Thermal analysis test method and apparatus of magnesium and magnesium alloy deteriorative processing tissue thinning effect

A technology of deterioration treatment and detection method, applied in the direction of measuring device, material thermal analysis, analysis material, etc., can solve the problems of equipment error and human factors concealment, small improvement, small latent heat of solidification, etc., to achieve short detection period, High reliability and accurate results

Inactive Publication Date: 2008-11-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tch is the dendrite interference temperature, which can be accurately measured by the double thermocouple method. Theoretically, when the melt modification effect is good, the values ​​of Te and Tch should increase, but the increase is not large, and it is easy to be covered by equipment errors and human factors, and Ti , Te, Tch are temperature parameters, although the numerical accuracy is high, but it is greatly affected by the error of the thermocouple
ΔT is the apparent supercooling degree, that is, the difference between the supercooling temperature at the beginning of the solidification process and the maximum temper...

Method used

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  • Thermal analysis test method and apparatus of magnesium and magnesium alloy deteriorative processing tissue thinning effect
  • Thermal analysis test method and apparatus of magnesium and magnesium alloy deteriorative processing tissue thinning effect
  • Thermal analysis test method and apparatus of magnesium and magnesium alloy deteriorative processing tissue thinning effect

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Alloy grade AZ91, the basic operation steps are as follows:

[0057] I), smelting process:

[0058] Use 10kg resistance crucible boiler to smelt AZ91 magnesium alloy, 720℃ magnesite modification treatment;

[0059] II), thermal analysis process:

[0060] Before the alloy was poured, samples were taken directly from the melt with a sampling cup at 720 °C, and then the sampling cup was naturally cooled in air at a cooling rate of 0.5-1 °C / s. The material of the sampling cup is stainless steel, the space inside the sampling cup is Φ60mm in diameter at the top, Φ50mm in diameter at the bottom, 80mm in height, and the wall thickness of the sampling cup is 2mm. The sampling cup is preheated before sampling. The preheating method is to soak in the molten flux. The flux used is a special flux for magnesium alloy melting (such as: RJ-2, etc.), and the temperature of the flux is controlled at 700 ° C. The thermocouple is fixed at the center of the sampling cup, 40mm away from ...

Embodiment 2

[0065] The difference from Example 1 is:

[0066] Alloy grade AZ31, the basic operation steps are as follows:

[0067] I), smelting process:

[0068] Use 10kg resistance crucible boiler to smelt AZ31 magnesium alloy, 720℃ magnesite modification treatment;

[0069] II), thermal analysis process:

[0070] Before the alloy was poured, samples were taken directly from the melt with a sampling cup, and then the sampling cup was naturally cooled in the air at a cooling rate of 0.5-1 °C / s. The material of the sampling cup is stainless steel, the space inside the sampling cup is Φ60mm in diameter at the top, Φ50mm in diameter at the bottom, 80mm in height, and the wall thickness of the sampling cup is 2mm. The sampling cup is preheated before sampling. The preheating method is to soak in the molten flux. The flux used is a special flux for magnesium alloy melting (such as: RJ-2, etc.), and the temperature of the flux is controlled at 700 ° C. The thermocouple is fixed at the center ...

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Abstract

The invention relates to a thermal analysis testing method of magnesium and magnesium alloy deteriorate process organizing thinning effect, which specifically uses the correlation between the deteriorate effect and the characteristic parameter on the cooling rate curve when a fused mass is solidified, establishes a thermal analysis testing technique, and develops a corresponding thermal analysis apparatus based on the thermal analysis testing technique. The thermal analysis testing technique of the invention has the following steps: 1, establishing a thermal analysis cooling curve (T -t); 2, derivation to the cooling curve to obtain a cooling rate curve (dT/dt -t); 3, respectively calculating the recalescence exothermic peak areas of the fused mass fore and after the deterioration; 4, defining the deterioration degree to judge the deterioration effect. The thermal analysis process includes data capture, computer analysis of the cooling curve, quantization of the exothermic peak areas, and result comparison; the process is realized by the computer and data analysis software, which are configured to a computer aided thermal analysis detecting device. The thermal analysis testing method and testing apparatus of the invention can be used in the smelting field of magnesium and magnesium alloy, as a ladle analysis approach to control and improve the metallurgy quality.

Description

technical field [0001] The invention relates to a method for analyzing and controlling the melt quality of magnesium and magnesium alloys during the smelting process, specifically a thermal analysis detection method and device for the microstructure refinement effect of magnesium and magnesium alloy modification treatment. Performance characteristics, realize the control of alloy structure and performance. Background technique [0002] As a new type of metal material, magnesium alloy has been widely used in aerospace, automobile, 3C (computer, communication, consumer electronics) and other fields due to its advantages of low density, high specific strength and specific stiffness. Take the automobile industry as an example: On the one hand, automobile exhaust emissions account for about 65% of global air pollution; on the other hand, problems such as energy shortage and rising oil prices are becoming more and more serious. Car weight reduction is an effective measure to solv...

Claims

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Application Information

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IPC IPC(8): G01N25/14
Inventor 高磊陈荣石梁松茂马跃群韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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