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Modification and refinement method of hypoeutectic aluminum-silicon alloy

Inactive Publication Date: 2020-03-24
SHANGHAI HUIZHONG AUTOMOTIVE MFG
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Problems solved by technology

[0008] The technical problem to be solved in the present invention is to overcome that when Sr and B are used simultaneously in the prior art, if the addition ratio is improperly controlled, Sr and B react to form SrB 6 , while reducing defects such as modification and refinement effects, providing a method for modification and refinement of hypoeutectic Al-Si alloys

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  • Modification and refinement method of hypoeutectic aluminum-silicon alloy
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  • Modification and refinement method of hypoeutectic aluminum-silicon alloy

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[0041] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same numbers will be used throughout the drawings to refer to the same or like parts.

[0043]In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the description of the present invention may be selected by the applicant according to his or her judgment, and the detailed meanings thereof are set forth herein described in the relevant section of the description. ...

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Abstract

The invention provides a modification and refinement method of hypoeutectic aluminum-silicon alloy, which comprises the steps of S1, smelting A356 aluminum alloy, and controlling the components of thealloy liquid within a standard range, wherein the content of Ti is less than 10ppm; and S2, performing modification treatment to ensure that the content of Sr in the alloy melt is 100-250ppm, the content of B in the alloy melt is 100-200ppm, and the mass ratio of Sr to B is 1-2. According to the modification and refinement method of hypoeutectic aluminum-silicon alloy, the treated A356 aluminum alloy melt contains a very small amount of Ti (less than 10ppm), so that the Ti-Si binary alloy phase formed by reaction of Ti and Si elements can be prevented from contaminating the melt and reducingthe refinement effect on the one hand; and on the other hand, a Ti-containing refiner does not need to be additionally added, so that the cost can be reduced to a certain extent.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy smelting and casting, in particular to a method for modifying and refining a hypoeutectic aluminum-silicon alloy. Background technique [0002] In the prior art, A356 aluminum alloy, as a hypoeutectic aluminum-silicon alloy, has light weight, good casting performance (such as good fluidity, no thermal cracking tendency, small linear expansion coefficient), good mechanical properties (such as tensile , high impact and fatigue strength) and good corrosion resistance, etc., are the main materials used for middle and high-end automobile hubs and steering knuckles. [0003] The typical as-cast structure of A356 aluminum alloy includes α-Al, eutectic silicon, Fe-containing phase and Mg 2 Si is equal. Among them, eutectic silicon is a brittle phase, which is usually in the shape of elongated needles before modification. It is easy to cause stress concentration at its end under the action of ext...

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Application Information

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IPC IPC(8): C22C1/03C22C21/04
CPCC22C1/026C22C1/03C22C21/04
Inventor 芦富敏王晨均倪海华焦熙印杨弋涛孙保良张恒华
Owner SHANGHAI HUIZHONG AUTOMOTIVE MFG
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