Method for testing rapid solidification behavior and solidification heat flow of metal material
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A metal material and behavioral technology, applied in the field of rapid prototyping of metal materials, can solve the problems of not being able to observe and test heat flow changes, and achieve the effects of low test cost, high accuracy, and convenient use
Inactive Publication Date: 2017-06-20
CENT SOUTH UNIV
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Although the above two patents have unique advantages in their respective tests, they cannot directly observe and test the change behavior and heat flow changes during the rapid solidification process of metal material droplets.
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example 1
[0055] Example 1: Taking the test of non-magnetic steel as an example, the specific steps of determination are as follows:
[0056] 1. Obtaining metal droplets
[0057] (1) Loading: Open the cover of the protective gas cover, put 5g of steel sample at the bottom of the quartz tube with a hole diameter of 0.5mm, and close the cover of the protective gas cover.
[0058] (2) Vacuuming: Use a vacuum pump to evacuate the entire device for 30 minutes, and fill it with protective gas, oxygen partial pressure: PO 2 =10 -18 , and eventually its pressure reaches one atmosphere.
[0059] (3) Melting metal: adjust the power controller, heat the steel sample at the bottom of the quartz tube through the induction coil, set the target temperature to 1550°C, measure the temperature of the steel sample in real time with a precision thermometer, and stop heating when the predetermined temperature is reached.
[0060] 2. Spray molten droplets and collect data
[0061] (1) Turn on the cooling...
example 2
[0067] Example 2: Taking the test of ferroalloy as an example, the specific steps of determination are as follows:
[0068] 1. Obtaining metal droplets
[0069] (1) Loading: Open the cover of the protective gas cover, put 8g of steel sample at the bottom of the quartz tube with a hole diameter of 0.7mm, and close the cover of the protective gas cover.
[0070] (2) Vacuuming: Use a vacuum pump to evacuate the entire device for 45 minutes, and fill it with protective gas. Oxygen partial pressure: PO 2 =10 -20 , and eventually its pressure reaches one atmosphere.
[0071] (3) Melting metal: adjust the power controller, heat the steel sample at the bottom of the quartz tube through the induction coil, set the target temperature to 1600°C, measure the temperature of the steel sample in real time with a precision thermometer, and stop heating when the predetermined temperature is reached.
[0072] 2. Spray molten droplets and collect data
[0073] (1) Turn on the cooling water: ...
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Abstract
The invention discloses a method for testing the rapid solidification behavior and the solidification heat flow of a metal material. A vacuum pump and a deep deoxygenation device are used for regulating and controlling protective atmosphere, an induction coil is used for heating and melting a metal material sample, inert protective gas is introduced into a quartz glass tube through a pulse air pressure controller, a metal molten drop is injected to the upper surface of a water cooling copper mould, the change pattern of a metal molten drop solidification process is captured through a high-speed pick-up device on site in real time, meanwhile, a temperature data acquisition device is synchronously started, the temperatures of two thermocouples embedded in the upper vertical position and the lower vertical position of the center of the cooling copper mould are collected and stored, the work of the high-speed pick-up device and the temperature acquisition device can be stopped after the metal molten drop is completely solidified, and then, the analysis and conversion calculation of collected information can be carried out so as to obtain an image which reflects the solidification behavior of the metal material and the change rule of the heat flow in a solidification process. The method has the advantages of convenience and simpleness in operation, good stability, low test cost, high detection efficiency, visual and intuitive result, high accuracy, wide applicable range and the like.
Description
technical field [0001] The invention relates to a method for testing rapid solidification behavior and solidification heat flow of metal materials, belonging to the technical field of rapid prototyping of metal materials. Background technique [0002] In the metallurgical industry, continuous casting technology has become common, especially for steelmaking, continuous casting is the dominant method of steelmaking. In order to improve production efficiency and obtain greater output, continuous The casting speed is required to be faster and faster, especially the twin-roll thin strip continuous casting technology, the casting speed is extremely high, and the casting slab is required to solidify the molten steel in a very short time, which is as short as 0.2s-0.5s , That is to say, molten steel needs to be solidified at an extremely fast cooling rate, which means that the heat flow per unit time is extremely high. The conduction of heat flow has an extremely important impact o...
Claims
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