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Solid-solution ageing technology for ultrahigh-strength 7-series aluminum alloy material for heavy-haul train traction rod

An aluminum alloy material, solution aging technology, applied in the field of metal materials, can solve the problems of slow production speed, complex process, high cost, etc., and achieve the effect of improving mechanical strength and hardness, simple preparation process, and strength improvement

Inactive Publication Date: 2018-06-29
SOUTHWEST ALUMINUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The design and development of the existing ultra-high-strength aluminum alloys began in the 1960s in China. Although ultra-high-strength aluminum alloys of 700 MPa have been developed in more than 50 years, most of them remain in the laboratory research stage, or use spray deposition. Small-batch trial production such as forming, either the process is complicated or the production speed is slow, and industrial production has never been realized. Although some studies have shown that adding precious metals or rare elements can obtain ultra-high-strength aluminum alloys, for daily civil and transportation, other The high cost is obviously not practical

Method used

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  • Solid-solution ageing technology for ultrahigh-strength 7-series aluminum alloy material for heavy-haul train traction rod
  • Solid-solution ageing technology for ultrahigh-strength 7-series aluminum alloy material for heavy-haul train traction rod
  • Solid-solution ageing technology for ultrahigh-strength 7-series aluminum alloy material for heavy-haul train traction rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] 7xxx alloy chemical composition: Si is 0.05%, Fe is 0.04%, Cu is 1.4%, Mn is 0.35%, Mg is 2.8%, Cr is 0.12%, Zn is 9.3%, Ti is 0.05%, single impurity ≤0.05% , the total impurity ≤ 0.15%, the balance is Al.

[0120] The ingot diameter is 162mm;

[0121] Homogenization of the ingot: the first level of soaking of the ingot, the heating temperature is 400 ° C, the holding time is 8 hours, and then the second level of soaking is carried out, the heating temperature is 465 ° C, the holding time is 24 hours, and the cooling method is air cooling .

[0122] Ingot wagon machining: After cutting the head and tail of the ingot, machine turning and milling to remove the surface defect layer.

[0123] The temperature of the casting rod is 420°C, the temperature of the extrusion cylinder is 430°C, the temperature of the mold is 430°C, the extrusion speed is 0.54m / min, the straightening deformation rate is about 1%, and the diameter of the finished extruded rod is

[0124] Soluti...

Embodiment 2

[0134] 7xxx alloy chemical composition: 0.02% Si, 0.10% Fe, 1.3% Cu, 0.01% Mn, 2.7% Mg, 0.16% Cr, 9.5% Zn, 0.058% Ti, single impurity ≤0.05% , the total impurity ≤ 0.15%, the balance is Al.

[0135] The ingot diameter is 385mm;

[0136] Homogenization of the ingot: the first level of soaking of the ingot, the heating temperature is 390 ° C, the holding time is 10 hours, and then the second level of soaking is carried out, the heating temperature is 468 ° C, the holding time is 24 hours, and the cooling method is air cooling .

[0137] Ingot wagon machining: After cutting the head and tail of the ingot, machine turning and milling to remove the surface defect layer.

[0138] The temperature of the casting rod is 430°C, the temperature of the extrusion cylinder is 425°C, the temperature of the mold is 430°C, the extrusion speed is 0.48m / min, the straightening deformation rate is about 1%, and the diameter of the finished pipe of the extruded rod is

[0139] Solution quenchi...

Embodiment 3

[0146] 7xxx alloy chemical composition: 0.05% Si, 0.085% Fe, 1.2% Cu, 0.54% Mn, 2.9% Mg, 0.13% Cr, 9.4% Zn, 0.06% Ti, single impurity ≤0.05% , the total impurity ≤ 0.15%, the balance is Al.

[0147] The ingot diameter is 590mm;

[0148] Homogenization of the ingot: the first level of soaking of the ingot, the heating temperature is 400 ° C, the holding time is 10 hours, and then the second level of soaking is carried out, the heating temperature is 470 ° C, the holding time is 24 hours, and the cooling method is air cooling .

[0149] Ingot wagon machining: After cutting the head and tail of the ingot, machine turning and milling to remove the surface defect layer.

[0150] The temperature of the casting rod is 430°C, the temperature of the extrusion cylinder is 420°C, the temperature of the mold is 430°C, the extrusion speed is 0.50m / min, the straightening deformation rate is about 1%, and the diameter of the finished pipe of the extruded rod is

[0151] Solution quenchi...

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Abstract

The invention provides a solid-solution ageing technology for an ultrahigh-strength 7xxx-series aluminum alloy material. The solid-solution ageing technology comprises the following steps: firstly, extruding an aluminum alloy casting ingot to prepare an extruded material; then carrying out solid-solution quenching on the extruded material obtained by the previous step and then placing; after carrying out manual ageing, obtaining the 7xxx-series aluminum alloy material. According to the solid-solution ageing technology provided by the invention, a specific solid-solution system is used for thealuminum alloy extruded material; the solid-solution quenching is firstly carried out; then the step of placing is carried out and the manual ageing is carried out; especially, after the solid-solution quenching is carried out on an aluminum alloy and the placing treatment is carried out so that the mechanical strength and rigidity of the alloy are improved; after the aluminum alloy material is subjected to the solid-solution quenching, a large part of compound phase is dissolved into an alloy matrix; then the specific manual ageing step is combined so that the strength of the aluminum alloy is remarkably improved. A preparation technology is simple and a production speed completely meets a normal production speed; the solid-solution ageing technology is low in cost and suitable for beingpopularized and applied in industrial large-scale production, and has important practical significance.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a solution aging process of an ultra-high-strength 7xxx series aluminum alloy material, in particular to a solution aging process of a low-cost ultra-high-strength 7xxx series aluminum alloy material used for heavy-duty train drawbars . Background technique [0002] Aluminum alloy is an alloy based on aluminum, the main alloying elements are copper, silicon, magnesium, zinc and manganese. Aluminum alloy is the most widely used non-ferrous metal structural material in industry. With the rapid development of the economy, aluminum alloy materials have been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industries, especially in recent years, with the global economic integration, the rapid development of logistics and transportation, and logistics and transportation have driven the vigorous development of the transportation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053C22C21/10
CPCC22C21/10C22F1/053
Inventor 林顺岩周志军温庆红姚勇林林
Owner SOUTHWEST ALUMINUM GRP
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