CN111007147A - Ultrasonic detection device and method for intergranular corrosion of austenitic heat-resistant steel pipe of boiler - Google Patents
Ultrasonic detection device and method for intergranular corrosion of austenitic heat-resistant steel pipe of boiler Download PDFInfo
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- CN111007147A CN111007147A CN201911378076.7A CN201911378076A CN111007147A CN 111007147 A CN111007147 A CN 111007147A CN 201911378076 A CN201911378076 A CN 201911378076A CN 111007147 A CN111007147 A CN 111007147A
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- resistant steel
- intergranular corrosion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/28—Details, e.g. general constructional or apparatus details providing acoustic coupling, e.g. water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0421—Longitudinal waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
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Abstract
The invention discloses an ultrasonic detection device and method for intergranular corrosion of a boiler austenitic heat-resistant steel pipe, and the ultrasonic detection device comprises a container, a high-frequency longitudinal wave probe, an ultrasonic wedge block, an ultrasonic pulse generator and an oscilloscope; the device and the method can realize the detection of the intergranular corrosion degree of the austenitic heat-resistant steel pipe of the boiler, have high detection efficiency, can reflect the state of in-service equipment, and the detection sensitivity of the intergranular corrosion depth can reach the grain level size.
Description
Technical Field
The invention belongs to the technical field of ultrasonic detection of intergranular corrosion of a boiler austenitic heat-resistant steel pipe, and relates to an ultrasonic detection device and method for intergranular corrosion of a boiler austenitic heat-resistant steel pipe.
Background
At the present stage, the intergranular corrosion degree of the austenitic heat-resistant steel pipe of the boiler is only detected by using a metallographic technique, the metallographic detection period is long, and the samples can be destroyed and sampled only at the corresponding positions of the austenitic heat-resistant steel pipe for two-dimensional observation, so that the state of equipment in service cannot be comprehensively reflected.
In order to improve the detection efficiency without damaging the material structure and fully reflect the state of in-service equipment, a detection technology is needed, the technology can detect the intergranular corrosion degree of the austenitic heat-resistant steel pipe of the boiler, can provide technical support for safe operation and efficient supervision and management of the austenitic heat-resistant steel pipe of the boiler, and can also provide technical reference for service life evaluation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an ultrasonic detection device and method for intergranular corrosion of a boiler austenitic heat-resistant steel pipe.
In order to achieve the aim, the ultrasonic detection device for the intergranular corrosion of the austenitic heat-resistant steel pipe of the boiler comprises a container, a high-frequency longitudinal wave probe, an ultrasonic wedge block, an ultrasonic pulse generator and an oscilloscope;
medium water is filled in the container, the high-frequency longitudinal wave probe, the austenite heat-resistant steel pipe of the boiler to be tested and the ultrasonic wedge block are immersed in the medium water, the ultrasonic wedge block is positioned on the outer wall of the austenite heat-resistant steel pipe of the boiler to be tested, the high-frequency longitudinal wave probe is positioned on the ultrasonic wedge block, and the high-frequency longitudinal wave probe is connected with the ultrasonic pulse generator and the oscilloscope.
The high-frequency longitudinal wave probe is a 15MHz high-frequency longitudinal wave probe.
The high-frequency longitudinal wave probe is connected with the ultrasonic pulse generator and the oscilloscope through a cable.
The ultrasonic detection method for the intergranular corrosion of the austenitic heat-resistant steel pipe of the boiler comprises the following steps:
the high-frequency pulse power sent by the ultrasonic pulse generator is transmitted to the high-frequency longitudinal wave probe, so that a probe wafer in the high-frequency longitudinal wave probe generates ultrasonic longitudinal waves with the frequency of 15MHz, the ultrasonic longitudinal waves are transmitted to the tube wall of the austenitic heat-resistant steel tube of the boiler to be detected through the ultrasonic wedge block and the medium water, when intergranular corrosion exists in the tube wall of the austenitic heat-resistant steel tube of the boiler to be detected, the ultrasonic longitudinal waves penetrate through the intergranular corrosion in the tube wall of the austenitic heat-resistant steel tube of the boiler to be detected to reach the bottom surface to generate pulse echoes, then the pulse echoes are received by the high-frequency longitudinal wave probe and are sent to an oscilloscope to be displayed, and the analysis of the intergranular corrosion degree in the tube wall of the austenitic.
And analyzing the intercrystalline corrosion degree in the tube wall of the austenitic heat-resistant steel tube of the boiler to be detected by using a pulse echo displayed by an oscilloscope according to a metallographic method.
The invention has the following beneficial effects:
the ultrasonic detection device and the method for the intergranular corrosion of the austenitic heat-resistant steel pipe of the boiler have the advantages that during the specific operation, the intergranular corrosion of the austenitic heat-resistant steel pipe of the boiler is detected by adopting a high-frequency ultrasonic detection technology, so that the detection sensitivity of the intergranular corrosion depth can reach the grain size, the ultrasonic longitudinal wave is transmitted to the pipe wall of the austenitic heat-resistant steel pipe of the boiler to be tested through the ultrasonic wedge block and the medium water, when intergranular corrosion exists in the pipe wall of the austenitic heat-resistant steel pipe of the boiler to be tested, the ultrasonic longitudinal wave passes through intergranular corrosion in the pipe wall of the austenitic heat-resistant steel pipe of the boiler to be measured to reach the bottom surface and then generates pulse echo, and then, an oscilloscope is used for displaying, and pulse echoes displayed by the oscilloscope are used for analyzing the intercrystalline corrosion degree in the tube wall of the austenitic heat-resistant steel tube of the boiler to be detected, so that the operation is convenient and simple, the detection efficiency is high, and the state of in-service equipment can be reflected. In addition, the high-frequency longitudinal wave probe, the austenitic heat-resistant steel pipe of the boiler to be detected and the ultrasonic wedge block are all immersed in the medium water, the amplitude of the pulse echo is not influenced by the magnitude of external force applied to the high-frequency longitudinal wave probe, and the detection precision is high.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a diagram of an echo waveform of an ultrasonic detection pulse without intergranular corrosion;
FIG. 3 is a diagram of an echo waveform of an ultrasonic detection pulse in the presence of intergranular corrosion.
FIG. 4 is a graph of intergranular corrosion texture morphology discovered using metallographic methods to verify ultrasonic testing.
Wherein, 1 is a container 1, 2 is medium water 2, 3 is a boiler austenite heat-resisting steel pipe to be tested 3, 4 is an oscilloscope 4, 5 is a high-frequency longitudinal wave probe 5, 6 is an ultrasonic wedge 6, 7 is a probe wafer 7, 8 is a cable 8, 9 is an ultrasonic pulse generator 9.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the ultrasonic detection device for detecting intergranular corrosion of the austenitic heat-resistant steel tube of the boiler, disclosed by the invention, comprises a container 1, a high-frequency longitudinal wave probe 5, an ultrasonic wedge 6, an ultrasonic pulse generator 9 and an oscilloscope 4; the container 1 is filled with medium water 2, a high-frequency longitudinal wave probe 5, a boiler austenite heat-resistant steel pipe 3 to be detected and an ultrasonic wedge 6 are immersed in the medium water 2, the ultrasonic wedge 6 is positioned on the outer wall of the boiler austenite heat-resistant steel pipe 3 to be detected, the high-frequency longitudinal wave probe 5 is positioned on the ultrasonic wedge 6, and the high-frequency longitudinal wave probe 5 is connected with an ultrasonic pulse generator 9 and an oscilloscope 4.
It should be noted that the high-frequency longitudinal wave probe 5 is a 15MHz high-frequency longitudinal wave probe; the high-frequency longitudinal wave probe 5 is connected with an ultrasonic pulse generator 9 and the oscilloscope 4 through a cable 8.
The ultrasonic detection method for the intergranular corrosion of the austenitic heat-resistant steel pipe of the boiler comprises the following steps:
sending high-frequency pulse voltage sent by an ultrasonic pulse generator 9 into a high-frequency longitudinal wave probe 5 to enable a probe wafer 7 in the high-frequency longitudinal wave probe 5 to generate ultrasonic longitudinal waves with the frequency of 15MHz, transmitting the ultrasonic longitudinal waves to the pipe wall of a boiler austenite heat-resistant steel pipe 3 to be detected after passing through an ultrasonic wedge 6 and medium water 2, generating pulse echoes after the ultrasonic longitudinal waves penetrate through intercrystalline corrosion in the pipe wall of the boiler austenite heat-resistant steel pipe 3 to be detected and reach the bottom surface when the intercrystalline corrosion exists in the pipe wall of the boiler austenite heat-resistant steel pipe 3 to be detected, then sending the pulse echoes into an oscilloscope 4 for displaying after being received by the high-frequency longitudinal wave probe 5, and analyzing the intercrystalline corrosion degree according to the waveform of the pulse echoes displayed in the oscilloscope 4, wherein the displayed pulse echoes are shown in a graph 3; as shown in fig. 2, when there is no intergranular corrosion in the tube wall of the austenitic heat-resistant steel tube 3 of the boiler to be measured, the ultrasonic detection shows that the primary wave and the secondary wave are very obvious, and the wave amplitude is also high. As shown in fig. 3, when intergranular corrosion exists in the boiler austenite heat-resistant steel pipe 3 to be detected, the primary wave shown by ultrasonic detection is relatively unobvious, the amplitude of the wave is relatively low, the secondary wave disappears, the intergranular corrosion degree of the boiler austenite heat-resistant steel pipe 3 to be detected, which is found by ultrasonic detection, needs to be further verified by using a metallographic method, the intergranular corrosion structure morphology obtained by the metallographic method is shown in fig. 4, and the result shows that the intergranular corrosion depth found by ultrasonic detection in fig. 3 is 3 austenite grain sizes.
Claims (5)
1. An ultrasonic detection device for intergranular corrosion of a boiler austenitic heat-resistant steel pipe is characterized by comprising a container (1), a high-frequency longitudinal wave probe (5), an ultrasonic wedge block (6), an ultrasonic pulse generator (9) and an oscilloscope (4);
the high-frequency longitudinal wave detector is characterized in that medium water (2) is arranged in the container (1), the high-frequency longitudinal wave probe (5), the boiler austenite heat-resistant steel pipe (3) to be detected and the ultrasonic wedge block (6) are immersed in the medium water (2), the ultrasonic wedge block (6) is located on the outer wall of the boiler austenite heat-resistant steel pipe (3) to be detected, the high-frequency longitudinal wave probe (5) is located on the ultrasonic wedge block (6), and the high-frequency longitudinal wave probe (5) is connected with the ultrasonic pulse generator (9) and the oscilloscope (4).
2. The ultrasonic testing device for the intergranular corrosion of the austenitic heat-resistant steel tube of the boiler according to claim 1, wherein the high-frequency longitudinal wave probe (5) is a 15MHz high-frequency longitudinal wave probe.
3. The ultrasonic testing device for the intergranular corrosion of the austenitic heat-resistant steel tube of the boiler according to claim 1, wherein the high-frequency longitudinal wave probe (5) is connected with the ultrasonic pulse generator (9) and the oscilloscope (4) through a cable (8).
4. An ultrasonic detection method for intergranular corrosion of a boiler austenitic heat-resistant steel pipe is characterized in that the ultrasonic detection device for intergranular corrosion of the boiler austenitic heat-resistant steel pipe based on the ultrasonic detection method for intergranular corrosion of the boiler austenitic heat-resistant steel pipe in claim 2 comprises the following steps:
high-frequency pulse power sent by an ultrasonic pulse generator (9) is pressed into a high-frequency longitudinal wave probe (5), so that ultrasonic longitudinal waves with the frequency of 15MHz are generated by a probe wafer (7) in the high-frequency longitudinal wave probe (5), the ultrasonic longitudinal waves are transmitted into the tube wall of the austenitic heat-resistant steel tube (3) of the boiler to be tested through an ultrasonic wedge block (6) and medium water (2), when intergranular corrosion exists in the tube wall of the austenitic heat-resistant steel tube (3) of the boiler to be tested, the ultrasonic longitudinal waves penetrate through the intergranular corrosion in the tube wall of the austenitic heat-resistant steel tube (3) of the boiler to be tested to reach the bottom surface to generate pulse echoes, then the pulse echoes are received by the high-frequency longitudinal wave probe (5) and sent into an oscilloscope (4) to be displayed, and the intergranular corrosion degree in the tube wall of the austenitic heat-resistant steel tube (3) of the boiler to be.
5. The ultrasonic detection method for the intergranular corrosion of the austenitic heat-resistant steel pipe of the boiler according to the claim 4, characterized in that the intergranular corrosion degree in the pipe wall of the austenitic heat-resistant steel pipe (3) of the boiler to be detected is analyzed by using a pulse echo displayed by an oscilloscope (4) according to a metallographic method.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911378076.7A CN111007147A (en) | 2019-12-27 | 2019-12-27 | Ultrasonic detection device and method for intergranular corrosion of austenitic heat-resistant steel pipe of boiler |
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| CN201911378076.7A CN111007147A (en) | 2019-12-27 | 2019-12-27 | Ultrasonic detection device and method for intergranular corrosion of austenitic heat-resistant steel pipe of boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610143A (en) * | 2020-06-17 | 2020-09-01 | 武汉理工大学 | Ship material cavitation erosion test real-time detection system and method based on ultrasonic detection technology |
| CN112378329A (en) * | 2020-10-21 | 2021-02-19 | 中国科学院金属研究所 | Eddy current detection method for thickness of corrosion layer on inner wall of austenite pipe |
-
2019
- 2019-12-27 CN CN201911378076.7A patent/CN111007147A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111610143A (en) * | 2020-06-17 | 2020-09-01 | 武汉理工大学 | Ship material cavitation erosion test real-time detection system and method based on ultrasonic detection technology |
| CN111610143B (en) * | 2020-06-17 | 2021-07-06 | 武汉理工大学 | Ship material cavitation erosion test real-time detection system and method based on ultrasonic detection technology |
| CN112378329A (en) * | 2020-10-21 | 2021-02-19 | 中国科学院金属研究所 | Eddy current detection method for thickness of corrosion layer on inner wall of austenite pipe |
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