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Thermal fatigue testing device

A test device, thermal fatigue technology, applied in the direction of measuring devices, greenhouse gas reduction, instruments, etc., can solve the problems of uneven air injection of samples, cumbersome experimental operations, different cooling speeds, etc., and achieve improved reliability and uniform air injection angle Effect

Active Publication Date: 2019-11-05
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermal fatigue test device in Patent Document 1 must first be evacuated and then filled with protective gas before the thermal fatigue test can be performed. In the case of repeated sampling and observation, the experimental operation is cumbersome
In addition, the thermal fatigue test device of Patent Document 1 adopts a top-spray air cooling with a single nozzle, which may easily cause uneven air injection and different cooling speeds at different positions of the sample.

Method used

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Examples

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Embodiment 1

[0028] When the number of tests is small and the experimental samples need to be removed for observation every few heating cycles, in order to facilitate repeated sampling operations, it is possible to directly spray protective gas on the samples through the ventilation coil without using a vacuum cover. The anti-oxidation protection of the sample avoids the trouble of repeated vacuuming. The specific process is as follows. The commonly used aluminum alloy die-casting mold steel SKD 61 is used as the test sample, and the test sample is fixed in the heating coil with the upper and lower thimbles, and the test sample is placed in the center of the heating coil by adjusting the positions of the upper and lower thimbles. Open the inlet valve, inject protective gas (nitrogen or argon) through the inlet of the gas cooling part, and maintain the low-pressure injection state, and create a local protective gas atmosphere around the test sample inside the heating coil. Then energize th...

Embodiment 2

[0030] For the case where the number of tests is large and repeated sampling is not required for observation, it is recommended to use a vacuum cover to protect the sample from oxidation. The specific process is as follows: take SKD 61, a commonly used aluminum alloy die-casting mold steel, as the test sample, fix the test sample in the heating coil with the upper and lower thimbles, and place the test sample in the heating coil by adjusting the position of the upper and lower thimbles. right in the middle. Close the intake valve and exhaust valve, open the exhaust valve and vacuum system, pump the air in the vacuum cover to a vacuum state, and close the exhaust valve and vacuum system. Open the intake valve, fill the protective gas (nitrogen or argon) through the intake port of the gas cooling part until the pressure in the vacuum cover reaches 1 atmosphere, then open the exhaust valve, and energize the heating coil for heating for 5s. The test sample was heated up to 650°C,...

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Abstract

The invention discloses a thermal fatigue testing device. The thermal fatigue testing device is characterized by comprising a heating part, gas cooling parts and a sample fixing part, wherein the heating part is composed of heating coils screwed in a barrel shape and is used for heating a test sample; the gas cooling parts and the heating coils are alternately distributed in the length direction of the barrel shape, and gas outlets are uniformly distributed in the inner sides of the gas cooling parts; and the sample fixing part is used for fixing the test sample in a manner that the test sample penetrates through the insides of the heating coils and the gas cooling parts. The thermal fatigue testing device disclosed by the invention is simple to operate and uniform in sample cooling; the thermal fatigue surface with no pollution and no oxidation can be obtained, so that subsequent characterization and testing (especially characterization of residual stress) are facilitated, and the reliability of thermal fatigue performance evaluation of materials such as hot work die steel and the like is improved.

Description

technical field [0001] The invention relates to a thermal fatigue test device, in particular to a thermal fatigue test device for hot work die steel. Background technique [0002] The main feature of the working conditions of hot work die steel is intermittent contact with hot metal, and the surface must be cooled by water, oil, air and other media after contact. Therefore, its working state is repeated heating and cooling, the surface structure produces repeated thermal expansion and cold contraction, and is repeatedly subjected to tensile and compressive stresses, and finally surface cracks appear, that is, thermal fatigue failure occurs. [0003] Thermal fatigue test is an important means to predict the thermal fatigue life of die steel. Accurate characterization of thermal fatigue cracks and evaluation of thermal fatigue stress evolution law are the prerequisites for accurate prediction. At present, there have been many reports on the thermal fatigue behavior of die ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/60
CPCG01N3/60G01N2203/0057G01N2203/0062G01N2203/0073G01N2203/0224Y02E30/30
Inventor 王博赵幸锋顾剑锋
Owner SHANGHAI JIAO TONG UNIV
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