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A device and method for ultrasonically inspecting the grain size of high-temperature fasteners in thermal power plants

A thermal power plant, ultrasonic technology, applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, use sound waves/ultrasonic waves/infrasonic waves for material analysis, and measurement devices, etc. It can solve the cumbersome, manpower-consuming and time-consuming metallographic inspection steps, etc. problems, to achieve the effect of high sampling efficiency, convenient operation and use, and simple test operation

Inactive Publication Date: 2020-10-09
郭京洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for 20Cr1Mo1VNbTiB steel bolts, it is necessary to carry out random inspection of the metallographic coarse grain structure, but the inspection steps of the metallographic structure are cumbersome and consume a lot of manpower and time.

Method used

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  • A device and method for ultrasonically inspecting the grain size of high-temperature fasteners in thermal power plants
  • A device and method for ultrasonically inspecting the grain size of high-temperature fasteners in thermal power plants
  • A device and method for ultrasonically inspecting the grain size of high-temperature fasteners in thermal power plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 As shown, Embodiment 1 discloses a device for ultrasonically inspecting the grain size of high-temperature fasteners in thermal power plants, which includes an ultrasonic flaw detector and a bolt test block.

[0046] The ultrasonic flaw detector is a Shantou ultrasonic CTS-1008 digital ultrasonic flaw detector, which includes a probe 3, and the probe 3 includes a first probe, a second probe and a third probe, and the first probe is a 51MHz shear wave oblique probe , the second probe is a 36MHz shear wave oblique probe, and the third probe is a 25MHz shear wave oblique probe.

[0047] As shown in Table 2, the bolt test blocks include comparison bolt test blocks of grades 3, 15, and each grade has a comparison bolt test block, which are the comparison bolt test blocks of the third grade and the comparison bolt test blocks of the fourth grade. The test block and the comparison bolt test block of the fifth grade. The comparison bolt test block of the thir...

Embodiment 2

[0050] Such as figure 1 , shown in table 2, embodiment 2 discloses a kind of device of ultrasonic inspection thermal power plant high-temperature fastener grain size, and it comprises ultrasonic flaw detector and bolt test block.

[0051] The ultrasonic flaw detector is Shantou Ultrasonic CTS-1008 digital ultrasonic flaw detector, which includes a probe 3, and the probe 3 includes a first probe, a second probe and a third probe, and the first probe is a 51MHz shear wave oblique probe , the second probe is a 36MHz shear wave oblique probe, and the third probe is a 25MHz shear wave oblique probe.

[0052] The bolt test blocks include the first comparison bolt test block, the second comparison bolt test block and the third comparison bolt test block of grades 3-5, wherein each comparison bolt test block includes rigid end bolts 1 and The flexible end bolt 2, the rigid end bolt 1 and the flexible end bolt 2 are connected as a whole, and the thread profile angle 5 of each comparis...

Embodiment 3

[0054] Such as figure 1 , image 3 As shown, embodiment 3 discloses a kind of method of ultrasonic inspection thermal power plant high-temperature fastener grain size, and it uses the device of embodiment 1, comprises the steps:

[0055] S1 Select the comparison bolt test block

[0056] The bolt to be tested is a flexible bolt with a diameter of 64mm and a length of 800mm. The diameter of the central hole 4 is 20mm. The comparison bolt test block is used as the comparison bolt test block, that is, the second comparison bolt test block of the fifth level is selected as the comparison bolt test block;

[0057] S2 Measure the amplitude of the reflected wave of the threads of the comparison bolt test block

[0058] Using the ultrasonic flaw detector and the comparison bolt test block in step S1, place the first probe on the flexible end bolt 2, adjust the refraction angle 6 of the ultrasonic wave in the comparison bolt test block and the comparison bolt test block The thread p...

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Abstract

The invention discloses a device and method for using ultrasonic waves to test the thermal power plant high temperature fastening part grain size, and relates to the technical field of metallurgical analysis. The device comprises an ultrasonic wave flaw detector and a bolt test block, the bolt test block comprises a comparison bolt test block of each grain size, the comparison bolt test block comprises a rigid end bolt and a flexible end bolt, and the rigid end bolt and the flexible end blot are integrally connected; the ultrasonic wave flaw detector comprises a probe. Through the ultrasonic wave flaw detector and the bolt test block, the grain size of a bolt to be tested is quickly detected, and the device is easy to operate, high in sampling efficiency and high in operability.

Description

technical field [0001] The invention relates to the technical field of metallurgical analysis, in particular to a device and method for ultrasonically inspecting the grain size of high-temperature fasteners in thermal power plants. Background technique [0002] Bolts are indispensable high-temperature fasteners in the connection of steam turbine cylinder blocks and door bodies in thermal power plants. The use of bolt connection makes the structure simpler and more diverse in style, and is widely used because of its high reliability of connection during equipment use and convenient loading and unloading during equipment maintenance. The preparation process of bolts is cumbersome and complicated. Due to the influence of temperature, cooling rate, alloy elements, etc. during the quenching and tempering process, it is easy to form coarse-grained structures with coarse grains in the billet, especially 20Cr1Mo1VnbTiB steel bolts are easy to form coarse-grained structures. organiz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/11G01N29/30
CPCG01N29/11G01N29/30G01N2291/015G01N2291/023G01N2291/0289G01N2291/2691
Inventor 郭京洋于洪权王鹏蔡立超韩日滔
Owner 郭京洋
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