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Experimental method for measuring harden ability of large-sized aluminium alloy
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A test method and technology of aluminum alloy, which is applied in the direction of testing material hardness, preparation of test samples, measuring devices, etc., can solve the problems of organizational structure, performance parameter error, harsh quenching process conditions, and inconsistent cooling conditions, etc. High effect accuracy, improve comprehensive mechanical properties, and ensure consistent effect
Inactive Publication Date: 2011-08-17
HUNAN UNIV
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However, all of the small-sized end-quenched samples (usually Φ10mm round bars) are used, and there are errors between the microstructure and performance parameters obtained after heat treatment and the actual conditions of large-sized aluminum alloy workpieces; in addition, the above-mentioned end-quenched Both methods require special quenching equipment, and the quenching process conditions are harsh. It is impossible to implement process tracking for the actual heat treatment and quenching production process. It is a simulated quenching process method; The cooling conditions do not match the actual quenching process conditions, and thus cause other errors
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Embodiment 1
[0036] The first step: aluminum alloy test piece preparation
[0037] (1) Homogenization treatment
[0038] 7150 aluminum alloy is taken, the homogenization process system is: 420°C / 12h+465°C / 24h, electric heating in a 320KW trolley-type resistance furnace, with a hot air circulation system, and air cooling to room temperature after the treatment is completed;
[0039] (2) Face milling, hot rolling
[0040] After the homogenization treatment, 10mm is milled off both sides and two surfaces of the ingot to remove casting defects such as cracks on the surface layer of the ingot;
[0041] The ingot after face milling is heated and rolled into 10-40mm aluminum alloy ladder-shaped rectangular test piece with 4 steps.
[0042] Equipment: The ingot heating furnace is a 280KW trolley-type electric resistance furnace, with a hot air circulation system;
[0043] On a φ550x1450mm two-roll reversing hot rolling mill, hot rolling at a rolling speed of 12M / min;
[0044] Control the height ...
Embodiment 2
[0058] The first step: aluminum alloy test piece preparation
[0059] (1) Homogenization treatment
[0060] Identical with the technique of embodiment 1;
[0061] (2) Face milling, hot rolling
[0062] After the homogenization treatment, 10mm is milled off both sides and two surfaces of the ingot to remove casting defects such as cracks on the surface layer of the ingot;
[0063] Heating and rolling the ingot after face milling into 10-40mm different diameter aluminum alloy circular ladder-shaped specimens with 4 steps. ;
[0064] Equipment: The ingot heating furnace is a 280KW trolley-type electric resistance furnace, with a hot air circulation system;
[0065] On a φ550x1450mm two-roll reversing hot rolling mill, hot rolling at a rolling speed of 12M / min;
[0066] Control the height of each step to be greater than 2 times of its corresponding thickness, and the height of both ends of the step is greater than 5 times of its diameter, that is, L1=50mm, D1=10mm; L2=40mm, D...
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Abstract
The invention provides an experimental method for measuring harden ability of large-sized aluminiumalloy. The method uses step-shaped aluminiumalloy test-piece with a round or rectangle cross section and provides each step with a temperature thermocouple in the centre. Conducting heat treatment to the step-shaped aluminiumalloy test-piece to obtain the changing curve of temperature at thickness direction and cool-down time. Testing the hardness and analysing the tissue of the test-piece after quenching, and carrying out the mechanical property of the aluminium alloy test-piece after the quenching as well as fracture shape analysis. With the curve and data obtained as the basis, the method can optimize the quenching heat treatment mechanism and the timely heat treatment technology. The invention is simple in technology flow and easy in operation. The method can effectively ensure the conformity of the quenching technological conditions to the actual quenching condition of aluminium alloy test-pieces and reduce the error caused by end quenching treatment. The method is particularly applicable to large-sized pieces by various quenching treatment and widely applicable to labs and quenching permeability research of the industrial develop aspect.
Description
technical field [0001] The invention relates to a test method for measuring the hardenability of aluminum alloys, in particular to a test method for measuring the hardenability of large-sized aluminum alloys, and belongs to the technical field of metal heat treatment. Background technique [0002] The performance of the middle layer of large-section semi-finished high-strength aluminum alloy depends on its hardenability. The so-called hardenability refers to the ability of the alloy to achieve a certain depth of quenching effect, which is affected by factors such as alloy composition, quenching conditions, and size. Therefore, the study of the hardenability of aluminum alloys has important theoretical and practical significance for the development of new high-strength aluminum alloys and their heat treatment. The existing research on hardenability method is mainly based on a kind of end quenching treatment for quenched samples. Its characteristics are: the aluminum alloy rod...
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