Iron-rich phase modifier as well as preparation method and modification method thereof

A modification agent and iron-rich technology, which is applied in the field of iron-rich phase modification, can solve the problems that the needle-shaped iron-rich phase cannot be eliminated, the volume fraction of the iron-rich phase is increased, and the amount of addition is not recognized, so as to achieve the refinement of the iron-rich phase, The effect of reducing impurity elements and reducing the content of additives

Active Publication Date: 2018-12-14
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the element neutralization method and melting casting method are mainly used at home and abroad to change the morphology distribution of the iron-rich phase. Commonly added elements include Mn, Cr, RE, Sr, Be, Sc, etc., among which Mn element is the most commonly used, but the addition of Mn The amount has not been recognized, if it is too small, the acicular iron-rich phase cannot be eliminated, and if it is too much, it will not only form a coarse primary iron-rich phase, but also increase the volume fraction of the iron-rich phase, which is not good for the improvement of alloy plasticity

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  • Iron-rich phase modifier as well as preparation method and modification method thereof
  • Iron-rich phase modifier as well as preparation method and modification method thereof

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preparation example Construction

[0022] The embodiment of the present invention provides a preparation method of the above-mentioned iron-rich phase modifier, including:

[0023] Put the Al alloy, Al-Si alloy, Al-Fe alloy and Al-Mn alloy in the aluminum alloy melting furnace according to the ratio, and raise the temperature to 800-900°C. Then after all the alloys are melted, the temperature is lowered to 720-750°C, and the Al-B master alloy prepared and wrapped with aluminum foil is pressed into the aluminum melt with a titanium tool.

[0024] After the Al-B intermediate alloy is completely melted, the melt is degassed and impurity-removed, and after 10 to 30 minutes of heat preservation, the slag is removed and cast into a round ingot to obtain a high volume fraction of Al(MnFe)Si4. Elemental alloys are modifiers.

[0025] The above-prepared ingot wagon is cut into sections, subjected to homogenization treatment at 500-550° C., and then hot-extruded to prepare an alloy rod with a diameter of 9.5 mm.

[002...

Embodiment 1

[0032] This embodiment provides an iron-rich phase modifier, which is mainly prepared through the following steps:

[0033] The alloy composition is configured according to weight percentage, including: Si 7.0%, Fe 2.5%, Mn 0.7%, B 0.05%, and the balance of Al.

[0034] Preparation of modifier: first, place the prepared 4 raw materials such as Al, Al-Si, Al-Mn, and Al-Fe in an aluminum alloy melting furnace, and raise the temperature to 800°C; then cool down to 720°C after all the alloys are melted. ℃, use a titanium tool to press the Al-B master alloy that has been prepared and wrapped with aluminum foil into the aluminum melt; after the Al-B master alloy is completely melted, degas and remove impurities from the melt, keep it warm and let it stand After 20 minutes, the slag was removed and poured into a round ingot.

[0035] Preparation of modificator: cut the cylindrical ingot car body prepared above into sections, and perform hot extrusion processing after homogenization ...

Embodiment 2

[0037] This embodiment provides an iron-rich phase modifier, which is mainly prepared through the following steps:

[0038] The alloy composition is configured according to weight percentage, including: Si 5.0%, Fe 3.5%, Mn 1.1%, B 0.06%, and the balance of Al.

[0039] Modification agent preparation: first place the prepared Al, Al-Si, Al-Mn, Al-Fe and other four raw materials in the aluminum alloy melting furnace, raise the temperature to 850°C; then cool down to 730°C after all the alloys are melted ℃, use a titanium tool to press the Al-B master alloy that has been prepared and wrapped with aluminum foil into the aluminum melt; after the Al-B master alloy is completely melted, degas and remove impurities from the melt, keep it warm and let it stand After 30 minutes, the slag was removed and poured into a round ingot.

[0040] Preparation of the modificator: Cut the cylindrical ingot car body prepared above into sections, and perform hot extrusion processing after homogeni...

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Abstract

The invention relates to the technical field of iron-rich phase modification. An iron-rich phase modifier comprises the following components by mass: 4.5-7.0% of Si, 2.5-5.0% of Fe, 0.7-1.4% of Mn, 0.03-0.1% of B, 0-0.15% of impurity elements and the balance of Al, wherein a preparation method of the iron-rich phase modifier comprises the following steps: placing Al, Al-Si, Al-Fe and Al-Mn in a melting furnace at a proportion for melting, then adding an Al-B intermediate alloy, and pouring the melt to form round ingots after degassing, impurity removal, heat preservation and standing, and slagging; the ingots are thermally extruded and processed to prepare an alloy rod after turning, sectioning and homogenizing treatment; and a modification method comprises the following steps: melting aniron-containing aluminum alloy, then adding the modifier, stirring, and then refining, standing, slagging and pouring to form ingots or performing production. According to the invention, a modification process is simplified, the impurity elements are reduced, and the dosage of the modifier is reduced.

Description

technical field [0001] The invention relates to the technical field of iron-rich phase modification, and in particular to an iron-rich phase modification agent, a preparation method and a modification method thereof. Background technique [0002] Iron is the most common impurity element in aluminum alloys. Since iron is almost insoluble in aluminum solids at room temperature, iron exists in the form of iron-rich phases in both aluminum and aluminum alloys. Since the iron-rich phase is an intermetallic compound, its hardness can reach more than 660HV, far exceeding that of the aluminum matrix. At the same time, the brittle cracking tendency of the iron-rich phase is also obvious. When it is stressed, it is easy to crack inside it and become a crack source, and it expands along the length of the iron-rich phase. This has a great influence on the plasticity of aluminum alloys, especially the coarse The acicular iron-rich phase, that is, the β-Fe phase. In addition to the need...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C21/02C22C1/03
CPCC22C1/026C22C1/03C22C1/06C22C21/02
Inventor 宋东福王顺成周楠杨莉黄正华郑开宏
Owner GUANGDONG INST OF NEW MATERIALS
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