Experimental method and device for measuring high-temperature solidification phase transition law

Abstract

The invention relates to an experimental method and device for determining high temperature solidification phase transition rule, and belongs to detection instruments and meters. According to the invention, the solidification property of metal and alloy is determined at on-site cooling rate under a high-temperature condition so as to simulate real on-site working conditions; A phase transition temperature point is obtained by simulation determination of the high temperature solidification phase transition rule SPT; the whole phase transition process is observed; quantitative analysis of the phase transition is carried out; the phase transition rule is verified; and the transition rule is determined. According to the invention, a DTA differential thermal analyzer is used to determine the solidification phase transition point, liquidus line and solidus point of metal and alloy materials at different cooling rates; The cooling rate and the quenching temperature are determined based on the DTA results; with the method and device of the invention, a sample is melted and cooled to different quenching temperatures, and quenching is carried out by liquid nitrogen alcohol; the sample tissue morphology after quenching is observed; the contents of the first-precipitated phases in the high temperature tissue at different cooling rates are analyzed to obtain the high temperature solidification phase transition rule SPT of the sample; selection of an optimal solidification mode is realized at specific production requirements.

Description

technical field [0001] The invention relates to an experimental method and device for determining the law of solidification phase transition at high temperature, more specifically, it relates to a test method for measuring the law of solidification phase transition of metal and alloy materials, belonging to the field of detection instruments. Background technique [0002] In the solidification experiment of metal and alloy materials, it is necessary to analyze the phase transition used in the solidification process in the foundry industry and continuous casting industry. At present, the existing experimental methods for solidification phase transition measurement at home and abroad generally use laser confocal microscopy and DTA. Differential thermal analysis method, but the measured parameters are relatively scattered and do not form a systematic rule. The laser confocal microscope experiment method is to put the sample into the laser confocal equipment, and determine it by ...

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Problems solved by technology

[0005] (1) The structure of the sample contained in the laser confocal microscope and DTA differential thermal analyzer is small, and the experimental sample is very thin, which cannot simulate the field conditions

[0006] (2) The cooling rate of laser confocal microscope and DTA differential thermal analyzer is unstable and small, so it is impossible to simulate the cooling process in on-site continuous casting and casting

[0007] (3) The DTA differential thermal analyzer can only display the results of the solidification phase transition point of the material but cannot observe and quantitatively analyze the structural changes during the solidification process

[0008] In order to solve the problem that the conventional high-temperature solidification phase transition law determination experimental method cannot simulate the actual working conditions on site, the present invention designs an experimental device for high-temperature solidification phase transition law determination, and forms a new experimental method suitable for high-temperature solidification phase transition law determination. can solve the above problems well

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