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Thermal treatment method for lead-free aluminum alloy

A heat treatment method and aluminum alloy technology, which is applied in the field of heat treatment of lead-free aluminum alloys, can solve the problems of no lead-free aluminum alloy production and heat treatment process disclosure, and achieve excellent corrosion resistance and weldability, excellent mechanical properties, and strong The effect of industrial operability

Active Publication Date: 2010-05-19
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to make the properties of lead-free aluminum alloys reach or be equivalent to those of 2XXX or 6XXX series alloys, it is necessary to carry out appropriate heat treatment on this new alloy. At present, there are special heat treatment process parameters for mature application of lead-free aluminum alloys with special components In a state of confidentiality, there is no disclosure of the production and heat treatment process of industrialized lead-free aluminum alloys

Method used

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  • Thermal treatment method for lead-free aluminum alloy

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Embodiment 1

[0019] The extruded alloy is heat treated and then cold worked. The specific process flow is: heating up the heat treatment furnace to the set temperature (535±2°C)——furnace loading——solution treatment (heating 10°C / min—holding 60min)—quenching (quenching transfer time 5-10s)— - Aging treatment (to warm furnace, temperature rise 3 ℃ / min - heat preservation 10h) - out of the furnace air cooling.

Embodiment 2

[0021] The extruded alloy is heat treated and then cold worked. The specific process flow is: heating up the heat treatment furnace to the set temperature (535±2°C)——furnace loading——solution treatment (heating 10°C / min—holding 60min)—quenching (quenching transfer time 5-10s)— - Aging treatment (to warm furnace, temperature rise 3°C / min - heat preservation 10h) - Air cooling after leaving the furnace - Cold working (deformation amount 0.5%).

Embodiment 3

[0023] The extruded alloy is heat treated and then cold worked. The specific process flow is: heating up the heat treatment furnace to the set temperature (535±2°C)——furnace loading——solution treatment (heating 10°C / min—holding 60min)—quenching (quenching transfer time 5-10s)— - Aging treatment (to warm furnace, temperature rise 3 ℃ / min - heat preservation 10h) - out of the furnace air cooling - cold working (deformation 3.0%).

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Abstract

The invention provides a thermal treatment method for lead-free aluminum alloy, and relates to a thermal treatment method for wrought aluminum alloy which contains Sn, Bi and does not contain Pb. The lead-free aluminum alloy uses bismuth, tin, copper, silicon and chromium as alloy elements, and uses aluminum as substrate. The method is characterized by comprising the following steps: (1) carrying out solution heat treatment on an alloy ingot in a thermal treatment furnace at a temperature of 535+ / -2 DEG C for 60 minutes; (2) carrying out water quenching on the alloy ingot which is subjected to the solution heat treatment at room temperature; (3) carrying out aging treatment on the alloy ingot which is subjected to water quenching at the temperature of 165+ / -2 DEG C for 10 hours; and (4) air cooling the alloy to room temperature after the reactant is discharged and cooled, and carrying out cold machining (cold-drawing) with cold machining deflection of between 0 an 4 percent. The method can greatly improve the mechanical performance of the wrought alloy, and further improve the alloy strength through cold machining.

Description

technical field [0001] A heat treatment method for a lead-free aluminum alloy relates to a heat treatment method for a deformed aluminum alloy containing Sn and Bi but not containing Pb. Background technique [0002] As an alloying element of aluminum alloys, lead is mainly used in 2XXX and 6XXX series alloys to improve the machinability of the alloys. However, due to the problem of scrap return caused by lead pollution, some developed countries began to Leading aluminum companies have begun to study lead-free, easy-to-process aluminum alloys. Researchers have studied the use of other alloying elements to replace lead in aluminum alloys. These substitution elements include Si, Mn, Fe, and Ni. For example, Kaiser markets uses Sn to replace Pb in 6262, and designs its internal grade as KA62 alloy. Compared with 6262 alloy, the physical properties and processing properties of this alloy are B-level. Reynolds uses In and Sn to replace Pb and Bi in the 6262 alloy. These alloy el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C22F1/06C22C21/00C22C21/08
Inventor 姚素娟黄霞仓向辉
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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