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Grain refinement machining process of hard aluminium alloy cast ingot

A hard aluminum alloy and processing technology, applied in the field of metal processing, can solve problems such as increasing cooling strength, and achieve the effects of refining as-cast grains, improving fatigue resistance and thermal stability

Active Publication Date: 2013-02-27
丛林铝业科技(山东)有限责任公司
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Problems solved by technology

When the casting speed is reduced, the cooling intensity will increase

Method used

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  • Grain refinement machining process of hard aluminium alloy cast ingot
  • Grain refinement machining process of hard aluminium alloy cast ingot
  • Grain refinement machining process of hard aluminium alloy cast ingot

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Embodiment Construction

[0018] The fine-grain refinement processing technology of the hard aluminum alloy ingot of the present invention comprises the following steps;

[0019] (1) Dosing first: the base of the alloy is made of 99.85 grade aluminum ingot, and Mg and Zn elements are added in the form of pure metals. Considering that Cu, Cr, Ti, and Zr elements have high melting points and low content in the alloy, the middle added in the form of an alloy;

[0020] (2) Afterwards, the regenerative gas furnace is used for melting, the melting temperature does not exceed 750°C, and the residence time of the melt in the melting furnace does not exceed 2 hours;

[0021] (3) In the smelting process, after the chemical composition and temperature have been adjusted by sampling and analysis, the furnace must be poured as soon as possible. The mass percentage of Si is controlled at 0.12%, the mass percentage of Fe is controlled at 0.18%, and the mass percentage of Mg is controlled at 0.18%. The content is con...

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Abstract

The invention provides a grain refinement machining process of a hard aluminium alloy cast ingot, belonging to the technical field of aluminum alloy machining. The grain refinement machining process comprises the following steps of: blending, smelting, stirring, temperature measuring, sampling, component and temperature regulating, turning down, refining (namely primary purifying), standing, online adding of Al-Ti-B wires, online degassing and deslagging (namely secondary purifying), two-stage filtering, hot-top casting at a same level, and homogenizing of the cast ingot, thus completing grain refinement machining of the hard aluminium alloy cast ingot. The hard aluminium alloy cast ingot machined by the machining process has a better heat deformation property, is high in strength through online quenching during extruding, has better welding and corrosion resistance properties and a certain stress corrosion resistance property, and especially has a high shock absorption capacity as well as a good folding resistance property.

Description

technical field [0001] The invention relates to metal processing, in particular to a fine-grained processing technology for hard aluminum alloy ingots. Background technique [0002] The 7N01 alloy is an alloy in the Japanese Aluminum Alloy Standard and belongs to the Al-Zn-Mg series alloy. The extruded profiles produced by this alloy ingot are generally stressed structural parts of high-speed railway car bodies, such as traction beams, frame bolsters, end beams, etc. How to process aluminum alloy ingots with properties similar to or better than 7N01 alloy is a problem to be solved in the same industry in China at present. At present, in the production process of processing 7N01 alloy, defects such as columnar crystals and feather crystals often appear in ingots. These defects will be "inherited" to the extruded material in subsequent production, reducing the mechanical properties of the crystal. Feather crystals have thick and straight crystal axes, and the mechanical pro...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/03C22C1/06B22D27/20
Inventor 张培良苏振佳王刚高安江吴英杰苏本显徐群峰
Owner 丛林铝业科技(山东)有限责任公司
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