Large-scale 2-series aluminum alloy ingot for civil aircraft and preparation method thereof

Abstract

The invention discloses a large-scale 2-series aluminum alloy ingot for a civil aircraft and a preparation method thereof, and belongs to the field of preparation of 2-series aluminum alloys for civilaircrafts. The aluminum alloy ingot is prepared from the materials in percentage by mass: less than 0.05% of Si, less than 0.06% of Fe, 3.7% to 4.1% of Cu, 1.2% to 1.4% of Mg, less than 0.4% to 0.8%of Mn, less than 0.02% of Cr, 0.02% to 0.06% of Ti, 0.08% to 0.12% of Zr, less than 0.15% of other impurity elements, and the balance of Al. According to the large-scale 2-series aluminum alloy ingotfor the civil aircraft and the preparation method thereof, a three-stage degassing and five-stage slag removal melt purification technology, a refiner precise addition and efficient utilization technology and a casting temperature precise control technology are adopted, a series of technical problems such as melt purification, crystal grain coarsening, composition segregation and casting crackingare solved, the quality indicators of the large-scale 2-series ingot are comprehensively improved, the large-scale and high-quality 2-series aluminum alloy ingot which meets the requirements for the production and installation of a long stringer under wings of the civil aircraft is produced, and the domestic blank is filled.

Description

technical field [0001] The invention belongs to the field of preparation of 2-series aluminum alloys for civil aircraft, and in particular relates to a large-scale 2-series aluminum alloy ingot for civil aircraft and a preparation method thereof. Background technique [0002] The development level of the civil aviation manufacturing industry is a symbol of a country's strength, and it is also an important industry that promotes technological progress and economic and social development. Looking back at history, my country's large aircraft development has gone through a difficult and bumpy journey. In August 1970, my country officially launched the first large civil aircraft development project. After ten years of hard work, the first large jet passenger aircraft (Yun-10) independently developed by my country successfully made its maiden flight. However, due to various reasons, the Yunshi project was shelved in 1985. Although in the late 1980s and 1990s, my country develope...

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Problems solved by technology

[0006] The production of 2-series aluminum alloy ingots includes material preparation, smelting, refining, degassing, filtering, casting, homogenization and other processes, and the production of large-scale 2-series round ingots that meet the requirements for the use of the lower girders of civil aircraft wings still faces great challenges. In particular, the preparation of large-diameter ingots with high alloy content and low Fe and Si content faces a great risk of ingot cracking, and the casting molding rate is very low, making it difficult to achieve industrialized mass production

The alloy content of the 2-series aviation aluminum alloy material is high, and it is prone to cracking under the action of thermal stress in the casting process

In existing technical reports, the hydrogen content control of 2-series aviation aluminum alloys is generally at a level of ≤0.15ml / 100gAl, which still cannot meet the hydrogen content control requirements of aluminum alloy ingots for civil aircraft.

In addition, there is no online test for the slag content in the current casting process of the 2 series aluminum alloy ingots,

[0015] It is precisely because of the above reasons that my country is currently unable to produce 2-series aluminum alloy ingots that meet the standards.

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