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Method and device for measuring continuous cooling phase transformation points of aluminum alloy

A technology of aluminum alloy and transformation point, applied in the investigation stage/state change and other directions, can solve the problem of difficult measurement of transformation point of aluminum alloy, and achieve the effect of rich functions, convenient operation and large cooling rate

Inactive Publication Date: 2010-07-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defect that the phase transition point of aluminum alloy is difficult to measure, and provide a method and device for measuring the phase transition point of aluminum alloy during continuous cooling. The method and device are easy to implement, have high detection accuracy, and have a large measurement range

Method used

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  • Method and device for measuring continuous cooling phase transformation points of aluminum alloy
  • Method and device for measuring continuous cooling phase transformation points of aluminum alloy
  • Method and device for measuring continuous cooling phase transformation points of aluminum alloy

Examples

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Effect test

Embodiment 1

[0025] The dynamic voltage measuring system in the present invention includes a YD-28A type dynamic resistance strain gauge, an aluminum wire, and an IA-20 type high-precision constant current source. The data acquisition and processing system includes a computer and an A / D acquisition card. The main body of the heating / cooling system is a resistance furnace, equipped with a furnace body thermocouple 4 and a temperature controller, figure 2 A schematic diagram of the system structure is given. It can be seen that the sample is placed on the sample stage 2 of the resistance furnace, and the thermocouple wire 10 [the thermocouple wire is composed of two thermocouple wires with opposite magnetic properties, and is used to measure the temperature of the sample. temperature], and connected to a high-precision constant current source (with an accuracy of ±0.5, and a current range of 0-15A) through an aluminum wire 3, to ensure that the current of the sample to be tested is constant...

Embodiment 2

[0030] 01970 aluminum alloy, at the beginning of the test, quickly move the furnace to the distance where there is no temperature conduction to the sample, and completely air-cooled. Figure 5 Shown is the resistance (voltage)-temperature curve and the judged phase transition start and end points obtained at this cooling rate [the average cooling rate is 45.5°C / min] for 01970 aluminum alloy, and the average cooling rate is 45.5°C / min . In combination with Example 1, it can be seen that the present invention is applicable to different grades of aluminum alloys, and the obtained curves tend to be roughly the same, and the present invention has universality for measuring the phase transition points of different aluminum alloys.

Embodiment 3

[0032] 7A04 aluminum alloy, at the beginning of the test, quickly move the furnace to a distance where there is no temperature conduction to the sample, and at the same time cool the sample with the second gear of the air-conditioning fan with ice. Figure 6 Shown is the resistance (voltage)-temperature curve and the judged phase transition start and end points obtained at this cooling rate [the average cooling rate is 594.7°C / min] for 7A04 aluminum alloy, and the average cooling rate is 594.7°C / min . It can be seen that, compared with Example 1, the phase transition start point of the curve is lower, and there is no phase transition end point. For the same aluminum alloy, different phase transition points will be obtained at different cooling rates.

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Abstract

The invention provides a method and a device for measuring the continuous cooling phase transformation points of aluminum alloy. The method comprises the following steps of automatically collecting the data of resistance, temperature and time in real time by utilizing a computer, drawing a voltage-temperature curve or a resistance-temperature curve of an aluminum alloy sample according to the measured data, and then obtaining the cooling phase transformation points according to the drawn curve. The device comprises a heating insulation and cooling system, a dynamic voltage measuring system, a temperature measuring system, a signal amplifying and converting system and a data collecting and processing system which are sequentially connected. The device can be used for obtaining the curve of voltage changing along with the temperature in the continuous cooling process of a supersaturated solid solution, thereby judging the phase transformation points of the alloy. The invention has the advantages of wide cooling test range, high measuring precision, high speed and simple operation, and can carry out heating, insulation, cooling, and the voltage and temperature real-time measurement and collection on aluminum alloy materials.

Description

technical field [0001] The invention belongs to the technical field of material testing, and relates to a method and a device for measuring the continuous cooling phase transition point of an aluminum alloy. Background technique [0002] When metal materials are cooled after thermal processing and heat treatment, it is usually necessary to use the continuous cooling transition curve (CCT) as a theoretical basis to guide the formulation of the process, because it intuitively reflects the phase transition initiation and phase transition of continuous cooling consistent with the actual quenching and cooling process. End, phase variables, etc. information. But so far there are few reports on the CCT diagram of aluminum alloys. The main reason is that the phase transition point of aluminum alloys is difficult to measure. At present, the equipment for measuring the phase transition point of iron and steel materials is relatively mature, but for aluminum alloys, due to their small...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/12
Inventor 李红英赵延阔胡琳娜王晓峰唐宜
Owner CENT SOUTH UNIV
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