Testing method for performing rapid water quenching on compression test sample
A test method and quenching test technology, applied in the preparation of test samples, etc., can solve the problems of spending a lot of time, slow cooling, complicated equipment operation, etc., to achieve high test results accuracy, improved work efficiency, and no need for cleaning. link effect
Active Publication Date: 2013-01-02
NANJING IRON & STEEL CO LTD
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Problems solved by technology
Although the thermal simulation testing machine provides corresponding quenching equipment, the operation of the equipment is cumbersome and the cooling rate is slow (the maximum cooling rate is 50 °C / s at around 800-500 °C), and the martensitic quenching structure required by the test cannot be obtained completely. Impact test result analysis
If spraying water directly for cooling, on the one hand, it is easy to quench the anvil and cause damage to the equipment; on the other hand, it takes a lot of time (more than 4 hours) to clean the test chamber, and it is very easy to cause the vacuum system to fail, affecting the normal use of the equipment
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[0020] A test method for rapid water quenching of a compressed sample on a Gleeble 3800 thermal simulation testing machine related to the present invention will be further described in detail below in conjunction with specific examples.
[0021] The test requires judging the effect of deformation temperature on dynamic recrystallization of austenite by observing the austenite grain size. In order to observe clearer austenite grains, rapid water quenching must be adopted. The test steel type is E36, and the sample size is a Φ10×15mm cylindrical sample. The simulation process is: first heat to 1250°C at a rate of 10°C / s, hold for 600s to fully dissolve the alloy elements, and then heat at 2°C / s Cool at the speed of s to the test temperature (respectively 1000°C, 950°C and 900°C), hold for 30s (mainly to make the temperature uniform) and then compress, the pre-deformation amount is 0.8, and the deformation rate is 1s -1 , Rapid water quenching after deformation. After using the...
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The invention discloses a testing method for performing rapid water quenching on a compression test sample, which comprises the following steps: before testing, dismounting a protection device on a test chamber door and inserting into a corresponding slot; after finishing mounting the test sample, repeatedly performing the vacuumizing and filling process on a test chamber, and filling inert gas to ensure that the pressure of the finally filled gas is -5inHg; in the programming process, enabling a pressure head of a thermal simulation testing machine to retreat 2-4mm after the end of the conventional test, and determining the total operation time t; starting the thermal simulation testing machine, and when the operation time reaches (t-10)s, opening a deflation valve on the test chamber for deflation to normal pressure; and opening the test chamber door and immediately putting the test sample into a beaker containing water, thereby completing the quenching test. The testing method is low in testing cost and simple to operate, and can not damage the equipment, and the accuracy of the test result and the working efficiency of the operator are high. The testing method is suitable for performing the rapid water quenching test on the Gleeble3800 thermal simulation testing machine.
Description
technical field [0001] The invention belongs to the field of thermal simulation physical tests, more specifically, the invention relates to a test method for rapid water quenching of compressed samples on a Gleeble 3800 thermal simulation testing machine. Background technique [0002] With the continuous development of the functions of the thermal simulation testing machine, the physical metallurgical process of most materials can be reproduced on the thermal simulation testing machine, and can provide researchers with a large amount of required test data. However, for some special tests, it is not enough to analyze only the test data, and it is also necessary to know the structure and shape of the material at high temperature and other related information. At present, rapid quenching is the most effective and commonly used method. Although the thermal simulation testing machine provides corresponding quenching equipment, the operation of the equipment is cumbersome and...
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IPC IPC(8): G01N1/42
Inventor 吴年春尹雨群范益高燕王建
Owner NANJING IRON & STEEL CO LTD