Testing method for auxiliary cooling of thermal simulation test machine

A technology for auxiliary cooling and test methods, applied in heating or cooling equipment, chemical instruments and methods, laboratory utensils, etc., to achieve the effect of satisfying efficiency

Inactive Publication Date: 2018-06-01
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: how to solve the problem that the existing thermal simulation testing machine cannot complete continuous cooling from the austenitizing temperature to room temperature at a constant cooling rate greater than 15°C / s to measure M s Point and M f point of question

Method used

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  • Testing method for auxiliary cooling of thermal simulation test machine

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Embodiment approach

[0024] The implementation method proceeds as follows:

[0025] Process the axle steel EA1N into a dumbbell-shaped round bar with a total length of 75mm (the length of the left and right ends is 34.5mm, and the diameter is Φ10mm; the length of the uniform temperature zone is 6mm, and the diameter is Φ6mm);

[0026] Put two high-temperature ceramic tubes with an inner diameter of 0.3mm on the red and yellow thermocouples of the K-type thermocouple respectively to block the contact between the exposed part of the thermocouple wire and the surrounding metal, and then weld the K-type thermocouples separately by a spot welding machine In the center of the uniform temperature zone of the sample, it is arranged in a radial isothermal surface, and high-temperature cement is applied to the root of the solder joint to strengthen the solder joint.

[0027] Start the Gleeble3800 thermal simulation testing machine, put the dumbbell-shaped round bar sample welded with the thermocouple into t...

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Abstract

The invention relates to a testing method for auxiliary cooling of a thermal simulation test machine, belonging to the field of physical simulation of hot working of metal materials. The testing method comprises the following steps: treating a sample, sleeving the exposed protruding part of a thermocouple with a high-temperature ceramic tube, then welding the positive and negative electrodes of the thermocouple at the central part of a uniform temperature region of the sample by using a spot welder, wherein two welding spots are arranged along a radial isothermal surface at an interval of 1 mm, and then smearing high-temperature cement onto the two welding spots to reinforce the welding spots; installing an auxiliary cooling device in a vacuum chamber of the thermal simulation test machine; starting a control program of the thermal simulation test machine and modifying the control program of the thermal simulation test machine; and opening the vacuum chamber of the thermal simulation test machine, inserting the two ends of the sample into a copper fixture of the thermal simulation test machine tester, and testing the sample by using the modified control program of thermal simulation test machine.

Description

technical field [0001] The invention relates to the field of physical simulation of thermal processing of metal materials. Background technique [0002] Steel material is an alloy with phase transition, its high-temperature structure (austenite) and its transformation products (ferrite, pearlite, bainite and martensite, etc.) have different specific volumes and expansion coefficients, due to The volume effect caused by the phase change is superimposed on the expansion curve, which destroys the linear relationship between the expansion amount and the temperature, so that the phase change temperature can be determined according to the change point shown on the thermal expansion curve. The thermal expansion method is used to determine the phase transition point on a thermal simulation testing machine, which is the basis for establishing the CCT curve (continuous transformation curve of supercooled austenite) of steel materials. When measuring the expansion curve of supercooled ...

Claims

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Application Information

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IPC IPC(8): G01N25/02B01L7/00
Inventor 廉晓洁南海苗晓柳阳赵振铎任智勇成生伟
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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