CN-115655911-B - Material high temperature mechanical property testing device based on liquid medium transmission

CN115655911BCN 115655911 BCN115655911 BCN 115655911BCN-115655911-B

Abstract

The invention discloses a material high-temperature mechanical property testing device based on liquid medium transmission, which comprises a pipeline, a high-temperature box, a measuring mechanism and a pressure control mechanism, wherein one end of the pipeline is connected with the pressure control mechanism, the other end of the pipeline is connected with the measuring mechanism, a check valve is arranged in the pipeline and is arranged on a box body of the high-temperature box, the check valve is used for dividing the pipeline into a hot section pipeline and a cold section pipeline, the measuring mechanism and the hot section pipeline are arranged in the high-temperature box, a first liquid medium is arranged in the hot section pipeline, a second liquid medium is arranged in the cold section pipeline, and the first liquid medium is metal. According to the device for testing the high-temperature mechanical properties of the material based on liquid medium transmission, the check valve is arranged on the pipeline to divide the pipeline into the hot section and the cold section, so that different hydraulic mediums can be arranged, and the hydraulic bulge test of the small micro sample in the temperature range of 350-800 ℃ can be realized.

Inventors

ZHU BAOYIN
Luan Gaocan
FU YANGYANG
XIA XIANXI
JIN XIAO
MA QINZHENG
LIANG JUN
DU JINFENG

Assignees

苏州热工研究院有限公司
国家能源集团新能源技术研究院有限公司
中国广核集团有限公司
中国广核电力股份有限公司

Dates

Publication Date: 20260512
Application Date: 20221021

Claims (7)

1. The device for testing the high-temperature mechanical properties of the material based on liquid medium transmission is characterized by comprising a pipeline, a high-temperature box, a measuring mechanism and a pressure control mechanism, wherein one end of the pipeline is connected with the pressure control mechanism, the other end of the pipeline is connected with the measuring mechanism, a check valve is arranged in the pipeline and is arranged on a box body of the high-temperature box or between the high-temperature box and the pressure control mechanism, the check valve is used for dividing the pipeline into a hot section pipeline and a cold section pipeline, the measuring mechanism and the hot section pipeline are arranged in the high-temperature box, a first liquid medium is arranged in the hot section pipeline, a second liquid medium is arranged in the cold section pipeline, and the first liquid medium is metal; The check valve is a Tesla valve, the first liquid medium is lead bismuth eutectic alloy, the second liquid medium is hydraulic oil, a cooling system is arranged on the cold section pipeline and used for cooling the second liquid medium in the cold section pipeline, and the working temperature of the measuring mechanism and the hot section pipeline is higher than or equal to 300 ℃; The measuring mechanism comprises a first sealing tube, a second sealing tube, a scale and a displacement extensometer, wherein the first sealing tube is communicated with the pipeline, a sample to be measured is arranged between the first sealing tube and the second sealing tube, and the lower end of the scale is in contact with the upper surface of the sample to be measured.
2. The device for testing the high-temperature mechanical properties of the materials, which is disclosed in claim 1, is characterized in that a first sealing flange is fixed on the first sealing pipe, a second sealing flange is arranged on the second sealing pipe, a sealing gasket is arranged between the first sealing flange and the second sealing flange, the sealing gasket is in an annular arrangement, and a sample to be tested is positioned in the annular sealing gasket.
3. The device for testing high-temperature mechanical properties of materials according to claim 2, wherein the thickness of the sealing gasket is smaller than the thickness of the sample to be tested.
4. The device for testing the high-temperature mechanical properties of the materials according to claim 1, wherein a cavity is formed in the second sealing tube, and a sphere matched with the inner wall of the cavity is arranged at the lower end part of the scale.
5. The device for testing the high-temperature mechanical properties of materials according to claim 4, wherein the second sealing tube is provided with a limiting portion extending upwards corresponding to the cavity, the scale extends upwards from the cavity to pass through the limiting portion, and the displacement extensometer is arranged between the limiting portion and the scale.
6. The device for testing the high-temperature mechanical properties of the material according to claim 4, wherein an inlet pipe for introducing inert gas into the cavity is arranged on the second sealing pipe.
7. The device for testing the high-temperature mechanical properties of the materials according to claim 1, wherein a first measuring point is arranged on the first sealing tube, a second measuring point is arranged on the hot-section pipeline, and the measuring points are used for measuring temperature and pressure.

Description

Material high temperature mechanical property testing device based on liquid medium transmission Technical Field The invention relates to the technical field of high-temperature mechanical property testing of materials, in particular to a hydraulic bulge testing system for high-temperature mechanical property of materials by taking liquid metal as a transmission medium, which is suitable for high-temperature mechanical property testing of small micro samples of a metal fast reactor primary loop pressure-bearing member and a welding part thereof, and can also be used for high-temperature mechanical property testing of non-nuclear high-temperature pressure-bearing members of thermal power units and the like and small micro sample materials of the welding part thereof. Background The accurate acquisition of the high-temperature mechanical properties of the material by means of a nondestructive small micro-sample testing technology has important significance for evaluating the structural integrity of the pressure-bearing member of the in-service unit and the welded parts thereof. The hydraulic bulge test technology is formed by referencing the internal pressure explosion principle on the basis of the small punch test technology, and compared with the conventional small punch test technology, the hydraulic bulge test technology has the advantages of less influence factors, simple structural stress and easiness in theoretical modeling in the test process. Therefore, compared with the small punch test technology, the hydraulic bulge test technology has more accurate test results and more engineering application significance. The existing hydraulic bulge test equipment adopts hydraulic oil as a transmission medium, is influenced by the use temperature of the hydraulic oil of the test equipment, has the upper limit temperature of the test of the current hydraulic bulge equipment of lower than 300 ℃, and cannot meet the high-temperature mechanical property test requirement of materials above 300 ℃. Disclosure of Invention In view of the above, in order to overcome the defects of the prior art, the invention aims to provide a device for testing the mechanical properties of a material at high temperature based on liquid medium transmission, which can realize the related test at the high temperature of more than 300 ℃ to 800 ℃. In order to achieve the above purpose, the present invention adopts the following technical scheme: A material high-temperature mechanical property testing device based on liquid medium transmission comprises a pipeline, a high-temperature box, a measuring mechanism and a pressure control mechanism, wherein one end of the pipeline is connected with the pressure control mechanism, the other end of the pipeline is connected with the measuring mechanism, a check valve is arranged in the pipeline and is arranged on a box body of the high-temperature box, the check valve is used for dividing the pipeline into a hot section pipeline and a cold section pipeline, the measuring mechanism and the hot section pipeline are arranged in the high-temperature box, a first liquid medium is arranged in the hot section pipeline, a second liquid medium is arranged in the cold section pipeline, and the first liquid medium is metal. According to some preferred embodiments of the present invention, the measuring mechanism includes a first sealing tube, a second sealing tube, a scale, and a displacement extensometer, the first sealing tube is in communication with the pipe, the sample to be measured is disposed between the first sealing tube and the second sealing tube, and a lower end of the scale is in contact with an upper surface of the sample to be measured. The extensometer is used for measuring the relative displacement between the displacement scale and the second sealing tube. According to some preferred embodiments of the invention, a first sealing flange is fixed on the first sealing pipe, a second sealing flange is arranged on the second sealing pipe, a sealing gasket is arranged between the first sealing flange and the second sealing flange, the sealing gasket is in an annular arrangement, and a sample to be tested is positioned in the annular sealing gasket. The first sealing pipe and the second sealing pipe are connected and fixed through the first sealing flange and the second sealing flange and bolts. According to some preferred embodiments of the invention, the thickness of the gasket is less than the thickness of the test sample. The thickness of the sealing gasket is 98-99.5% of the thickness of the sample to be measured, and preferably the thickness of the sealing gasket is 99% of the thickness of the sample to be measured. According to some preferred embodiments of the invention, a cavity is formed in the second sealing tube, and a ball matched with the inner wall of the cavity is arranged at the lower end part of the scale. According to some preferred embodiments of the present invention, the seco