Ultrasonic Nonlinear Static Parametric Monitoring Method for Creep Damage in High-Temperature Alloy Components

Abstract

This invention provides an ultrasonic nonlinear static parameter monitoring method for creep damage in high-temperature alloy components, specifically relating to the field of materials monitoring technology. The method includes: S1. Deploying an ultrasonic probe; S2. Determining the emission frequency at the excitation end; S3. Calculating the signal incident angle and emission angle; S4. Exciting fundamental frequency ultrasonic waves; S5. Receiving the signal and uploading the acquired signal to a cloud processing system; S6. Performing a fast Fourier transform and calculating the static component nonlinear parameters; S7. Establishing a linear relationship with creep time and constructing a linear quantification model of creep damage; S8. Calculating the static component nonlinear parameters of healthy samples; S9. Using the nonlinear parameters to complete the quantitative analysis of damage. This invention solves the problem that traditional nonlinear ultrasonic methods rely on second harmonic nonlinear parameters, and the phase velocity matching conditions are severely disrupted in the middle and later stages, resulting in a nonlinear response trend. This makes it impossible to determine a unique creep time based on these parameters, and thus a unique damage state.

Description

Technical Field

[0001] This invention patent relates to the field of materials monitoring technology, specifically to an ultrasonic nonlinear static parameter monitoring method for creep damage of high-temperature alloy components. Background Technology

[0002] The creep damage evolution process of high-temperature alloys can be divided into three typical stages: the initial deceleration stage is dominated by dislocation slip, and the strain rate gradually decreases; the steady-state stage forms a dynamic balance between hardening and recovery, characterized by linear strain accumulation; and the final acceleration stage is characterized by exponential increase in strain rate due to the aggregation of grain boundary voids until fracture. During this process, the microstructure gradually evolves from dislocation tangles to an intergranular crack network, posing a significant challenge to material lifetime prediction. Traditional nonlinear ultrasonic methods rely on second-harmonic nonlinear parameters (…). The measurement of the phase velocity was performed, but due to the severe disruption of the phase velocity matching conditions in the middle and later stages, its response exhibited a non-monotonic characteristic of first increasing and then decreasing, forming an underdetermined inverse problem—that is... The creep time exhibits a non-linear trend, making it impossible to determine a unique creep time based on this parameter, and thus to determine the damage state.

[0003] Research shows that using static component nonlinear parameters ( It does not rely on strict phase velocity matching conditions; even in the presence of group velocity mismatch, its linear relationship with dislocation density remains intact. This characteristic stems from the long-range interaction mechanism between the stress field and the defect. The creep exhibits monotonically increasing growth throughout its entire lifespan, and continues to respond, especially during the accelerated crack propagation phase. This characteristic provides a physical basis for online assessment of the entire lifespan of high-temperature components and is expected to solve the challenges of creep monitoring and remaining life prediction for critical engineering components such as aero-engine blades. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention provides an ultrasonic nonlinear static parameter monitoring method for creep damage of high-temperature alloy components, the specific technical solution of which is as follows:

[0005] An ultrasonic nonlinear static parameter monitoring method for creep damage in high-temperature alloy components, specifically including the following steps:

[0006] S1. Determine the positions of the signal excitation end and the signal receiving end on the surface of the component to be monitored, and arrange the ultrasonic probes accordingly;

[0007] S2. Based on the dispersion curve of the component to be monitored, select the frequency on the dispersion curve that matches the group velocity under the zero frequency of mode S0 as the transmission frequency of the signal excitation end.

[0008] S3. Calculate the signal incident angle at the signal excitation end and the signal emission angle at the signal receiving end according to Schnell's law;

[0009] S4. The signal is generated by a signal generator and passed through an attenuator to excite the fundamental frequency ultrasonic waves in the component to be monitored through the ultrasonic probe at the signal excitation end;

[0010] S5. The signal is received by the signal receiver and transmitted to the oscilloscope after being amplified. The oscilloscope collects the signal and uploads it to the cloud processing system.

[0011] S6. The cloud processing system performs a Fast Fourier Transform on the received signal to extract the amplitude of the static component. With fundamental amplitude And calculate the static component nonlinear parameters. ,in, ;

[0012] S7. Establish static component nonlinear parameters With creep time The linear relationship is used to construct a linear quantification model of creep damage;

[0013] S8. Calculate the static component nonlinear parameters of the healthy specimen. As a benchmark, Normalization is performed, and nonlinear parameters are calculated. ;

[0014] S9. Based on static component nonlinear parameters With creep time The linear relationship, using nonlinear parameters To determine the degree of creep damage and its lifespan stage, and to complete the quantitative analysis of damage.

[0015] Preferably, in S1, the high-temperature alloy material used in the component to be monitored meets the requirement that the dislocation multiplication rate is 10³ to 10⁻⁶ in an environment of 550℃ to 900℃. 4 / m²·s; the signal excitation end uses an industrial probe with a center frequency of 5MHz and a bandwidth ≥3MHz to transmit Hanning window modulated waves; the signal receiving end uses a low-frequency probe with a center frequency of 0.5MHz±5%; the installation distance between the signal excitation end and the signal receiving end... satisfy Among them, wavelength , The phase velocity is the frequency of the signal excitation terminal. This is the transmission frequency of the signal excitation terminal.

[0016] Preferably, in S3, the signal incident angle of the signal excitation end is calculated using the phase velocity of the transmission frequency of the signal excitation end; the signal emission angle of the signal receiving end is calculated using the phase velocity at zero frequency of mode S0.

[0017] Preferably, in S4, the signal generator is a RAM-5000SNAP nonlinear high-energy ultrasonic testing system; the adjustable attenuation range of the attenuator is 10-60dB, and the SNR is ≥20dB.

[0018] Preferably, in S5, the amplifier is a low-noise amplifier with a fixed gain of 60dB; the cloud processing system includes a fast Fourier transform module, a parameter extraction module, a data processing module, and a wireless communication module; the signal excitation end, signal receiving end, signal generator, attenuator, amplifier, and oscilloscope are all electrically connected to the cloud processing system.

[0019] Preferably, in S7, the static component nonlinear parameter With creep time The linear relationship is:

[0020] ;

[0021] In the formula, , It is a linear fitting constant;

[0022] Among them, at each creep time point, The signal excitation and signal reception yielded the following results: The nonlinear parameters of each static component are calculated and their variances are determined to ensure that the nonlinear parameters of the static components at each creep time point are consistent. The error is controlled within ±5%, and the time resolution reaches 0.1 hours.

[0023] More preferably, in S8, a healthy sample made of the same material as the component to be monitored is selected, and the operations in S1-S6 are repeated to calculate the static component nonlinear parameters of the healthy sample. As a benchmark.

[0024] More preferably, in S9, the nonlinear parameters obtained in S8 are used. The determination of the degree of creep damage and its lifespan stage is specifically divided into the following four stages:

[0025] Phase I: When 1 < When the value is ≤1.2, the component under monitoring is in the early stage of creep, at which time dislocation slip is dominant;

[0026] Phase II: When 1.2 < When the value is ≤1.4~1.5, the component under monitoring is in the middle stage of creep, and the precipitated phase coarsens.

[0027] Phase III: When When the value is >1.4 to 1.5, the component under monitoring is in the late stage of creep, where micropores coalesce, and microcracks form and propagate.

[0028] End of Stage III: When the static component nonlinear parameter The parameter begins to decrease, i.e., the nonlinear parameter. As the descent begins, macroscopic cracks form, and the component begins to fracture and fail. At this point, the component under monitoring is in the final stage of Phase III.

[0029] The beneficial effects of this invention are:

[0030] Compared to traditional nonlinear ultrasound methods that rely on second harmonic nonlinear parameters The monitoring method of this invention utilizes static component nonlinear parameters. It does not rely on strict phase velocity matching conditions; even in the presence of group velocity mismatch, its linear relationship with dislocation density remains intact. This characteristic stems from the long-range interaction mechanism between the stress field and the defect. The creep exhibits a monotonically increasing linear trend throughout the creep cycle, and continues to respond, especially during the later stages of accelerated creep when crack propagation occurs. This parameter allows for the determination of a unique creep time and the corresponding damage state, providing a basis for online assessment of the entire lifespan of high-temperature alloy components. Attached Figure Description

[0031] The accompanying drawings constituting this invention are provided to further understand this application and do not constitute an undue limitation of this application.

[0032] Figure 1 This is a schematic diagram of the main components of the monitoring method of the present invention;

[0033] Figure 2 This is a schematic diagram of the monitoring method provided by the present invention;

[0034] Figure 3 This is a graph showing the trend of HP40 alloy as a monitored component changes with creep time in the embodiment; where, Figure 3 (a) shows the traditional second harmonic nonlinear parameter. Trend graph of creep time; Figure 3 (b) represents the static component nonlinear parameter provided by this invention. Trend graph of creep time;

[0035] Figure 4 This is a graph showing the trend of the monitored component, P92 alloy, over creep time in the embodiment; wherein, Figure 4 (a) shows the traditional second harmonic nonlinear parameter. Trend graph of creep time; Figure 4 (b) represents the static component nonlinear parameter provided by this invention. Trend graph of creep time;

[0036] Figure 5 Nonlinear parameters in the embodiments A linear relationship between creep time and creep time; where, Figure 5 In the middle (a), the nonlinear parameters of the HP40 alloy component are shown. Linear relationship with creep time; Figure 5 (b) represents the nonlinear parameters of the P92 alloy component. Linear relationship with creep time. Detailed Implementation

[0037] The specific implementation of the ultrasonic nonlinear static parameter monitoring method for creep damage of high-temperature alloy components provided by the present invention will be further described with reference to the accompanying drawings and embodiments.

[0038] like Figures 1-2 As shown, an ultrasonic nonlinear static parameter monitoring method for creep damage in high-temperature alloy components specifically includes the following steps:

[0039] S1. Determine the positions of the signal excitation end and the signal receiving end on the surface of the component to be monitored, and arrange the ultrasonic probes accordingly;

[0040] Preferably, in S1, the high-temperature alloy material used in the component to be monitored meets the requirement that the dislocation multiplication rate is 10³ to 10⁻⁶ in an environment of 550℃ to 900℃. 4 / m²·s; the signal excitation end uses an industrial probe with a center frequency of 5MHz and a bandwidth ≥3MHz to transmit Hanning window modulated waves; the signal receiving end uses a low-frequency probe with a center frequency of 0.5MHz±5%; the installation distance between the signal excitation end and the signal receiving end... satisfy Among them, wavelength , The phase velocity is the frequency of the signal excitation terminal. This is the transmission frequency of the signal excitation terminal.

[0041] S2. Based on the dispersion curve of the component to be monitored, select the frequency on the curve that matches the group velocity under the zero frequency of mode S0 as the transmission frequency of the signal excitation end;

[0042] S3. According to Schnell's Law: Calculate the incident angle and the exit angle of the signal respectively;

[0043] in, The longitudinal wave velocity in the wedge is... It is the phase velocity (signal incident angle) at the transmission frequency of the signal excitation end in the material medium or the phase velocity (signal emission angle) at the zero frequency of the S0 mode.

[0044] S4. The signal is generated by a signal generator and passed through an attenuator to excite the fundamental frequency ultrasonic waves in the component to be monitored through the ultrasonic probe at the signal excitation end;

[0045] Preferably, in S4, the signal generator adopts a RAM-5000SNAP nonlinear high-energy ultrasonic testing system. This signal generator has microsecond-level triggering accuracy and, in conjunction with a Hanning window modulation wave, can achieve high time resolution excitation. The adjustable attenuation range of the attenuator is 10-60dB, and the SNR is ≥20dB. In addition, the attenuator also has the following functions: (1) It accurately reduces the signal power through a resistor network to prevent the receiving circuit from overloading or saturating, protect sensitive electronic components, and thus achieve dynamic adjustment of the input signal amplitude; (2) The calibrated attenuator can be used to compensate for system errors (such as cable loss), ensure uniform amplitude measurement benchmark, and optimize measurement accuracy; (3) Noise suppression function.

[0046] S5. The signal is received by the signal receiver and amplified by the amplifier before being transmitted to the oscilloscope. The oscilloscope collects the signal and uploads it to the cloud processing system.

[0047] Preferably, in S5, the amplifier is a low-noise amplifier with a fixed gain of 60dB, which effectively reduces the impact of transmission loss on the results; at the same time, the amplifier can also perform automatic gain control (AGC) to compensate for signal attenuation caused by increased sound path.

[0048] Preferably, the cloud processing system includes a fast Fourier transform module, a parameter extraction module, a data processing module, and a wireless communication module;

[0049] It is worth emphasizing that the signal excitation end, signal receiving end, signal generator, attenuator, amplifier, and oscilloscope are all electrically connected to the cloud processing system.

[0050] S6. The cloud processing system performs a Fast Fourier Transform on the received signal to extract the amplitude of the static component. With fundamental amplitude And calculate the static component nonlinear parameters. ,in, ;

[0051] S7. Establish static component nonlinear parameters With creep time linear relationship ,pass The monotonically increasing characteristic is used to construct a linear quantification model of creep damage; where, , It is a linear fitting constant;

[0052] It is worth noting here that, in order to ensure the nonlinearity of the static component parameters at each creep time point... Errors are controlled within ±5%, with a time resolution of 0.1 hours, and are performed at each creep time point. The signal excitation and signal reception yielded the following results: The nonlinear parameter values ​​of each static component are calculated, and the variance is solved.

[0053] S8. Select another healthy sample made of the same material as the component to be monitored, and repeat the operations in S1-S6 to calculate the static component nonlinear parameters of the healthy sample. As a benchmark, Normalization is performed, and nonlinear parameters are calculated. .

[0054] S9. Based on static component nonlinear parameters With creep time The linear relationship shows that... Similarly, it is related to creep time. Linearly correlated nonlinear parameters. Utilizing nonlinear parameters... To determine the degree of creep damage and its lifespan stage, and to complete the quantitative analysis of damage.

[0055] Preferably, in S9, the degree of creep damage and the lifespan stage are specifically divided into the following four stages:

[0056] Phase I: When 1 < When the value is ≤1.2, the component under monitoring is in the early stage of creep, at which time dislocation slip is dominant;

[0057] Phase II: When 1.2 < When the value is ≤1.4~1.5, the component under monitoring is in the middle stage of creep, and the precipitated phase coarsens.

[0058] Phase III: When When the creep value is >1.4 to 1.5, the monitored component is in the late stage of creep, with micropores coalescing and microcracks forming and propagating; it is worth noting here that... During the accelerated creep phase (stage III), the hourly rate of change exceeds 3%, and a critical damage transition can be captured with a resolution of 0.1 h.

[0059] End of Stage III: When the static component nonlinear parameter The parameter begins to decrease, i.e., the nonlinear parameter. As the descent begins, macroscopic cracks form, and the component starts to fracture and fail. At this point, the component under monitoring is in the final stage of stage III. That is, when the monitored parameters... When the temperature changes from rising to falling, the component to be monitored has entered the countdown to fracture, requiring an early warning and immediate cessation of inspection.

[0060] To better understand the monitoring method provided by this invention, the following description is provided in conjunction with specific embodiments:

[0061] Taking typical high-temperature alloys HP40 (HP40 is a nickel-based cast high-temperature alloy commonly used in equipment such as ethylene cracking furnace tubes and hydrogen conversion furnace tubes; in the aerospace field, HP40 is also used to manufacture high-temperature engine components, such as combustion chamber liners) and P92 (P92 steel is a representative of third-generation martensitic heat-resistant steel, specifically designed for ultra-supercritical thermal power units; this material has been applied in 85% of domestic megawatt-class ultra-supercritical units, especially in the nuclear power field, where P92 is commonly used in fourth-generation sodium-cooled reactor pressure vessels) as examples, according to GB / T 2039-2012 "Metallic Materials Uniaxial Tensile Creep Test Method", a time-sharing loading creep method was used to prepare specimens with different degrees of damage to verify the accuracy of the monitoring structure proposed in this invention. The creep time setting covers the entire creep life cycle.

[0062] On the damaged HP40 sample, the frequency that matches the group velocity at zero frequency of S0 mode in S4 mode is selected as the excitation mode. In this example, the frequency is 4.8MHz, the number of cycles is 5, a 5MHz transducer is used at the signal excitation end, a 0.5MHz transducer is used at the signal receiving end, and the corresponding wedge incident angle is 27.7°.

[0063] On the damaged P92 sample, the frequency that matches the group velocity at zero frequency of S0 mode in S3 mode is selected as the excitation mode. In this example, the frequency is 5.6MHz, the number of cycles is 10, a 5MHz transducer is used at the signal excitation end, a 0.5MHz transducer is used at the signal receiving end, and the corresponding wedge incident angle is 27°.

[0064] Calculate the creep time corresponding to each of the two types of samples above. Values ​​(obtained after multiple variance control errors) and establish static component nonlinear parameters. With creep time Linear relationship, such as Figure 3 (b) and Figure 4 As shown in (b);

[0065] To more intuitively relate to the nonlinear parameters dependent on second harmonics Compared with traditional nonlinear ultrasonic methods, this embodiment also includes the second harmonic nonlinear parameters of the two types of samples. With creep time Linear relationship, such as Figure 3 (a) and Figure 4 As shown in (a);

[0066] Will Figure 3 (a) and Figure 3 (b) Figure 4 (a) and Figure 4 A comparison in (b) shows that the second harmonic nonlinear parameter is dependent on... Traditional nonlinear ultrasound methods exhibit response that varies with creep time. The changes exhibit obvious nonlinear characteristics, especially in the early stages of creep ( ), The creep intensity gradually increases with damage accumulation, exhibiting good monotonicity and sensitivity; however, when creep enters the middle and late stages (after 600 h, fracture occurs around 960 h), due to the proliferation of microcracks, pore connections, and degradation of the elastic modulus within the material, the nonlinear acoustic response exhibits "oversaturation" or scattering enhancement effects, leading to... The signal no longer rises continuously with increasing damage; instead, it exhibits a trend of decline, attenuation, and even fluctuation. In contrast, the signal based on the static component nonlinear parameters... It maintains good monotonic growth characteristics within the same creep stage, that is... The signal increases almost linearly throughout the creep process, and even in the middle and late stages when material properties deteriorate significantly and the macroscopic creep rate accelerates, it can still continuously reflect the cumulative damage.

[0067] Therefore, in A curve will appear with "a Two corresponding The non-unique mapping phenomenon of "" leads to the use of There are ambiguities and potential for misjudgment when assessing creep damage; The curves always maintain a monotonically reversible relationship, and there is no problem of multiple values ​​corresponding, which significantly improves the certainty and accuracy of damage assessment.

[0068] Furthermore, this phenomenon also confirms the difference between the two types of nonlinear parameters from a mechanistic perspective: It is more sensitive to local elastic distortion and modulation effects in materials. When damage develops to a certain critical level, local scattering, interface slip, and inter-crack interactions can cause second harmonic signal distortion. This more directly reflects the overall nonlinear cumulative effect and has a stronger ability to resist local modal disturbances and structural degradation. Therefore, the static component nonlinear parameters... As a key criterion, it is more helpful to achieve stable and reliable creep damage characterization throughout the entire life cycle.

[0069] Select healthy HP40 and P92 samples, and calculate the static component nonlinear parameters of the HP40 and P92 healthy samples respectively. ,right Normalization is performed to obtain nonlinear parameters. Linear relationship with creep time (e.g.) Figure 5 (a) and Figure 5As shown in (b), the monitoring results of the damaged components HP40 and P92 under monitoring are compared with those of the traditional nonlinear monitoring method, as illustrated in Tables 1 and 2 below.

[0070] Table 1 Comparison of damage monitoring results for HP40 alloy (900℃, 33MPa)

[0071]

[0072] Table 2 Comparison of Damage Monitoring Results at P92 (650℃, 115MPa)

[0073]

[0074] In summary, the predicted structural error between the monitoring method provided by this invention and the two samples with known different damage degrees prepared in the examples is less than 8%. That is, the monitoring method provided by this invention effectively avoids the underdetermined inverse problem formed by traditional nonlinear monitoring methods, and can accurately determine the unique creep time and the corresponding damage degree and life stage, providing a basis for online assessment of the full-cycle creep damage state of high-temperature alloy components.

[0075] In this invention, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are merely used to facilitate the description of the structural relationships of the various components or elements of this invention and do not specifically refer to any particular component or element in this invention, nor should they be construed as limiting the invention. Terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of the above terms in this invention based on the specific circumstances, and they should not be construed as limiting the invention.

[0076] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An ultrasonic nonlinear static parameter monitoring method for creep damage in high-temperature alloy components, characterized in that, Specifically, the following steps are included: S1. Determine the positions of the signal excitation end and the signal receiving end on the surface of the component to be monitored, and arrange the ultrasonic probes accordingly; S2. Based on the dispersion curve of the component to be monitored, select the frequency on the dispersion curve that matches the group velocity under the zero frequency of mode S0 as the transmission frequency of the signal excitation end. S3. Calculate the signal incident angle at the signal excitation end and the signal emission angle at the signal receiving end according to Schnell's law; S4. The signal is generated by a signal generator and passed through an attenuator to excite the fundamental frequency ultrasonic waves in the component to be monitored through the ultrasonic probe at the signal excitation end; S5. The signal is received by the signal receiver and transmitted to the oscilloscope after being amplified. The oscilloscope collects the signal and uploads it to the cloud processing system. S6. The cloud processing system performs a Fast Fourier Transform on the received signal to extract the amplitude of the static component. With fundamental amplitude And calculate the static component nonlinear parameters. ,in, ; S7. Establish static component nonlinear parameters With creep time The linear relationship is used to construct a linear quantification model of creep damage; S8. Calculate the static component nonlinear parameters of the healthy specimen. As a benchmark, Perform normalization and calculate nonlinear parameters ; S9. Based on static component nonlinear parameters With creep time The linear relationship, using nonlinear parameters To determine the degree of creep damage and its lifespan stage, and to complete the quantitative analysis of damage.

2. The ultrasonic nonlinear static parameter monitoring method for creep damage of high-temperature alloy components according to claim 1, characterized in that, In S1, the high-temperature alloy material used in the component to be monitored meets the requirement that the dislocation multiplication rate is 10³ to 10⁻⁶ in an environment of 550℃ to 900℃. 4 / m²·s; The signal excitation end uses an industrial probe with a center frequency of 5MHz and a bandwidth of ≥3MHz to transmit Hanning window modulated waves. The signal receiving end uses a low-frequency probe with a center frequency of 0.5MHz±5%; The installation distance between the signal excitation end and the signal receiving end satisfy Among them, wavelength , The phase velocity is the frequency of the signal excitation terminal. This is the transmission frequency of the signal excitation terminal.

3. The ultrasonic nonlinear static parameter monitoring method for creep damage of high-temperature alloy components according to claim 2, characterized in that, In S3, the signal incident angle of the signal excitation end is calculated using the phase velocity of the signal excitation end's transmission frequency; The signal emission angle of the signal receiving end is calculated using the phase velocity at zero frequency of the S0 mode.

4. The ultrasonic nonlinear static parameter monitoring method for creep damage of high-temperature alloy components according to claim 3, characterized in that, In S4, the signal generator adopts the RAM-5000SNAP nonlinear high-energy ultrasonic testing system; The adjustable attenuation range of the attenuator is 10–60 dB, and the SNR is ≥20 dB.

5. The ultrasonic nonlinear static parameter monitoring method for creep damage of high-temperature alloy components according to claim 4, characterized in that, In S5, the amplifier is a low-noise amplifier with a fixed gain of 60dB; The cloud processing system includes a fast Fourier transform module, a parameter extraction module, a data processing module, and a wireless communication module. The signal excitation terminal, signal receiving terminal, signal generator, attenuator, amplifier, and oscilloscope are all electrically connected to the cloud processing system.

6. The ultrasonic nonlinear static parameter monitoring method for creep damage of high-temperature alloy components according to claim 5, characterized in that, In S7, the static component nonlinear parameter With creep time The linear relationship is: ； In the formula, , It is a linear fitting constant; Among them, at each creep time point, The signal excitation and signal reception yielded the following results. The nonlinear parameters of each static component are calculated and their variances are determined to ensure that the nonlinear parameters of the static components at each creep time point are consistent. The error is controlled within ±5%, and the time resolution reaches 0.1 hours.

7. The ultrasonic nonlinear static parameter monitoring method for creep damage of high-temperature alloy components according to claim 6, characterized in that, In S8, another healthy sample made of the same material as the component to be monitored is selected, and the operations in S1-S6 are repeated to calculate the static component nonlinear parameters of the healthy sample. As a benchmark.

8. The ultrasonic nonlinear static parameter monitoring method for creep damage of high-temperature alloy components according to claim 7, characterized in that, In S9, the nonlinear parameters obtained from S8 are used. The determination of the degree of creep damage and its lifespan stage is specifically divided into the following four stages: Phase I: When 1 < When the value is ≤1.2, the component under monitoring is in the early stage of creep, at which time dislocation slip is dominant; Phase II: When 1.2 < When the value is ≤1.4~1.5, the component under monitoring is in the middle stage of creep, and the precipitated phase coarsens. Phase III: When When the value is >1.4 to 1.5, the component under monitoring is in the late stage of creep, where micropores coalesce, and microcracks form and propagate. End of Stage III: When the static component nonlinear parameter The parameter begins to decrease, i.e., the nonlinear parameter. As the descent begins, macroscopic cracks form, and the component begins to fracture and fail. At this point, the component under monitoring is in the final stage of Phase III.

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