Preparation method of thermal fatigue crack simulation test block

A thermal fatigue, test block technology, applied in instruments, measuring devices, scientific instruments, etc., can solve problems such as inability to batch production, lack of contrast, and large differences in samples

Pending Publication Date: 2021-06-04
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thermal fatigue crack simulation test blocks can be obtained from samples containing natural defects found in previous inspections, but this method is highl

Method used

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  • Preparation method of thermal fatigue crack simulation test block
  • Preparation method of thermal fatigue crack simulation test block
  • Preparation method of thermal fatigue crack simulation test block

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preparation example Construction

[0046] Such as figure 1 , the preparation method of thermal fatigue crack simulation test block of the present invention, comprises the following steps:

[0047] Step 1: If figure 2 , in the middle of the test block 1 through the tube hole 3 processing, around the tube hole 3 on one side of the test block 1 process a number of crack induction tip 4. The test block 1 is a cuboid, and the four corners of the test block 1 are provided with connection holes 2, and the connection holes 2 on the test block 1 are fixed on the base through connectors; a heat insulation layer is provided between the test block 1 and the base . The base is a steel plate slightly larger than the test block 1, with handles for moving the base at both ends. Preferably, the material of the test block 1 is the same as that of the workpiece to be inspected, and the curvature of the test block 1 is equal to that of the workpiece to be inspected.

[0048] Preferably, the crack induction tips 4 are evenly d...

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Abstract

The invention discloses a preparation method of a thermal fatigue crack simulation test block, and belongs to the technical field of preparation of nondestructive testing test blocks. Firstly, a through pipe hole is machined in the middle of a test block, and a plurality of crack induction tips are machined around the pipe hole in one face of the test block; then, the test block is rapidly cooled after being repeatedly and rapidly heated to a high temperature, so that thermal fatigue cracks are generated on the test block; and finally, the pipe hole is reamed, the crack induction tip is removed, and the detection surface of the test block is polished until the roughness is consistent with that of the detected workpiece, thereby completing the preparation of the thermal fatigue crack simulation test block. The thermal fatigue crack simulation test block prepared by adopting the method can be used for verifying and evaluating a detection system and a detection process, the identification, positioning and quantification capability of the detection system on thermal fatigue cracks or other characteristic defects with the thermal fatigue cracks is improved, harmful defects of a high-temperature steam main pipe are found, and safe operation of a power station unit is ensured.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing test block preparation, and relates to a preparation method of a thermal fatigue crack simulation test block. Background technique [0002] With the continuous increase of temperature and pressure parameters of thermal power units at home and abroad, the increase of service time of in-service units and the deep peak regulation of units, in recent years, thermal power units have repeatedly experienced thermal fatigue caused by high-temperature steam pipe sampling holes and desuperheaters. Leakage accident of steam main pipe caused by crack. Thermal fatigue cracks exist in two forms near the sampling tube hole and the desuperheater of the high-temperature steam pipeline: thermal fatigue cracks on the inner wall of the pipeline and radial radial thermal fatigue cracks around the drainage tube holes on the inner wall of the pipeline. Sometimes the two cracks exist at the same time . T...

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Application Information

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IPC IPC(8): G01N29/30
CPCG01N29/30
Inventor 张红军安国栋李佼佼高磊孟永乐吕一楠
Owner XIAN THERMAL POWER RES INST CO LTD
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