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Refinement modifier for hypoeutectic aluminum-silicon cast alloy, and preparation method and application thereof

A casting alloy and hypoeutectic technology, which is applied in the field of refinement-modification agent for hypoeutectic aluminum-silicon casting alloy and its preparation and application, can solve mutual "poisoning, decline of refinement effect, and aggravation of alloy melt and other problems, to achieve the effect of accurate composition, easy preparation process and good refinement effect

Active Publication Date: 2018-06-01
JIANGXI ZHONGYAN METAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to solve the problem of titanium silicide poisoning Ti and B refinement effect in Al-5Ti-1B applied to hypoeutectic aluminum-silicon casting alloy, and 2 The problem of the decline of the refining effect caused by agglomeration; solve the problem of the modification agent Sr aggravating the gas absorption of the alloy melt and the mutual "poisoning" between Sr and the refining element B; realize the efficient refining and modification of the Al-Ti-B-RE master alloy Functional integration

Method used

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  • Refinement modifier for hypoeutectic aluminum-silicon cast alloy, and preparation method and application thereof
  • Refinement modifier for hypoeutectic aluminum-silicon cast alloy, and preparation method and application thereof
  • Refinement modifier for hypoeutectic aluminum-silicon cast alloy, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Preparation of refinement-modification agent Al-1Ti-3B-4RE (La-rich mixed light rare earth)-6Y.

[0034] (1) Using pure aluminum (Al), Al-4B master alloy (manufacturer: Jiangxi Yongte Alloy Company), pure titanium (sponge Ti), RE (La-rich mixed light rare earth), pure yttrium (Y) as raw materials, according to The target composition of the master alloy: Ti: 1%, B: 3%, La-rich mixed light rare earth 4%, Y: 6%, the balance Al, calculated considering the melting loss, weighing the required raw materials and drying them in a drying oven.

[0035] (2) Put pure aluminum (Al) and Al-4B master alloy into graphite crucible of intermediate frequency induction furnace, heat to 750-760°C, and cover a layer of cryolite covering agent on the melt surface; add sponge at 930-950°C Titanium particles are smelted at this temperature for 10-20 minutes to melt all the titanium, then add RE (La-rich mixed light rare earth) and pure yttrium (Y), and smelt again for 15-20 minutes t...

Embodiment 2

[0038] Example 2: The refinement-modifying agent Al-1Ti-3B-4RE (La-rich mixed light rare earth)-6Y of the present invention is applied to A356 alloy, which is realized through the following steps.

[0039] (1) Select raw materials of pure aluminum, Al-20Si master alloy, and pure magnesium, according to the composition of A356 alloy: Si: 7%, Mg: 0.3%, the total amount of impurities < 0.5, and the balance is Al.

[0040] (2) Use resistance furnace and graphite clay crucible for melting; after drying the prepared alloy raw materials of pure aluminum and aluminum-silicon alloy in a drying oven, put them into a preheated graphite clay crucible and heat and melt with the furnace; the melt temperature is 690-700 ℃, use a graphite bell jar preheated to 300 ℃ to press into pure magnesium.

[0041] (3) When the alloy melt temperature is 730-740°C, use a graphite bell jar preheated to 300°C to press into the aluminum foil-wrapped Cl 6 C 2 Carry out the first refining; after the slag is...

Embodiment 3

[0047] Example 3: The refinement-modifying agent Al-1Ti-3B-4RE (La-rich mixed light rare earth)-6Y of the present invention is applied to A357 alloy, which is realized through the following steps.

[0048] (1) Select raw materials of pure aluminum, pure magnesium, Al-20Si, Al-3Be, Al-10Mn master alloy, according to the optimized A357 alloy composition: Si: 6.8%, Mg: 0.6%, Be: 0.05%, Mn: 0.1%, Fe<0.1, the balance is Al.

[0049] (2) Use resistance furnace and graphite clay crucible for smelting; put the prepared alloy raw materials pure aluminum, Al-20Si, Al-10Mn, Al-3Be master alloy into the drying oven and dry, then put pure aluminum and Al-20Si into The preheated graphite clay crucible is heated and melted with the furnace; the melt temperature is 690-700°C, and the pure magnesium is pressed into the preheated graphite bell jar at 300°C; Al-10Mn and Al-3Be master alloys are added at 720°C.

[0050] (3) When the temperature of the alloy melt is 730-740°C, use a graphite bell...

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Abstract

The invention discloses a refinement modifier for hypoeutectic aluminum-silicon cast alloy, and a preparation method and the application thereof. The refinement modifier for hypoeutectic aluminum-silicon cast alloy is characterized by comprising the chemical ingredients of Al-1Ti-3B-10RE which are, by weight, 0.9% to 1.1% of Ti, 2.8% to 3.2% of B, 10% to 12% of RE, and the balance Al. The RE comprises the ingredients of 40% of mixed light rare earth rich in La, and 60% of Y. The problem of (Al and Ti)B2 and AlB2 agglomeration in a refinement modifier is solved due to the active roles of rare earth elements in cooperation with fusion magnetic blending and quick solidification. Compared with the widely used refinement modifier Al-5Ti-1B and the widely used refinement modifier Al-10Sr, the refinement modifier for hypoeutectic aluminum-silicon cast alloy has the function of integrating refinement and modification, and is easy to apply; andthe titanium silicide poisoning refinement effect or the phenomenon that air intake of alloy melt is intensified by Sr or the phenomenon that Sr and B poison each other does not exist, and the effect of refining alpha-Al and the mechanical property ofalloy can be obviously improved.

Description

technical field [0001] The invention relates to a refinement and modification integrated master alloy for a hypoeutectic aluminum-silicon casting alloy, as well as a preparation method and a refinement and modification treatment method thereof. Background technique [0002] Hypoeutectic Al-Si casting alloys are widely used in machinery, automobiles, aviation and other fields due to their good casting and mechanical properties. In the as-cast structure of the hypoeutectic Al-Si alloy without refinement and deterioration, the primary α-Al is in the form of coarse dendrites, and the eutectic Si is in the form of flakes, severely splitting the α-Al matrix, which greatly reduces the mechanical properties of the alloy. Therefore, Adding a certain amount of refinement modifier to the hypoeutectic Al-Si casting alloy melt can refine the primary α-Al grains and improve the eutectic Si morphology (modification), which is to improve the mechanical properties of the hypoeutectic Al-Si c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C32/00C22C1/03C22C1/10
CPCC22C1/03C22C1/1036C22C21/00C22C32/0073C22C1/1047
Inventor 章爱生解协成
Owner JIANGXI ZHONGYAN METAL TECH CO LTD
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