CN105628276A - Residual stress test method for heat-resistant steel tube used for ultra-supercritical boiler - Google Patents
Residual stress test method for heat-resistant steel tube used for ultra-supercritical boiler Download PDFInfo
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- CN105628276A CN105628276A CN201510991244.5A CN201510991244A CN105628276A CN 105628276 A CN105628276 A CN 105628276A CN 201510991244 A CN201510991244 A CN 201510991244A CN 105628276 A CN105628276 A CN 105628276A
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- residual stress
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- supercritical boiler
- test method
- stress test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
- G01L1/255—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons using acoustic waves, or acoustic emission
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention relates to a residual stress test method for a heat-resistant steel tube used for an ultra-supercritical boiler. The residual stress test method comprises the following steps that a coupling device is arranged by using a transmitting polarization wave probe, and the coupling device can be coupled with the external surface of the steel tube and the probe can be firmly fixed; and ultrasonic incident waves with frequency F are introduced to the surface of the steel tube, the excitation angle of the ultrasonic incident waves is adjusted, the amplitude of incident and emergent waves is measured by using a detector, and residual stress is determined through reckoning according to incident time, emergent time and the frequency/wavelength, wherein the heat-resistant steel tube is an austenitic heat-resistant steel tube, and the ultrasonic frequency F is 51-54MHz. Lossless determination suitable for the steel tube with curvature can be performed by the method.
Description
Technical field
A kind of method that the present invention relates to residual stress, particularly relates to a kind of ultra-supercritical boiler heat resisting pipe residual stress test method.
Background technology
Super critical boiler refer to outlet vapor pressure more than the critical pressure 22.1MPa of water, operation temperature higher than the boiler of critical temperature 374 DEG C of water. Ultra-supercritical boiler is on the basis of super critical boiler, uses the New-type boiler of higher pressure and temperature to promote operating thermal efficiency. For the definition of ultra-supercritical boiler, but without unified delimitation in our times power industry, it is considered that the boiler that steam pressure is higher than 590 DEG C higher than 26MPa vapor (steam) temperature is ultra-supercritical boiler. Austenite heat-resistance steel pipe, receives significant attention with its high temperature corrosion and heat resistant and oxidation resistance in steam.
All producing various stress at boiler heat resisting steel pipe in manufacture, installation and operation, wherein the impact of residual stress is very big, it is easy to cause breaking of water-cooling wall, and it is necessary for therefore the residual stress of boiler heat resisting steel pipe being tested.
Austenite heat-resistance steel pipe has enough corrosion resistancies, is usually used in ultra-supercritical boiler, and the scope of the Cr of austenite heat-resistance steel pipe in the scope of 24-26%, Ni at 17-23%,
The measuring method of residual stress is broadly divided into following two measuring principle: Mechanical Method and Physical. The measuring principle of Mechanical Method is to process by measurand carries out cutting and separating etc., utilizes front and back variable quantity that strain relief produces to calculate residual stress. According to failure mode and the degree of measurand can be divided into, subdivision method, layer stripping, ring core method, Blind Hole Method etc. Physical measure. Physical detection ratio juris is to utilize all kinds of ray, ultrasound wave etc. as testing tool, by the measuring and calculating to its different reflection echos on the object of different residual stress, thus carrying out residual stress detection. Common physical detection methods is a lot, mainly includes x-ray method, magnetic survey method, supercritical ultrasonics technology etc. And physical method detection is because of its non-destructive, by extensive concern. The planes such as plate are carried out the method that ultrasound wave is tested by conventionally employed ultrasound wave, are not suitable for steel pipe is measured, are more measured not for austenite heat-resistance steel pipe.
And prior art not yet has employing ultrasound wave ultra-supercritical boiler heat resisting pipe carries out residual stress test, particular without carrying out residual stress test for austenite heat-resistance steel pipe.
Summary of the invention
The technical problem to be solved is to provide a kind of method adopting ultrasound wave that ultra-supercritical boiler heat resisting pipe is carried out residual stress test, especially a kind of adopts ultrasound wave for the method carrying out residual stress test of austenite heat-resistance steel pipe.
The technical scheme is that a kind of method adopting ultrasound wave that ultra-supercritical boiler heat resisting pipe is carried out residual stress test.
Method particularly includes: use the polarized wave probe launched, a coupling device is set, and coupling device can couple with ultra-supercritical boiler heat resisting pipe outer surface, and probe can be fixedly secured; To have the ultrasonic incidence wave that frequency is F and be incorporated into the surface of ultra-supercritical boiler heat resisting pipe, what adjust ultrasonic incidence wave excites angle, adopt the incident amplitude with outgoing wave of detectors measure, and determine residual stress according to the reckoning of time of incidence, outgoing time and frequency/wavelength.
The invention has the beneficial effects as follows: nondestructively, and the steel pipe to having curvature can be suitable for be measured.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described ultra-supercritical boiler heat resisting pipe is austenite heat-resistance steel pipe.
Further, described supersonic frequency F is 51-54MHz, it is preferable that described supersonic frequency F is 52-52.5MHz.
Above-mentioned further scheme is adopted to provide the benefit that: austenite heat-resistance steel pipe can be more suitable for.
Further, what adjust ultrasonic incidence wave excites angle, and what make the ultrasonic incidence wave after adjustment excites the angle absolute value with the difference of theoretical incident angle less than 5 degree.
Above-mentioned further scheme is adopted to provide the benefit that: more nondestructively, and the steel pipe to having curvature can be suitable for be measured.
Detailed description of the invention
Hereinafter principles of the invention and feature being described, example is served only for explaining the present invention, is not intended to limit the scope of the present invention.
Embodiment one:
A kind of method adopting ultrasound wave that ultra-supercritical boiler heat resisting pipe is carried out residual stress test. Method particularly includes: use the polarized wave probe launched, a coupling device is set, and coupling device can couple with outer surface of steel tube, and probe can be fixedly secured; To have the ultrasonic incidence wave that frequency is F and be incorporated into the surface of steel pipe, adjust the angle that excites of ultrasonic incidence wave, and adopt detectors measure incident and the amplitude of outgoing wave, and according to time of incidence, outgoing time, and frequency/wavelength, calculate and determine residual stress.
The invention has the beneficial effects as follows: nondestructively, and the steel pipe to having curvature can be suitable for be measured.
Embodiment two:
When applicant adopts the method detection residual stress of embodiment one for common steel tube, selecting ultrasonic conventional frequency 15-35MHz, the residual stress of mensuration is basically identical with the residual stress of Blind Hole Technique for Measuring, and range of error is at reasonable interval, it is not necessary to revise.
Embodiment three:
When applicant adopts the method for embodiment one to detect residual stress for austenite heat-resistance steel pipe, also ultrasonic conventional frequency 15-35MHz is selected, the residual stress measured and the residual stress of Blind Hole Technique for Measuring have relatively large deviation, need to be fitted result, but the result of matching is shown as nonlinear fitting so that the suitability that the method detects in the residual stress of austenite heat-resistance steel pipe weakens significantly.
Embodiment four:
Applicant in test, chances on, and when selecting frequency F to range for about 52MHz, the method for the mensuration residual stress in employing embodiment one is basically identical with the residual stress of Blind Hole Technique for Measuring, not in the further matching of needs. Although, adopt altofrequency 51-54MHz easily to decay, equipment requirements is higher. But the method can obtain partial data, it is possible to extrapolate the size of residual stress.
Therefore, described frequency F ranges for 51-54MHz, it is preferred to 52-52.5MHz. The beneficial effect adopting above-mentioned further scheme is able to be more suitable for austenite heat-resistance steel pipe. Trace it to its cause, it is possibly due to the scope of Cr of austenite heat-resistance steel pipe at 24-26%, the scope of Ni is at 17-23%, the content of Cr and Ni is higher, or the impact of the metallic element of other interpolation or carbon, ultimately result in the difference of steel duct crystal structure and the crystal structure within common steel tube.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (5)
1. a ultra-supercritical boiler heat resisting pipe residual stress test method, it is characterized in that, comprise the following steps: use the polarized wave probe launched, a coupling device is set, and this coupling device can couple with ultra-supercritical boiler heat resisting pipe outer surface, and can fixedly secure probe; To have the ultrasonic incidence wave that frequency is F and be incorporated into the surface of ultra-supercritical boiler heat resisting pipe, adjust the angle that excites of ultrasonic incidence wave, and adopt detectors measure incident and the amplitude of outgoing wave, and according to the time of incidence, outgoing time, and frequency/wavelength, calculate and determine residual stress.
2. a kind of ultra-supercritical boiler heat resisting pipe residual stress test method according to claim 1, it is characterised in that described ultra-supercritical boiler heat resisting pipe is austenite heat-resistance steel pipe.
3. a kind of ultra-supercritical boiler heat resisting pipe residual stress test method according to claim 1 or claim 2, it is characterised in that described supersonic frequency F is 51-54MHz.
4. a kind of ultra-supercritical boiler heat resisting pipe residual stress test method according to claim 3, it is characterised in that described supersonic frequency F is 52-52.5MHz.
5. a kind of ultra-supercritical boiler heat resisting pipe residual stress test method according to claim 1 or 4, it is characterized in that, what adjust ultrasonic incidence wave excites angle, and what make the ultrasonic incidence wave after adjustment excites the angle absolute value with the difference of theoretical incident angle less than 5 degree.
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| CN105628276B CN105628276B (en) | 2018-11-20 |
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2015
- 2015-12-24 CN CN201510991244.5A patent/CN105628276B/en active Active
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| CN1261434A (en) * | 1997-05-15 | 2000-07-26 | 荷高文斯铝轧制品有限公司 | Meassurement of residual stress |
| KR20120073410A (en) * | 2010-12-27 | 2012-07-05 | 주식회사 포스코 | Residual stress measuring apparatus |
| CN102636303A (en) * | 2012-04-12 | 2012-08-15 | 中国人民解放军装甲兵工程学院 | Method for measuring residual stress of thin plating layer based on surface ultrasonic waves |
| US20150300897A1 (en) * | 2012-11-29 | 2015-10-22 | Beijing Institute Of Technology | Sensor device and residual stress detection system employing same |
| CN104142195A (en) * | 2014-04-30 | 2014-11-12 | 李祚华 | Device and method for detecting interior initial stress of steel structural member based on ultrasonic method |
| CN104048786A (en) * | 2014-06-09 | 2014-09-17 | 中国航空工业集团公司北京航空材料研究院 | Method for nondestructive measurement of residual stress field in metal plate through ultrasonic waves |
| CN104048785A (en) * | 2014-06-09 | 2014-09-17 | 中国航空工业集团公司北京航空材料研究院 | Method for nondestructive evaluation of residual stress levels in aluminum alloy forged piece through ultrasonic waves |
| CN104316237A (en) * | 2014-11-12 | 2015-01-28 | 武汉钢铁(集团)公司 | Steel plate surface residual stress detection device and method based on online ultrasonic wave |
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