Method for testing TTT (Time,Temperature,Transformation) curve
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A technology of curves and test fluids, applied in the direction of investigation phase/state change, etc.
Inactive Publication Date: 2013-02-06
SHANGHAI UNIV
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The applicant of the present invention uses the Flash DSC+TTT curve (Flash differential scanning calorimetry + TTT diagram) as the key word. American "Engineering Abstracts Index" (EI), Sciencedirect scientific paper database, ISI Web of Science and other foreign scientific and technological databases, my country's " China Journal Network and VIP Chinese Periodicals Database and other scientific and technological literature indexes have not found complete relevant literature
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Embodiment 1
[0031] 1. Use a blade to scrape an appropriate amount of powder from the amorphous rod;
[0032] 2. Select the appropriate sensor according to actual needs. The sensor model used here is XI 400. Use a soft thin copper wire to dip a small amount of silicone oil and apply it to the test area of the sensor to increase the thermal contact area;
[0033] 3. Under the optical microscope, select a micron-sized sample and place it precisely in the center of the sensor test area;
[0034] 4. Heat the material to melt on Flash DSC 1, and confirm that its melting point is 365.7°C and its liquidus temperature is 440°C;
[0035] 5. Take another particle of similar size and repeat step 3, heat to 450°C and keep it warm for 0.5s to make the temperature and composition uniform;
[0036] 6. Rapidly cool down the liquid droplets at a rate of 4,000K / s to 405°C and keep warm. When the isotherm curve shows an exothermic peak, it is the starting point of nucleation, and the incubation period is ...
Embodiment 2
[0040] 1. Use a blade to scrape an appropriate amount of powder from the block Sn;
[0041] 2. Select the appropriate sensor according to actual needs. The sensor model used here is XI 400. Use a soft thin copper wire to dip a small amount of silicone oil and apply it to the test area of the sensor to increase the thermal contact area;
[0042] 3. Under the optical microscope, select a micron-sized sample and place it precisely in the center of the sensor test area;
[0043] 4. Heat the material to melt on Flash DSC 1, and determine its melting point to be 232°C;
[0044] 5. Take another particle of similar size and repeat step 3, heat to 350°C and hold for 0.5s to make the temperature uniform;
[0045] 6. Rapidly cool down the liquid droplets at a rate of 4,000K / s to 160°C and keep warm. When the isotherm curve shows an exothermic peak, it is the starting point of nucleation, and the incubation period is determined to be 85.8s by tangential extrapolation;
[0046] 7. Sele...
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Abstract
The invention provides a method for obtaining a liquid-solid conversion TTT curve. The method is characterized by being suitable for the material of which a melting point is below 450 DEG. C and an induction period is less than 10-3s. A used test sample is either a single particle with size of 1 to 50microns or a film with thickness of 1 to 10microns, the used sample is placed in a testing region of a sensor under an optical microscope, and a metallographic microscope is utilized for determining the size of the test sample; an actual melting point of the test sample is determined by a flash scanning calorimeter; the material is heated to be in a liquid state completely and insulated for a proper time, and then the liquid state test sample is quickly cooled to the melting point and then is insulated at the certain temperature, and the induction period is obtained; an isothermic nucleation step is repeated to obtain the induction periods under the different temperatures; and the induction periods are marked by the time t as a horizontal ordinate and the temperatures T as the vertical coordinate and are fitted by the smooth curves, so that the TTT curve of the material is obtained. According to the method, the speed is fast, the efficiency is high, the shortages of the traditional DSC (differential scanning calorimetry) and DTA (differential thermal analysis) process can be effectively overcome, and the application range of the thermoanalysis is broadened.
Description
technical field [0001] The invention relates to a new method for measuring the liquid-solid isothermal transition curve (Temperature-Time-Transformation, TTT) of a material, which belongs to the field of metal material solidification. Background technique [0002] Solidification is an important means of preparing materials, especially metal materials. The solidification of crystal materials includes two processes of nucleation and growth. Among them, nucleation is the initial stage of crystallization and plays a decisive role in the final properties of materials. There are two types of nucleation methods: uniform nucleation and non-uniform nucleation. Since the basic principle of non-uniform nucleation is based on uniform nucleation, uniform nucleation is mainly used as an example to introduce its background. [0003] According to the classical solidification theory, supercooling is a necessary condition for metal solidification. There are a lot of structural fluctuations ...
Claims
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Application Information
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