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Preparation process of high-performance refined grain aluminum alloy wires and bars applied to aluminum bolts

A preparation process and aluminum alloy technology, which is applied in the field of preparation process of high-performance fine-grained aluminum alloy wire for aluminum bolts, can solve problems such as bolt corrosion failure, and achieve the effect of improving mechanical properties and refining grains

Active Publication Date: 2015-03-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More importantly, due to the difference in electrode potential between steel and aluminum, the bolt corrosion failure phenomenon caused by the potential difference is obvious

Method used

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  • Preparation process of high-performance refined grain aluminum alloy wires and bars applied to aluminum bolts
  • Preparation process of high-performance refined grain aluminum alloy wires and bars applied to aluminum bolts
  • Preparation process of high-performance refined grain aluminum alloy wires and bars applied to aluminum bolts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Raw materials such as pure Al, pure Mg, pure Zn, pure copper, AlSi master alloy, AlMn master alloy, AlZr master alloy and other raw materials were smelted into ingots in an inverting melting furnace. The chemical composition of the ingots is shown in Table 1.

[0031] Chemical composition of the alloy in table 1 (wt.%)

[0032] Si

Fe

Cu

mn

Mg

Cr

Zn

Ti

Zr

Al

1.08

0.09

0.46

0.53

0.65

0.02

0.18

0.02

0.06

Remain

[0033] The specific production process such as figure 1 , the actual operation steps are as follows:

[0034] (1) Carry out homogenization heat treatment to aluminum alloy ingot between 500~540 ℃, holding time 12~24h, air cooling (in this embodiment, homogenization temperature 520 ℃, time 12h);

[0035] (2) Extrude the cast ingot into a bar at 420-470°C, the extrusion ratio is 30.0-100.0, and air-cooled (in this embodiment, the extrusion temperature is 450°C, the cont...

Embodiment 2

[0045] Use pure Al, pure Mg, pure Zn, pure copper, AlSi master alloy, AlMn master alloy, AlZr master alloy and other raw materials for semi-continuous casting, the size of the crystallizer is Φ100mm, the casting speed is 10mm / min, the chemical composition of the ingot is shown in the table 3.

[0046] Chemical composition of the alloy in table 3 (wt.%)

[0047] Si

[0048] Specific steps are as follows:

[0049] (1) Carry out homogenization heat treatment to aluminum alloy ingot between 500~540 ℃, holding time 12~24h, air cooling (in this embodiment, homogenization temperature 530 ℃, time 18h);

[0050](2) Extrude the cast ingot into rods between 420 and 470°C, with an extrusion ratio of 30.0 to 100.0, and air cooling (in this embodiment, the extrusion temperature is 430°C, and the continuous extrusion outlet size is Φ10mm (2 branch), the extrusion ratio is 50);

[0051] (3) Carry out solid solution treatment to the rod, the treatment system is 520-540°C, heat pre...

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Abstract

The invention relates to the field f manufacture of aluminum alloy fasteners and in particular relates to a preparation process of high-performance refined grain aluminum alloy wires and bars applied to aluminum bolts. The preparation process is characterized by introducing a continuous extrusion process based on component optimization design to refine grains, carrying out solution treatment and aging treatment to prepare high-performance refined grain aluminum alloy wires and bars. The grain size of the aluminum alloy wires and bars produced by the process can reach about 30 microns; the corresponding yield strength can reach over 350MPa; the tensile strength can reach over 400MPa; the extension rate can reach over 10%. The material can be mainly used for manufacturing high-performance aluminum alloy bolts on the basis of the performance; meanwhile, the material can also be used for manufacturing other aluminum alloy connection part products such as high-strength rivets, high-strength connection belts and the like.

Description

technical field [0001] The invention relates to the field of manufacturing aluminum alloy fasteners, in particular to a preparation process for high-performance fine-grained aluminum alloy wire (rod) materials for aluminum bolts. Background technique [0002] In recent years, with the development of lightweight and high-strength aluminum alloys, its application range is also expanding. In the application process of aluminum alloy, connection problems are often involved. In addition to welding, riveting and other connection methods, the most common connection and fastening is the use of high-strength bolts. However, the current general bolts are all prepared from steel materials. Due to the large difference in expansion coefficient between steel and aluminum, when steel bolts are applied to aluminum alloy parts with large temperature differences (such as: new-type cast aluminum engines for automobiles), they are very easy to cause loosening and then fail. More importantly, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C22F1/043C22F1/047C22F1/05C22F1/057C22C21/00C22C21/02C22C21/08C22C21/16
Inventor 姜海昌闫德胜戎利建赵明久胡小锋宋元元陈胜虎
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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