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Composite alterant of cast aluminum alloy for iron-enriched phase alteration and alteration method thereof

A technology of casting aluminum alloy and compound modifier, which is applied in the field of casting aluminum alloy modification, can solve the problem that the refinement of eutectic silicon phase has no obvious effect and the like

Active Publication Date: 2019-03-19
GUANGDONG INST OF NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Song Dongfu【Song Dongfu, Zhou Nan, Xu Jing, et al. Effect of composite addition of Mn and B on iron-rich phase characteristics of aluminum-silicon alloy[J]. Rare Metal Materials and Engineering, 2016,45(8):2133-2138.】passed Adding Mn and B to iron-containing aluminum-silicon cast aluminum alloys can obtain fine and evenly distributed dendritic iron-rich phases, and at the same time promote the transformation of α-Al grains from dendrites to equiaxed crystals, iron-rich phases and α- The refinement and modification effect of Al is very significant, but it has no obvious effect on the refinement of eutectic silicon phase
Birol【Birol Y.Grain refinement and modification of Al–Si foundry alloys with B and Sr additions[J].MaterialsScience&Technology,2014,30(10):1154-1161.】confirmed that the compound addition of Sr and B in an appropriate amount can simultaneously achieve α -Refinement and modification of Al grains and eutectic silicon, but no modification of iron-rich phases involved

Method used

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  • Composite alterant of cast aluminum alloy for iron-enriched phase alteration and alteration method thereof
  • Composite alterant of cast aluminum alloy for iron-enriched phase alteration and alteration method thereof
  • Composite alterant of cast aluminum alloy for iron-enriched phase alteration and alteration method thereof

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Embodiment 1

[0042] This embodiment provides a method for modifying a cast aluminum alloy with iron-rich phase modification, which includes:

[0043] S1: Put the prepared ZL101 alloy raw material into the melting furnace, heat the raw material to 500°C, keep it for 30 minutes, and then raise the temperature to 750°C;

[0044] S2: After all the raw materials are melted, take a sample to test the Fe content in the melt, wrap the Mn agent with aluminum foil and add it to the aluminum melt, the added Mn agent content is 80% of the Fe content, and press it in with a titanium tool Inside the melt, stir the melt after melting.

[0045] S3: Transfer the melt to the refining and holding furnace, adjust the melt temperature to 700°C, conduct online refining on the recycled aluminum melt, remove gas and impurities, and add Al-Sr and Al-RE that have been preheated and wrapped in aluminum foil Alloys, Sr and RE are added in proportions of 0.03% and 0.1% of the melt, which are pressed into the melt wit...

Embodiment 2

[0049] This embodiment provides a method for modifying a cast aluminum alloy with iron-rich phase modification, which includes:

[0050] S1: Put the prepared ZL101 alloy raw material into the melting furnace, heat the raw material to 500°C, keep it warm for 30 minutes, and then raise the temperature to 760°C;

[0051] S2: After all the raw materials are melted, take a sample to test the Fe content in the melt, wrap the Mn agent with aluminum foil and add it to the aluminum melt. The added Mn agent content is 60% of the Fe content, and press it in with a titanium tool Inside the melt, stir the melt after melting.

[0052] S3: Transfer the melt to the refining and holding furnace, adjust the melt temperature to 710°C, conduct online refining on the aluminum melt, remove gas and impurities, and add Al-Sr and Al-RE master alloys that have been preheated and wrapped in aluminum foil , The addition ratio of Sr and RE is 0.02% and 0.2% of the melt, press it into the melt with a tita...

Embodiment 3

[0056] This embodiment provides a method for modifying a cast aluminum alloy with iron-rich phase modification, which includes:

[0057] S1: Put the prepared ZL111 alloy raw materials into the smelting furnace, heat the raw materials to 500°C, keep them warm for 30 minutes, and then raise the temperature to 790°C;

[0058] S2: After all the raw materials are melted, take a sample to test the Fe content in the melt, wrap the Mn agent with aluminum foil and add it to the aluminum melt. The content of the added Mn agent is 50% of the Fe content, and press it in with a titanium tool Inside the melt, stir the melt after melting.

[0059] S3: Transfer the melt to the refining and holding furnace, adjust the melt temperature to 710°C, conduct online refining on the aluminum melt, remove gas and impurities, and add Al-Sr and Al-RE master alloys that have been preheated and wrapped in aluminum foil , The addition ratio of Sr and RE is 0.03% and 0.06% of the melt, and it is pressed int...

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Abstract

The invention discloses a composite alterant of a cast aluminum alloy for iron-enriched phase alteration and an alteration method thereof, and relates to the field of composite alteration of the castaluminum alloy. The composite alterant comprises an Mn agent, an Al-RE intermediate alloy and an Al-Sr intermediate alloy, wherein the Mn agent is an Al-Mn intermediate alloy or a Mn additive; the adding ratio of the Mn agent is 30-90% of the Fe content in the cast aluminum alloy; the RE adding amount of the Al-RE intermediate alloy is 0.05-0.2% of the melt mass of the cast aluminum alloy; and theSr adding amount of the Al-Sr intermediate alloy is 0.02-0.05% of the melt mass. The composite alterant is specifically suitable for a high-strength and high-toughness cast aluminum silicon alloy with low Fe content and a die-cast aluminum silicon alloy with high iron content, and can achieve synchronous refining of three structures of alpha-Al, eutectic silicon and an iron-enriched phase to improve the alloy ductility.

Description

technical field [0001] The invention relates to the technical field of modification of cast aluminum alloys, and in particular to a composite modifier for cast aluminum alloys with iron-rich phase modification and a modification method thereof. Background technique [0002] Al-Si series cast aluminum alloy has the advantages of good casting performance, low shrinkage rate and thermal expansion coefficient, good weldability and corrosion resistance, etc., and is widely used in the fields of automobiles and motorcycles, aerospace, communications and electronic appliances. Fe is one of the most common impurity elements in cast aluminum alloys, and its content gradually increases with the increase of aluminum alloy cycle times. Because the solubility of Fe in aluminum alloy is very low, the formed iron-rich phase has the characteristics of high hardness and high brittleness. When the force is applied, internal cracking is easy to occur and become the source of cracks, which grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C21/04
CPCC22C1/06C22C21/04
Inventor 宋东福杨莉王顺成赵愈亮郑开宏张卫文韩军锋
Owner GUANGDONG INST OF NEW MATERIALS
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