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Experimental method and device for determining high temperature solidification phase transition rule

An experimental device and experimental method technology, applied in the direction of measuring device, investigation stage/state change, material analysis through optical means, etc., can solve the problems of low cooling rate, inability to simulate the cooling process, inability to observe and quantitatively analyze tissue changes, etc. , to achieve the effect of constant cooling rate and self-adaptive control of cooling rate

Inactive Publication Date: 2014-04-02
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[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

Method used

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  • Experimental method and device for determining high temperature solidification phase transition rule
  • Experimental method and device for determining high temperature solidification phase transition rule
  • Experimental method and device for determining high temperature solidification phase transition rule

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Experimental program
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Effect test

Embodiment 1

[0043] 1-corundum crucible; 2-sample; 3-circulating water cooling system; 4-liquid nitrogen alcohol container; 5-support rod; 6-sample temperature measurement thermocouple; 7-electromagnetic regulating valve; Bottle; 9-cooling gas Ar cylinder; 10-lifting system; 11-furnace body thermocouple; 12-platinum rhodium wire heating system; 13-gas outlet; 14-upper sealing furnace cover; 15-control system; 16-protection System; 17-computer; 18-furnace body; 19-water pump; support sleeve-20.

[0044] Figure 4When material A is cooled to 1479°C, 1475°C, 1460°C, 1450°C, 1440°C, 1430°C, 1420°C, 1410°C, 1400°C, 1390°C and 1380°C at a cooling rate of 0.33°C / s, the liquid Metallographic structure corroded by aqueous regia solution (nitric acid: hydrochloric acid = 1:3 mixed solution) after nitrogen alcohol quenching. Corresponding to a-k in the figure respectively.

[0045] Figure 5 When material A is cooled to 1500°C, 1450°C, 1440°C, 1430°C, 1400°C, 1380°C, 1375°C, 1370°C, 1365°C, 1360°...

Embodiment 2

[0055] 1-corundum crucible; 2-sample; 3-circulating water cooling system; 4-liquid nitrogen alcohol container; 6-sample temperature measurement thermocouple; 7-electromagnetic regulating valve; 8-protecting gas Ar cylinder; 9-cooling Ar gas cylinder; 11-furnace body thermocouple; 12-platinum rhodium wire heating system; 13-gas outlet; 14-upper sealing furnace cover; 15-control system; 16-protection system; 17-computer; 18-furnace body ; 19-water pump; Lower sealing furnace cover-21; Support-22.

[0056] Body of furnace 18 top of the present invention is provided with upper stave, and bottom is provided with lower stave, upper stave and lower stave are connected by pipeline, and pipeline and water tank are connected by water pump 19 to form circulating water cooling system 3. The furnace body 18 has a measuring hole for installing the furnace body thermocouple 11, and the inner wall of the furnace body 18 is provided with an insulating layer, and the furnace body 18 is provided...

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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 ...

Claims

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Application Information

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IPC IPC(8): G01N21/84G01N25/06
Inventor 王昊杰麻永林邢淑清李爱莲刘炳广许建飞刘丕亮
Owner INNER MONGOLIA UNIV OF SCI & TECH
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