CN109142532A - A kind of lossless detection method and device of the damage of high martensitic chromium heat resisting steel connector creep hole - Google Patents
A kind of lossless detection method and device of the damage of high martensitic chromium heat resisting steel connector creep hole Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The present invention provides the lossless detection methods and device of a kind of damage of high martensitic chromium heat resisting steel connector creep hole, by taking non-linear ultrasonic technology to solve the detection problem of novel high martensitic chromium heat resisting steel connector creep hole damage, using the generated higher hamonic wave that interacts between high energy radio-frequency pulse and material internal microdefect, the degree of injury of connector is assessed.The present invention passes through the high-temperature creep injury degree using non-linear ultrasonic technology detection high martensitic chromium heat resisting steel connector, establish the quantitative relationship between creep hole and non-linear ultrasonic parameter, to realize the long-term safety operation for ensureing super fired power generating unit to the novel high martensitic chromium heat resisting steel connector qualitative assessment that creep hole damages during one's term of military service.
Description
Technical field
The invention belongs to field of metal material detection, and in particular to a kind of detection high martensitic chromium heat resisting steel connector creep hole
The method and device of hole damage.
Background technique
The novel high martensitic chromium heat resisting steel such as T/P91, T/P92, T/P122 and T/P911 have good thermophysical property,
Thermal fatigue resistance, especially have excellent high temperature creep property, be manufacture Main Steam Piping of Ultra Supercritical Units, header with
And the ideal material of heating surface tube.However, the welding point of such steel has serious IV type creep rupture to incline during military service
To significantly reducing the high temperature creep strength and rupture life of connector, lead to component initial failure.IV type creep rupture is a kind of
The great brittle fracture of harmfulness, be easy to cause serious accident.IV type fracture be connector weak part (heat affected area,
HAZ) germinate hole in creep process, pore quantity gradually increases and grows up later, is finally collected as crackle, and crackle is quick
Extension eventually leads to fracture.Research finds that creep hole injury stage accounts for most times in connector service life, or even runs through the longevity
The overall process of life, therefore supervision hole damage status is detected for early warning early, it is disconnected to prevent IV big type creep of harmfulness
It splits extremely important.
During IV type creep rupture, hole first occurs at the center portion of connector, therefore can not use surface coating metallographic etc.
Detection method discovery.Conventional linear ultrasonic detecting technology (such as longitudinal wave velocity method and damped method) only to the defect of volume type and
With open crack-sensitivity, the macroscopic cracking that can only be just formed detection tabs latter stage creep life, it is difficult to find early metaphase
The creep hole of appearance, therefore can not achieve timely early warning.In view of the above-mentioned problems, needing one kind to novel high martensitic chromium at present
The method that heat resisting steel connector creep hole damage status carries out non-destructive testing evaluation prevents IV type to be broken thing so as to early warning early
Therefore unexpected generation.
Summary of the invention
In view of the problems of the existing technology, the technical solution that the present invention uses to solve problems of the prior art
It is as follows:
A kind of lossless detection method of high martensitic chromium heat resisting steel connector creep hole damage, which is characterized in that including such as
Lower step:
Step 1, using detection device to sample carry out non-linear ultrasonic measurement, after having measured, to the signal in time domain into
Row Fourier transformation (FFT), obtains the frequency spectrum of sample, and the first harmonic magnitude A of measurement point is read from the result of frequency spectrum1And it is secondary
The amplitude A of harmonic wave2；
Step 2, by parameter A obtained in step 11A2Substitute into non-linear ultrasonic parameter calculation formula:It calculates
The non-linear ultrasonic parameter beta of joint samples heat affected area out；
Step 3 goes out model to sample to be evaluated progress experimental fitAnd it determines in model formation
Three coefficient C1, t1, β0Size, wherein x be creep hole area fraction；
Step 4 substitutes into the non-linear ultrasonic parameter beta measured in the model of fit having determined in step 3, can assess
The area fraction x of creep hole, to realize the purpose of evaluation test sample creep impairment degree.
The measurement position of the non-linear ultrasonic measurement is set in the heat affected area of joint samples weld seam two sides.
Non-linear ultrasonic parameter calculation formula in the step 2Specific derivation process it is as follows:
One column high energy pulse is emitted on examined workpiece, ultrasonic wave can be with the microdefect of material internal in communication process
Interaction, so that the fundamental wave A in frequency domain1It is distorted and causes second harmonic A2It generates；
For metal material, since stress σ and strain stress are at nonlinear relationship, described by Hooke's law are as follows:
σ=E ε (1+ β ε+...) (1)
In formula, E is elasticity modulus, and β is known as second order elasticity coefficient, also referred to as nonlinear parameter, when list frequency ultrasound
After longitudinal wave passes through sample, one-dimensional wave equation is expressed with following formula:
Wherein, ρ is the mass density of particle, and u is the displacement of particle, and t is the time, and x is that longitudinal wave moves propagation distance (workpiece thickness
Degree), in conjunction with the relationship between particle strain stress and dielectric displacement:
Obtain the nonlinear wave equations of dielectric displacement:
As a list frequency sine-wave u=A1When sin ω t is applied on nonlinear dielectric, particle is acquired by iteration twice
The approximate solution of displacement components u:
Wherein ω is angular frequency, and k is wave number, and the expression formula of nonlinear parameter can be determined according to above formula:
Since k and x is constant, measurement and calculating for convenience, uses the simplification table of non-linear ultrasonic parameter in engineering
Up to formula:
The establishment process of model of fit in the step 3 are as follows: by studying under different creep impairment states, non-linear ultrasonic
The corresponding relationship of parameter and welding point creep hole, fitting have obtained following relational model:
Wherein, x is the area fraction of creep hole in field range, and β is the nonlinear parameter of material, C1, t1, β0It is normal
Number.
A kind of non-destructive testing device of high martensitic chromium heat resisting steel connector creep hole damage, including ultrasonic pulse occur
Device, output impedance, attenuator, duplexer, filter, ultrasonic transducer and oscillograph, the ultrasonic pulse generator are used for
High energy radio frequency (RF) impulse train is excited, is sequentially connected output impedance, attenuator, duplex in the output port of ultrasonic pulse generator
The transmitting probe of device, filter and ultrasonic transducer, the output impedance is for guaranteeing singal source resistance and connect transmission line
Characteristic impedance it is equal in magnitude and phase is identical, attenuator is used to bear the decaying of output power；Duplexer is for removing system
Generated noise signal when impulse ejection；Filter is then used to filter other frequency components, guarantees the pure of emission signal frequency
Net property receives basic wave signal in the receiving transducer of the receiving port connection ultrasonic transducer of ultrasonic pulse generator with this
And second harmonic signal, an oscillograph is connected on the external interface of ultrasonic pulse generator, is existed for observing reception signal
Waveform in time domain scale, the mode of present apparatus ultrasonic signal emission using normal beam technique (hair one is received), put by measured sample
It sets between transmitting probe and receiving transducer, is coupled before measurement with ultrasonic coupling agent.
The output voltage of the ultrasonic pulse generator is not less than 450V, and output power is not less than 500W.
The transmitting probe of the ultrasonic transducer and the frequency of receiving transducer are respectively 2.5-5MHz and 5-10MHz.
The present invention has the advantage that
IV type creep failure of high martensitic chromium heat resisting steel connector is a kind of failure mode of great harmfulness.Previous research table
Bright, conventional linear ultrasonic detecting technology due to the limitation of sensitivity, weld in this kind of steel by ultrasonic longitudinal wave sonic velocity change and acoustic attenuation
Varying less within the scope of connector creep life cannot achieve the lesion assessment of IV type creep failure of butt joint.In this patent,
The sensitivity of used non-linear ultrasonic measuring technique is higher, shows as in the 60% of connector creep life range, non-thread
Property parameter has risen 50%, that is, apparent increase has occurred.Therefore, adopting can effectively assess with non-linear ultrasonic detection
The creep impairment of welding point prevents the unexpected generation of IV type fracture accident to realize early early warning.
Detailed description of the invention
Fig. 1 is the schematic diagram for the high martensitic chromium steel connector creep rupture sample that the present invention uses；
Fig. 2 is the high martensitic chromium steel connector creep rupture sample creep hole lesion assessment position signal that the present invention uses
Figure；
Fig. 3 is non-linear detection system schematic of the present invention；
Fig. 4 is the metallograph of high martensitic chromium steel connector heat affected area creep hole；
Fig. 5 is the corresponding relationship between nonlinear parameter and the damage of high martensitic chromium steel connector creep hole；
Relational graph of the Fig. 6 between nonlinear parameter and high martensitic chromium steel connector creep life；
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described,
The present invention provides a kind of lossless detection method of novel high martensitic chromium heat resisting steel connector creep hole damage, solutions
The problem of certainly existing lossless detection method can not detect.The invention is characterized in that non-linear ultrasonic technology solves novel high chromium geneva
The detection problem of body heat resisting steel connector creep hole damage, principle be using high energy radio-frequency pulse and material internal microdefect it
Between interact caused by higher hamonic wave, assess the degree of injury of connector.The present invention is detected high using non-linear ultrasonic technology
The high-temperature creep injury degree of chromium martensitic heat resisting steel connector establishes the quantitative pass between creep hole and non-linear ultrasonic parameter
System ensures super to realize to the novel high martensitic chromium heat resisting steel connector qualitative assessment that creep hole damages during one's term of military service
The long-term safety of fired power generating unit is run.The present invention includes the determination of non-linear ultrasonic parameter, and non-linear ultrasonic detection system is taken
It builds and the determination of non-linear detection technique.
(1) determination of non-linear ultrasonic measurement parameter
If a column high energy pulse is emitted on examined workpiece, ultrasonic wave can lack in communication process with the micro- of material internal
Interaction is fallen into, so that the fundamental wave A in frequency domain1It is distorted and causes second harmonic A2It generates.
For metal material, since stress σ and strain stress are at nonlinear relationship, it can be described by Hooke's law:
σ=E ε (1+ β ε+...) (1)
In formula, E is elasticity modulus, and β is known as second order elasticity coefficient, also referred to as nonlinear parameter.When list frequency ultrasound
After longitudinal wave passes through sample, one-dimensional wave equation can be written as following formula:
Wherein, ρ is the mass density of particle, and u is the displacement of particle, and t is the time, and x is that longitudinal wave moves propagation distance (workpiece thickness
Degree).In conjunction with the relationship between particle strain stress and dielectric displacement:
It can be concluded that the nonlinear wave equations of dielectric displacement:
As a list frequency sine-wave u=A1When sin ω t is applied on nonlinear dielectric, it can be acquired by iteration twice
The approximate solution of particle displacement u:
Wherein ω is angular frequency, and k is wave number, and the expression formula of nonlinear parameter can be determined according to above formula:
Since k and x is constant, measurement and calculating for convenience, can be used the letter of non-linear ultrasonic parameter in engineering
Change expression formula:
(2) relational model of non-linear ultrasonic parameter and high martensitic chromium steel connector creep hole
If a column high energy pulse is emitted on examined workpiece, ultrasonic wave can lack in communication process with the micro- of material internal
Interaction is fallen into, so that the fundamental wave in frequency domain is distorted and higher hamonic wave is caused to generate.Due to high martensitic chromium steel connector
Heat affected area can generate creep hole during long-term creep, and the density variation inside and outside hole is very big.When ultrasonic wave passes through
When creep hole, i.e., refraction and scattering can occur in the interface inside and outside hole, the propagation path of ultrasonic wave is caused to change,
And cause the rising of second harmonic amplitude and the variation of nonlinear parameter in frequency domain.Since ultrasonic wave propagates road in material internal
The degreeof tortuosity of diameter depends on quantity and volume that creep hole is formed by when creep.Therefore by utilizing non-linear ultrasonic skill
Art measures the second harmonic amplitude and non-linear ultrasonic parameter of material, can defect formed in research material, and it is right
Its creep impairment is assessed.In the present invention, by studying under different creep impairment states, non-linear ultrasonic parameter and welding
The corresponding relationship of connector creep hole, fitting have obtained relational model below:
Wherein, x is the area fraction of creep hole in field range, and β is the nonlinear parameter of material, C1,t1,β0It is normal
Number.
(3) non-linear ultrasonic detection system is built
The present invention provides a kind of non-linear ultrasonic detection system of high martensitic chromium heat resisting steel connector creep hole damage
It builds, which includes ultrasonic pulse generator, output impedance, attenuator, duplexer, filter, ultrasonic transducer and show
Wave device.Wherein ultrasonic pulse generator is for exciting high energy radio frequency (RF) impulse train, it is desirable that the output electricity of ultrasonic pulse generator
Pressure is not less than 450V, and output power is not less than 500W.It is sequentially connected output impedance in the output port of ultrasonic pulse generator, is declined
Subtract device, duplexer, filter and ultrasonic transducer (5MHz transmitting probe).Wherein output impedance is for guaranteeing singal source resistance
Equal in magnitude and phase is identical with the characteristic impedance of connect transmission line, and attenuator then is used to bear the decaying of output power；Duplex
Generated noise signal when device is for removing system pulses transmitting；Filter is then used to filter other frequency components, guarantees hair
Penetrate the pure property of signal frequency.Ultrasonic transducer (10MHz) is connected in the receiving port of ultrasonic pulse generator, is received with this
Basic wave signal and second harmonic signal.The mode of ultrasonic signal emission is using normal beam technique (hair one is received), measured sample
It is placed between transmitting probe and receiving transducer, is coupled before measurement with ultrasonic coupling agent.In addition, in ultrasonic pulse generator
External interface on connect an oscillograph, for observe waveform of the reception signal in time domain scale.
(4) non-linear ultrasonic characterization processes
Firstly, setting the pulse number of high energy radio-frequency pulse group, pulse daley and pulse on ultrasonic pulse generator
Amplitude, the material and thickness of specific basis of design examined workpiece.It, can be right after the parameter setting on ultrasonic pulse generator is complete
Joint samples carry out non-linear ultrasonic assessment.The frequency of ultrasonic transducer (transmitting probe and receiving transducer) can use respectively
2.5-5MHz and 5-10MHz.Since creep hole and IV type crackle are easiest to appear in the heat affecting of high martensitic chromium steel connector
Area (FGHAZ), therefore the measurement position of non-linear ultrasonic is also set at the heat affected area of joint samples weld seam two sides.When non-linear
After ultrasonic measurement is complete, Fourier transform (FFT) is carried out to the signal in time domain, obtains the frequency spectrum of joint samples.From the knot of frequency spectrum
First harmonic magnitude (the A of measurement point is read in fruit1) and second harmonic amplitude (A2).According to nonlinear parameter formula in (6)The non-linear ultrasonic parameter of joint samples heat affected area can be calculated.According to the ascensional range of nonlinear parameter,
The creep impairment of connector weak location can be assessed.
The present invention is directed to assess hole of high martensitic chromium heat resisting steel connector during high-temerature creep to damage, in the present invention
Using a kind of typical heat resisting steel connector, i.e., the welding point of T92 steel is as embodiment.
(1) in order to use non-linear ultrasonic technology evaluation T92 steel welded joint under different creep hole degree of injury
Reaction, establishes the quantitative relationship between nonlinear parameter and creep hole.Prepare T92 steel welded joint at 650 DEG C/90MP not
With creep impairment degree sample, i.e., respectively in rupture life (tf) 20%, 40%, 60%, 80% stop test, obtain several
The sample of different creep impairment degree (see Fig. 1).
(2) high energy radio frequency (RF) impulse train is excited using ultrasonic pulse generator, to the sample of different creep impairment degree
Carry out non-linear ultrasonic assessment.The setting of ultrasound parameter depends on the thickness and material of examined workpiece, to the echo received
Signal carries out FFT transform, so that the time-domain signal received is transformed into frequency-region signal.Due to heat affected area be T92 steel connector most
It is easy to appear the position of creep hole.Therefore, the position of the present embodiment assessment is the position 1 and 2 in Fig. 2, has separately included two
The heat affected area of side.The emission mode of ultrasound is set as longitudinal wave through transmission technique (hair one is received), transmitting probe and receiving transducer difference
Using ultrasonic normal probe SIUI-5Z6N and SIUI-10Z6N.
(3) respectively to original sample, 0.2tfCreep sample, 0.4tfCreep sample, 0.6tfCreep sample, 0.8tfCreep
Sample and 1.0tfCreep sample (fracture sample) carries out non-linear ultrasonic assessment.Measure the primary wave of each 2 positions of sample
Amplitude A1With the amplitude A of second harmonic2, and according to the formula in step 3.3Material nonlinearity parameter is calculated, and
It is recorded in table 1.Wherein, the fracture position of sample occurs at position 1 (see Fig. 1), therefore about the non-linear super of fracture sample
Acoustic evaluation carries out at its symmetrical position 2.The result shows that the nonlinear parameter of T92 steel welded joint two sides heat affected area is all
Rise with the increase of creep time, and the nonlinear parameter of two sides differs very little, shows non-linear ultrasonic technology for visiting
The stability for surveying connector creep impairment is preferable.
The non-linear ultrasonic data result that table 1 is measured using the invention patent
(4) after the completion of measuring non-linear parameters, metallographic sight is carried out to the T92 steel joint samples of different creep life scores
It examines, counts the creep hole parameter of heat affected area.Due to the symmetry of welding point, the present embodiment uniformly observes the joint samples right side
The heat affected area (corresponding to the measurement position point 2 of non-linear ultrasonic) of side.Different creep lives point are shot under metallographic microscope
The hole photo (see Fig. 4) of number sample heat affected area, recycles Image-Pro-Plus (IPP) software quantitative statistics heat affected area
Hole area score, the results are shown in Table 2.
The hole area score of table 2T92 steel connector creep sample heat affected area
| Measurement position 2 | Hole area score |
| Original sample | Nf=3.37 × 10-3~3.68 × 10-3% |
| 0.2tf | Nf=9.36 × 10-3~9.91 × 10-3% |
| 0.4tf | Nf=1.04 × 10-1~1.41 × 10-1% |
| 0.6tf | Nf=2.74 × 10-1~3.13 × 10-1% |
| 0.8tf | Nf=7.36 × 10-1~8.03 × 10-1% |
| 1.0tf(fracture sample) | Nf=2.33~2.83% |
(5) the hole area score of this six roots of sensation T92 steel connector creep sample is selected, and is set as independent variable, is surveyed corresponding
The nonlinear parameter obtained is set as dependent variable, can draw out T92 steel connector creep hole area score-nonlinear parameter and become
Change curve (see Fig. 5).By substituting into formulaIt can be fitted to obtain the coefficient of T92 steel connector creep sample model
C1=-0.0014, t1=0.5955, y0=0.0027.In addition, creep life independent variable will be set as, corresponding will measure non-thread
Property parameter setting be dependent variable, T92 steel connector creep life score-nonlinear parameter change curve can also be drawn out (see figure
6), that is, reach using inside a kind of non-linear ultrasonic detection technique (nondestructive lossless detection method) assessment T92 steel connector
The purpose of creep hole damage.
Protection scope of the present invention is not limited to the above embodiments, it is clear that those skilled in the art can be to this hair
It is bright to carry out various changes and deformation without departing from scope and spirit of the present invention.If these changes and deformation belong to power of the present invention
In the range of benefit requirement and its equivalent technologies, then including the intent of the present invention also includes these changes and deforms.
Claims (7)
1. a kind of lossless detection method of high martensitic chromium heat resisting steel connector creep hole damage, which is characterized in that including as follows
Step:
Step 1 carries out non-linear ultrasonic measurement to sample using detection device, after having measured, carries out Fu to the signal in time domain
In leaf transformation (FFT), obtain the frequency spectrum of sample, from the result of frequency spectrum read measurement point first harmonic magnitude A1And second harmonic
Amplitude A2；
Step 2, by parameter A obtained in step 11A2Substitute into non-linear ultrasonic parameter calculation formula:It calculates and connects
The non-linear ultrasonic parameter beta of head sample heat affected area；
Step 3 goes out model to sample to be evaluated progress experimental fitAnd determine three in model formation
Coefficient C1, t1, β0Size, wherein x be creep hole area fraction；
Step 4 substitutes into the non-linear ultrasonic parameter beta measured in the model of fit having determined in step 3, can assess creep
The area fraction x of hole, to realize the purpose of evaluation test sample creep impairment degree.
2. a kind of lossless detection method of high martensitic chromium heat resisting steel connector creep hole damage as described in claim 1,
Be characterized in that: the measurement position of the non-linear ultrasonic measurement is set in the heat affected area of joint samples weld seam two sides.
3. a kind of lossless detection method of high martensitic chromium heat resisting steel connector creep hole damage as described in claim 1,
It is characterized in that: non-linear ultrasonic parameter calculation formula in the step 2Specific derivation process it is as follows:
One column high energy pulse is emitted on examined workpiece, ultrasonic wave can be mutual with the microdefect of material internal in communication process
Effect, so that the fundamental wave A in frequency domain1It is distorted and causes second harmonic A2It generates；
For metal material, since stress σ and strain stress are at nonlinear relationship, described by Hooke's law are as follows:
σ=E ε (1+ β ε+...) (1)
In formula, E is elasticity modulus, and β is known as second order elasticity coefficient, also referred to as nonlinear parameter, when a list frequency ultrasonic longitudinal wave
After sample, one-dimensional wave equation is expressed with following formula:
Wherein, ρ is the mass density of particle, and u is the displacement of particle, and t is the time, and x is that longitudinal wave moves propagation distance (thickness of workpiece),
In conjunction with the relationship between particle strain stress and dielectric displacement:
Obtain the nonlinear wave equations of dielectric displacement:
As a list frequency sine-wave u=A1When sin ω t is applied on nonlinear dielectric, particle displacement u is acquired by iteration twice
Approximate solution:
Wherein ω is angular frequency, and k is wave number, and the expression formula of nonlinear parameter can be determined according to above formula:
Since k and x is constant, measurement and calculating for convenience in engineering uses the simplified expression of non-linear ultrasonic parameter:
4. a kind of lossless detection method of high martensitic chromium heat resisting steel connector creep hole damage as described in claim 1,
It is characterized in that: the establishment process of model of fit in the step 3 are as follows: by studying under different creep impairment states, non-linear super
The corresponding relationship of sound parameter and welding point creep hole, fitting have obtained following relational model:
Wherein, x is the area fraction of creep hole in field range, and β is the nonlinear parameter of material, C1, t1, β0For constant.
5. being applied to a kind of the lossless of the described in any item high martensitic chromium heat resisting steel connector creep hole damages of claim 1-4
The non-destructive testing device of detection method, it is characterised in that: including ultrasonic pulse generator, output impedance, attenuator, duplexer,
Filter, ultrasonic transducer and oscillograph, the ultrasonic pulse generator is for exciting high energy radio frequency (RF) impulse train, super
The output port of acoustic pulse generator is sequentially connected output impedance, attenuator, duplexer, filter and ultrasonic transducer hair
Penetrate probe, the output impedance is used to guarantee that the characteristic impedance of singal source resistance and connect transmission line to be equal in magnitude and phase phase
Together, attenuator is used to bear the decaying of output power；Generated noise signal when duplexer is for removing system pulses transmitting；
Filter is then used to filter other frequency components, guarantees the pure property of emission signal frequency, in the reception of ultrasonic pulse generator
Port connects the receiving transducer of ultrasonic transducer, receives basic wave signal and second harmonic signal with this, sends out in ultrasonic pulse
An oscillograph is connected on the external interface of raw device, for observing the waveform for receiving signal in time domain scale, present apparatus ultrasound
Using normal beam technique (hair one is received), measured sample is placed between transmitting probe and receiving transducer the mode of signal transmitting,
It is coupled before measurement with ultrasonic coupling agent.
6. a kind of non-destructive testing device of high martensitic chromium heat resisting steel connector creep hole damage as claimed in claim 5,
Be characterized in that: the output voltage of the ultrasonic pulse generator is not less than 450V, and output power is not less than 500W.
7. a kind of non-destructive testing device of high martensitic chromium heat resisting steel connector creep hole damage as claimed in claim 5,
Be characterized in that: the transmitting probe of the ultrasonic transducer and the frequency of receiving transducer are respectively 2.5-5MHz and 5-10MHz.
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| CN111442869A (en) * | 2020-04-30 | 2020-07-24 | 北京理工大学 | Nonlinear ultrasonic detection method for axial stress of bolt |
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| CN113740432A (en) * | 2021-09-13 | 2021-12-03 | 天津市特种设备监督检验技术研究院(天津市特种设备事故应急调查处理中心) | Method for detecting connection quality in transient liquid phase connection |
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| CN111141611A (en) * | 2020-01-20 | 2020-05-12 | 中国特种设备检测研究院 | Test block assembly for creep damage ultrasonic nondestructive testing and preparation method thereof |
| CN111442869A (en) * | 2020-04-30 | 2020-07-24 | 北京理工大学 | Nonlinear ultrasonic detection method for axial stress of bolt |
| CN111639145A (en) * | 2020-06-19 | 2020-09-08 | 国电锅炉压力容器检验有限公司 | Method for evaluating service life of moving blade at hot end of gas turbine |
| CN113358699A (en) * | 2021-05-20 | 2021-09-07 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Boiler tube aging degree rapid evaluation method based on signal group delay measurement |
| CN113358699B (en) * | 2021-05-20 | 2022-06-24 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Boiler tube aging degree rapid evaluation method based on signal group delay measurement |
| CN113740432A (en) * | 2021-09-13 | 2021-12-03 | 天津市特种设备监督检验技术研究院(天津市特种设备事故应急调查处理中心) | Method for detecting connection quality in transient liquid phase connection |
| CN113740432B (en) * | 2021-09-13 | 2024-04-30 | 天津市特种设备监督检验技术研究院(天津市特种设备事故应急调查处理中心) | Method for detecting connection quality in transient liquid phase connection |
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