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Thermal analysis and detection method and device for solidification grain size of magnesium alloy melt

A detection method and grain size technology, applied in the direction of measuring devices, particle size analysis, material thermal analysis, etc., can solve the problems of small amplitude, small solidification latent heat, low sensitivity of solidification grain size, etc., and achieve timely metamorphism and accurate results , Reduce the effect of equipment errors and human factors

Active Publication Date: 2013-03-27
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

However, since the latent heat of solidification of magnesium is small (8.954kJ / mol), which is lower than that of aluminum (10.790kJ / mol) and iron (13.80kJ / mol), under the solidification conditions of general casting, there is less regrowth in the early stage of solidification. , even if it occurs, the amplitude is very small, and the sensitivity of real-time monitoring of the metamorphic effect of the melt and the size of solidified grains at the casting site is low

Method used

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  • Thermal analysis and detection method and device for solidification grain size of magnesium alloy melt
  • Thermal analysis and detection method and device for solidification grain size of magnesium alloy melt
  • Thermal analysis and detection method and device for solidification grain size of magnesium alloy melt

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Embodiment 1

[0074] The effect of alloying element Ca on the grain size of AM50 alloy was examined. The basic operation steps are as follows:

[0075] I) Smelting process:

[0076] Smelt magnesium alloys according to the normal smelting process, use a 10kg resistance crucible boiler to smelt AM50 alloys and alloys with 2wt.% Ca added, hold at 750°C for 15 minutes, and pour at 720°C;

[0077] II) Thermal analysis process:

[0078] Before alloy pouring, pour 2 / 3 volume of magnesium alloy liquid into the sampling cup preheated to 700°C at 720°C, and cool the sampling cup naturally 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 Φ40mm in diameter, 60mm 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 (RJ-2, etc.) for magnesium alloy smelting, and the temperature of...

Embodiment 2

[0084] AZ91 alloy modification treatment, the basic operation steps are as follows:

[0085] I), smelting process:

[0086] According to the normal smelting process, the magnesium alloy is smelted, the AZ91 magnesium alloy is smelted with a 10kg resistance crucible boiler, and the magnesite is modified at 720°C; the temperature is kept at 750°C for 15 minutes, and the casting is performed at 720°C;

[0087] II), thermal analysis process:

[0088] Before alloy pouring, pour 2 / 3 volume of magnesium alloy liquid into the sampling cup preheated to 700°C at 720°C, and cool the sampling cup naturally 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 Φ40mm in diameter, 60mm 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 (RJ-2, etc.) for magnesium alloy sme...

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Abstract

The invention provides a thermal analysis and detection method and device for solidification grain size of a magnesium alloy melt and belongs to the fields of magnesium alloy melt treatment and casting solidification. The thermal analysis and detection method provided by the invention comprises that certain amounts of magnesium and magnesium alloy melt are poured into a sampling cup to be cooled, two thermocouples are adopted for respectively determining temperatures at the center and the edge of the melt in a solidification process in a magnesium alloy melt cooling process, a temperature acquisition device is used for acquiring temperature data, a computer program is used for recording variation of the temperatures at the center and the edge of the melt in the solidification process along with time, then dendritic crystal coherence point solid phase fractional number is determined by virtue of a thermal analysis and detection method, and the dendritic crystal coherence point solid phase fractional number is compared with a standard value to judge a refining or roughening effect on the grain size of a magnesium alloy by modification, grain refining or alloying element addition. According to the thermal analysis and detection method and device provided by the invention, recalescence is not required in a thermal analysis cooling curve of the solidification process, the thermal analysis and detection method and device provided by the invention are especially applicable to the magnesium alloy with lower solidification latent heat release, a modification effect can be represented within a wider solidification speed range, and solidification grain size can be predicted.

Description

technical field [0001] The invention belongs to the field of magnesium alloy melt processing and casting solidification, and in particular relates to a thermal analysis detection method and device for the solidification grain size of magnesium alloy melt. The detection method and device are used to determine the influence of on-site melt treatment (including modification, inoculation treatment, and addition of trace alloy elements, etc.) on the grain size of the solidification structure of magnesium alloy casting, and realize the Prediction of grain size and properties of alloys after solidification. Background technique [0002] Energy saving and environmental protection have become two core issues in today's world. 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, and recyclab...

Claims

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Application Information

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IPC IPC(8): G01N25/00G01N15/02
Inventor 陈荣石梁松茂马跃群韩恩厚柯伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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