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Casting process of aluminum alloy ingots for ships and warships

A technology of aluminum alloy ingot casting and casting process, which is applied in the field of aluminum alloy casting process and anti-gravity casting process of aluminum alloy ingot for ships, which can solve the problems of unfavorable alloy corrosion resistance, lack of alloy precipitation and growth control, etc. Achieve the effects of preventing oxidation slag inclusion defects, improving the grain growth process, and fine and uniform precipitation

Inactive Publication Date: 2018-09-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent (CN 105543738 B) is a deformation heat treatment method for aluminum alloys. This invention increases the precipitated phase density of the alloy and improves the mechanical properties of the alloy through double-stage aging at low temperature and high temperature. However, this method lacks the intergranular phase of the alloy. Precipitation and growth control are not conducive to effectively improving the corrosion resistance of alloys

Method used

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  • Casting process of aluminum alloy ingots for ships and warships
  • Casting process of aluminum alloy ingots for ships and warships
  • Casting process of aluminum alloy ingots for ships and warships

Examples

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Effect test

Embodiment 1

[0057] An aluminum alloy ingot, with the following mass percentages: Mg: 3.3%, Si: 2.12%, Mn: 0.5%, Cr: 0.3%, Zr: 0.3%, Ti: 0.05%, B: 0.005%, Fe <0.01%. Specific preparation process:

[0058] a. Before melting and casting, preheat the aluminum alloy and the master alloy at a certain temperature for a certain period of time to remove moisture and impurities. During the melting and casting process, the relative humidity at room temperature should be strictly controlled below 40%. When the aluminum block melts 50%, add a special covering agent (the following components are melted and synthesized under high temperature conditions: 25% NaCl, 30% MgCl: 30% BaCl and 15% carnallite), then add Al-Mn master alloy, Al-Si master alloy, Al-Zr master alloy, Al-Cr master alloy in order, and finally when the melt temperature rises to 740 ° C, Add pure Mg wrapped in aluminum foil, Al-Ti-B modifier (TiB 2 The size of the phase is less than 2μm, and the mass content is above 85%, TiAl 3 The ...

Embodiment 2

[0071] An aluminum alloy ingot, the ingredients are formulated according to the mass percentage of the following elements: Mg: 1.9%, Si: 2.9%, Mn: 0.5%, Cr: 0.3%, Zr: 0.3%, Ti: 0.05%, B: 0.005%, Fe <0.01%. Specific preparation process:

[0072] a. Before melting and casting, preheat the aluminum alloy and the master alloy at a certain temperature for a certain period of time to remove moisture and impurities. During the melting and casting process, the relative humidity at room temperature should be strictly controlled below 40%. When the aluminum block melts 60%, add a special covering agent (the following weight ratio components are melted and synthesized under high temperature conditions: 25% NaCl, 30% MgCl: 30% BaCl and 15% carnallite), then add Al-Mn master alloy, Al-Si master alloy, Al-Zr master alloy, Al-Cr master alloy in order, and finally when the melt temperature rises to 740 ° C, Add pure Mg covered with aluminum foil, Al-Ti-B master alloy (TiB 2 The size of the...

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Abstract

The invention discloses a casting process of aluminum alloy ingots for ships and warships. The process comprises the following steps that A, alloys are smelted to obtain aluminum alloy melts; B, the aluminum alloy melts are subjected to counter gravity casting, and the aluminum alloy ingots are obtained; and C, the obtained aluminum alloy ingots are sequentially subjected to homogenization, solidsolution treatment and aging treatment, and the aluminum alloy ingots for the ships and warships are obtained. The process can obtain the aluminum alloys with the excellent comprehensive properties like tensile strength, yield strength, ductility and exfoliating corrosion resistance, solves the problems that when existing aluminum alloys are applied on ships, the aluminum alloys are poor in corrosion resistance and low in intensity, and accordingly prolonging the service life of the ships in complex and atrocious environments of the ocean.

Description

technical field [0001] The invention relates to an aluminum alloy casting process, in particular to an anti-gravity casting process for aluminum alloy ingots for ships, and belongs to the technical field of non-ferrous metal processing. Background technique [0002] Aluminum alloy has low density and high strength ratio. After thermal processing, it can obtain good mechanical properties and corrosion resistance. It also has excellent electrical conductivity, thermal conductivity and processing performance. It has been widely used in ships and marine equipment. Ship materials (ship plate, ship shell, superstructure, bulkhead structure, frame, etc.) require mechanical properties such as high tensile strength, elongation and impact resistance, as well as high corrosion resistance. [0003] At present, most of the aluminum alloys used in ships are corrosion-resistant and weldable aluminum alloys with medium strength, such as 5xxx series and 6xxx series aluminum alloys: Among the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22F1/043C22F1/047B22D18/04C22C21/02C22C21/08
CPCC22C1/026B22D18/04C22C1/03C22C1/06C22C21/02C22C21/08C22F1/043C22F1/047
Inventor 罗兵辉任智炜郑亚亚柏振海
Owner CENT SOUTH UNIV
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