046] First-level aging: set temperature at 121°C, then keep it warm for 20 hours.

[0047] Secondary aging: set temperature at 177°C, keep warm for 4 hours, then take out of the oven and water-cool for 6-10 minutes.

[0048] Three-level aging: set the temperature at 121°C, keep it warm for 24 hours, and th...

Embodiment 3

[0050] The steps different from Embodiment 1 are:

[0051] Step S1:

[0052] (2) Billet heat treatment: a. Isothermal treatment: heat the billet to a temperature of 435° C. and keep it warm for 10 hours. b. Second isothermal treatment: after the first isothermal treatment and heat preservation, heat the billet to 477°C for 12 hours.

[0053] Step S2:

[0054] The forging is heated to a constant temperature of 465°C, and then kept for a period of time, the holding time is 5h, and finally quenched, the quenching water temperature range is 45°C.

[0055] Step S4: The forging is subjected to three-stage artificial aging treatment, which specifically includes:

[0056] First-level aging: set temperature at 123°C, then keep it warm for 20 hours.

[0057] Secondary aging: set temperature at 185°C, keep warm for 4 hours, then take out of the oven and water-cool for 6-10 minutes.

[0058] Three-level aging: set the temperature at 122°C, keep it warm for 24 hours, and then take it ...

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Abstract

According to the technical scheme, the 7050 aluminum alloy forged ring heat treatment process comprises the following steps that S1, a blank is prepared, after heat treatment is conducted on the blank, the blank is subjected to ring rolling to the designed size, and a forged piece is obtained; s2, the forge piece is heated to 455-465 DEG C at a constant temperature, then heat preservation is conducted for a period of time, and finally quenching is conducted; s3, carrying out compression cold deformation on the ring piece in the radial direction by using a mandrel supporter; s4, the forge piece is subjected to three-stage artificial aging treatment, in first-stage aging, the temperature is set to be 117-123 DEG C, and then heat preservation is conducted; the temperature is set to be 173-185 DEG C, heat preservation is conducted, and then discharging and water cooling are conducted; the temperature is set to be 115-122 DEG C, heat preservation is conducted, and then discharging and air cooling are conducted. The method has the advantages that the anisotropy of the material is weakened, the index requirement for super-strong and super-toughness of the material is met, and the strength and toughness of the material are improved.

Description

technical field [0001] The invention relates to the field of aluminum alloy material processing, in particular to a heat treatment process for a 7050 aluminum alloy forging ring. Background technique [0002] 7050 aluminum alloy is a high-strength wrought aluminum alloy that can be strengthened by heat treatment in the aluminum-zinc-magnesium-copper system. The alloy itself has a high degree of alloying and has extremely high strength, good fracture resistance, and excellent fatigue resistance. Based on the alloy itself Excellent performance, it is widely used in the aerospace field for the manufacture of high-strength parts. However, with the development of aerospace technology, the requirements for related materials are becoming more and more stringent. The existing 7050 aluminum alloy has a large anisotropy in mechanical properties, and its longitudinal elongation can reach more than 10%, while the long and transverse direction is only 4%. The short transverse direction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/40C22C21/10C22F1/053
CPCC21D9/40C22F1/053C22C21/10
Inventor 刘美铃刘其源何方有蒋小飞王骏艾志斌李兴品
Owner WUXI PAIKE HEAVY CASTING & FORGING