Heat treatment process of low-alloying Al-Mg-Si alloy

A low-alloy, aging heat treatment technology, applied in the direction of improving process efficiency, improving energy efficiency, etc., can solve the problems of free electron directional movement obstruction, increase in strength of difficult alloys, and underutilization, etc., to suppress the second phase coarsening. the effect of

Active Publication Date: 2018-11-23
福建祥鑫股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Mg2Si phase is composed of Mg and Si elements combined in a certain atomic ratio, but if the content of Mg and Si in the alloy is low, or not fully utilized, it will be difficult for the alloy to obtain sufficient strength increment by heat treatment
The excellent electrical and thermal conductivity of this series of alloys is achieved by the movement of free electrons. When the Mg2Si strengthening phase in the alloy forms a coherent or semi-coherent structure with the matrix, the alloy can obtain high strength properties, but these strengthening phases cause The lattice distortion region of the alloy significantly hinders the directional movement of free electrons, so the electrical conductivity and thermal conductivity of the alloy are low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Extrusion: processing and forming by conventional forward hot extrusion method, controlling the heating temperature and extrusion speed of the billet, so that the alloy temperature of the extrusion die is 530~560°C, preferably, the alloy of the extrusion die The temperature is 530°C, 535°C, 540°C, the best is 545°C;

[0027] (2) Quenching: On-line quenching treatment is carried out by adopting a graded cooling method, that is, the extrusion speed and cooling system are controlled, so that the extruded alloy semi-finished product first travels in the air cooling zone for 5~10s, and then the alloy enters the strong wind rapid cooling zone, and the travel time is 20 ~40s, preferably, the travel time is 30s, and the cooling rate is 6~10°C / s; the alloy is cooled to below 250°C by strong wind quenching, and then air-cooled to room temperature;

[0028] (3) Aging: Two-stage artificial aging treatment is adopted, that is, after straightening and cutting the alloy semi-finis...

Embodiment 2

[0035] (1) Extrusion: processing and forming by conventional forward hot extrusion method, controlling the heating temperature and extrusion speed of the billet, so that the alloy temperature of the extrusion die is 540~555°C;

[0036] Preferably, the alloy temperature at the extrusion die is 540°C, 545°C;

[0037] Optimally, the alloy temperature at the extrusion die is 545°C.

[0038] (2) Quenching: On-line quenching treatment is carried out by adopting a graded cooling method, that is, controlling the extrusion speed and cooling system, so that the extruded alloy semi-finished product first travels in the air cooling zone for 5~10s, and then the alloy enters the strong wind rapid cooling zone, and the travel time is 25 ~35s, can be 25s, 30s, 35s; the cooling rate is 8~10℃ / s; the alloy is cooled to below 250℃ by strong wind quenching, and then air cooled to room temperature;

[0039] Preferably, the extruded alloy semi-finished product first travels in the air cooling zone ...

Embodiment 3

[0047] (1) Extrusion: processing and forming by conventional forward hot extrusion method, controlling the heating temperature and extrusion speed of the billet, so that the alloy temperature of the extrusion die is 550°C;

[0048] (2) Quenching: On-line quenching treatment is carried out by adopting a graded cooling method, that is, the extrusion speed and cooling system are controlled, so that the extruded alloy semi-finished product first travels in the air cooling zone for 5~10s, and then the alloy enters the strong wind rapid cooling zone, and the travel time is 30s , the cooling rate is 6~10°C / s; the alloy is cooled to below 250°C by strong wind quenching, and then air-cooled to room temperature;

[0049] (3) Aging: Two-stage artificial aging treatment is adopted, that is, after straightening and cutting the alloy semi-finished products that have been quenched online, they are placed in a resistance furnace that has been heated to 230°C for primary aging heat treatment, a...

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Abstract

The invention belongs to the technical field of nonferrous metal material manufacturing, and particularly relates to a heat treatment process of a low-alloying Al-Mg-Si alloy. The process is aimed atthe phenomenon that the low-alloying Al-Mg-Si alloy is used for extruding a product, the special heat treatment systems of high-temperature extrusion, three-level online quenching cooling and dual-stage aging high firstly and low at the later period are adopted, and the alloy obtains mechanical property and electrical property good matching. The heat treatment process is adopted, the low-alloyingAl-Mg-Si alloy can obtain the property matching with the tensile strength being 150 MPa, the elongation being 14%, and the specific conductance being 59% IACS or above, or the tensile strength being 180 MPa, the elongation being 12%, and the specific conductance being 57% IACS or above, and through the process, the application of the Al-Mg-Si alloy to the power industry is effectively promoted.

Description

technical field [0001] The invention belongs to the technical field of manufacturing non-ferrous metal materials, and in particular relates to a heat treatment process of a low-alloyed Al-Mg-Si alloy. Background technique [0002] The 6××× series Al-Mg-Si alloy is a typical lightweight and medium-strength aluminum alloy structural material, and its extrusion products are widely used in many fields. Low-alloyed Al-Mg-Si alloys mainly refer to aluminum alloys such as 6063, 6060, 6101, etc., with the total mass fraction of Mg and Si elements less than 1%. This type of alloy has high plasticity, good electrical and thermal conductivity and corrosion resistance Performance, as well as excellent forming performance, can realize high-speed extrusion, thin-walled complex structure and high extrusion ratio molding, but its strength performance is usually low, which limits its application range. [0003] In general, the strength and plasticity of aluminum alloys always have contradic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/05
CPCC22F1/002C22F1/05Y02P10/25
Inventor 黄铁明张建雷冯永平
Owner 福建祥鑫股份有限公司
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