7-series aluminum alloy cast ingot for large-specification die forging and control method for hydrogen content of 7-series aluminum alloy cast ingot

A technology for aluminum alloy ingots and die forgings, which is applied in the field of preparation of 7 series aluminum alloy ingots, and can solve the problems of large size, fluctuations in melting and casting technology control, fatigue life and tensile strength effects, etc.

Inactive Publication Date: 2022-01-25
SOUTHWEST ALUMINUM GRP +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] However, due to the high degree of alloying and wide solidification range of the 7-series aluminum alloy, this determines that its alloy ingots are prone to internal metallurgical defects such as micro-porosity and regional composition segregation, and micro-porosity will reduce the quality of the ingot. Mechanical properties, especially for large-scale castings, have a greater impact on their fatigue life and tensile strength
[0004] However, for the existing production of 7 series aluminum alloy ingots, especially the ingots of large-scale die forgings for aerospace, due to strict requirements and large size, the existing conventional production process is based on the production of large-scale ingots of 7 series aluminum alloys. It is easy to fluctuate in the control of melting and casting technology, and it is difficult to meet the index requirements of ingots for large-scale die forgings, resulting in poor quality of ingots

Method used

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  • 7-series aluminum alloy cast ingot for large-specification die forging and control method for hydrogen content of 7-series aluminum alloy cast ingot
  • 7-series aluminum alloy cast ingot for large-specification die forging and control method for hydrogen content of 7-series aluminum alloy cast ingot
  • 7-series aluminum alloy cast ingot for large-specification die forging and control method for hydrogen content of 7-series aluminum alloy cast ingot

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preparation example Construction

[0081] The invention provides a method for preparing a 7-series aluminum alloy ingot for large-scale die forgings, comprising the following steps:

[0082] 1) after batching the aluminum alloy raw material, put it into a furnace for smelting to obtain a raw material melt;

[0083] The additive Al-Be master alloy is added in the converter launder;

[0084] 2) after the raw material melt obtained in the above steps is refined in a furnace and degassed online, it is cast to obtain a 7-series aluminum alloy ingot;

[0085] The melting temperature is 740-760°C.

[0086] In the present invention, firstly, the aluminum alloy raw material is batched and smelted in a furnace to obtain a raw material melt; wherein, the additive Al-Be master alloy is added in a converter launder.

[0087] In the present invention, the aluminum alloy raw materials preferably include one or more of Zn ingots, Cu plates, Mg ingots, Al-Zr master alloys and remelted high-precision aluminum ingots, more pref...

Embodiment

[0110] For chemical composition control, see Table 1. Table 1 shows the composition control content of the 7-series aluminum alloy ingot for large-scale die forging prepared in the embodiment of the present invention.

[0111] Table 1

[0112]

[0113] (1) The proportion of returned material: ≤60%, using Al-Ti rods for batching.

[0114] (2) Al-Be addition temperature and timing: 740-760°C, add in the converter launder

[0115] (3) Purification in the static furnace: the refining medium is argon, the argon pressure is 0.25-0.4MPa, the argon flow rate is 10-20L / min / block, and the manual refining is assisted twice for a total of 35 minutes. The refining temperature is 725-745°C.

[0116] (4) On-line purification process: gas pressure 0.1-0.3Mpa, rotor speed 230-270rpm. Ar gas flow rate 3.5-5Nm 3 / h, Cl gas flow 0.03-0.045Nm 3 / h

[0117] (5) Filtration device: 60+600ppi in parallel

[0118] (6) Casting process parameters: casting speed 45-50mm / min, water flow 70-90m ...

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Abstract

The invention provides a 7-series aluminum alloy cast ingot for a large-specification die forging. The thickness of the 7-series aluminum alloy cast ingot ranges from 450 mm to 520 mm; the width of the 7-series aluminum alloy cast ingot ranges from 1620 mm to 2000 mm; the hydrogen content of the 7-series aluminum alloy cast ingot is less than or equal to 0.08 ml/100g.Al. The 7-series aluminum alloy cast ingot for the large-specification die forging is obtained and has stable and low hydrogen content, so that the micro-porosity size of the cast ingot can be remarkably reduced, the metallurgical quality of the cast ingot is improved, and a good foundation is laid for subsequent research and development of new and high-performance aluminum alloy materials. According to the preparation process, the hydrogen content can be stably controlled by utilizing own conditions, so that the internal metallurgical quality of the cast ingot is improved; and the method is simple and clear in process, easy to understand and operate by operators, high in field performability and more suitable for popularization and application of industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of 7-series aluminum alloy ingots, and relates to a 7-series aluminum alloy ingot for large-scale die forgings and a preparation method thereof, in particular to a 7-series aluminum alloy ingot for large-scale die forgings and a Hydrogen content control method of 7-series aluminum alloy ingots for large-scale die forgings. Background technique [0002] 7-series aluminum alloy, that is, Al-Zn-Mg-Cu super duralumin, is widely used in parts manufactured by CNC cutting, suitable for aircraft frames and high-strength accessories. The 7-series aluminum alloy contains zinc and magnesium elements, and zinc is the main alloying element in this series, so the corrosion resistance is quite good. Adding a little magnesium alloy can make the material reach very high strength after heat treatment. This alloy is an ultra-high-strength wrought aluminum alloy that has been used in the aircraft manufacturing i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03B22D7/00
CPCC22C21/10C22C1/026C22C1/03B22D7/005
Inventor 朱敏张欢欢王清松阙基荣王彬孙黎明曹以恒
Owner SOUTHWEST ALUMINUM GRP
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