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
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[0073] Example 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] 1) Smelting process:
[0076] The magnesium alloy was smelted according to the normal smelting process, and the AM50 alloy and the alloy added with 2wt.% Ca were smelted using a 10kg resistance crucible boiler, kept at 750℃ for 15min, and poured at 720℃;
[0077] II) Thermal analysis process:
[0078] Before pouring the alloy, pour 2 / 3 volume of magnesium alloy liquid into the sampling cup preheated to 700 °C at 720 °C, and naturally cool the sampling cup in air at a cooling rate of 0.5-1 °C / s. The material of the sampling cup is stainless steel, the space size in 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 immersion in molten flux. The flux used is special flux for magnesium alloy smelt...
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[0083] Example 2
[0084] AZ91 alloy modification treatment, the basic operation steps are as follows:
[0085] 1), smelting process:
[0086] The magnesium alloy is smelted according to the normal smelting process, and the AZ91 magnesium alloy is smelted with a 10kg resistance crucible boiler, and the magnesite is metamorphic at 720°C;
[0087] II), thermal analysis process:
[0088] Before pouring the alloy, pour 2 / 3 volume of magnesium alloy liquid into the sampling cup preheated to 700 °C at 720 °C, and naturally cool the sampling cup in air at a cooling rate of 0.5-1 °C / s. The material of the sampling cup is stainless steel, the space size in 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 immersion in molten flux. The flux used is special flux for magnesium alloy smelting (RJ-2, etc.), and the temperature of the flux is controlled at 700°C....
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