JPH03242528A - Method and system for diagnosing residual life - Google Patents

Abstract

PURPOSE:To achieve a higher reliability of a high temperature member by calculating a residual life based on an addition of a fatigue life consumption, a creep life consumption and a life consumption caused by embrittlement of the high temperature member. CONSTITUTION:A life consumption and a creep life consumption of a high temperature member and a degree of embrittlement are calculated by a life consumption calculating means composed of a CPU 61 and a RAM 62 from respective measured values. In this case, as the respective values are obtained at a fixed location of the high temperature member, there is little environmental change between forms of damages, which enables the evaluation of the forms of damages almost equivalently. Thus, deterioration is determined as caused by a fatigue damage, a creep damage and embrittlement to obtain a residual life of the high temperature member subject to a repeated load allowed for all life consumption attributed to these forms of damages thereby enabling the recognizing of a comprehensive residual life of the high temperature member.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method and system for diagnosing the remaining life of a high-temperature member subjected to repeated loads.

[Prior Art] An example of a high-temperature member subjected to repeated loads is a steam turbine in a thermal power plant. The main components of a steam turbine are generally designed and manufactured based on a 1,100,000 hour creep rupture strength.

However, in recent years, more than half of the steam turbines in operation have been operating for over 100,000 hours. In addition, the operating pattern of thermal power plants has changed, the frequency of starting and stopping steam turbines has increased, and the components of steam turbines have deteriorated over time.

Therefore, a method for accurately diagnosing the remaining life of steam turbine components is expected.

Conventionally, methods for diagnosing the remaining life of high-temperature parts that are subject to repeated loads include detecting the surface microcrack size of the high-temperature parts using a microscope, etc., and calculating the remaining fatigue life from this value. There are many diagnostic methods, such as measuring with a meter and calculating the remaining creep life from this value.

[Problems to be Solved by the Invention] However, all of these conventional techniques are methods for diagnosing remaining life independently for each type of damage, and although it is possible to determine the remaining life of the damage type being measured, ,
In the case of high-temperature components that are subjected to repeated loads, fatigue damage, creep damage, and embrittlement occur, making it impossible to recognize the original remaining life of the high-temperature component and making it impossible to improve the reliability of the high-temperature component. be.

In particular, in the case of steam turbines that have been in operation for more than 100,000 hours, if we only know the remaining life of a particular type of damage, and if we continue to operate, there is a risk of rupture due to other types of damage. This could potentially lead to a loss of plant safety.

The present invention has been made by focusing on such conventional problems, and it is possible to recognize the original remaining life of high-temperature parts that are subject to fatigue damage, creep damage, and embrittlement, and improve the reliability of high-temperature parts. The purpose of the present invention is to provide a method and system for diagnosing remaining life that can increase the remaining life.

[Means for Solving the Problem] In order to achieve the above object, the present application provides the following invention.

The invention related to a method for diagnosing remaining life consists of determining fatigue life consumption, creep life consumption, and
The life consumption due to embrittlement is measured, and the remaining life is calculated based on the sum of the fatigue life consumption, the creep life consumption, and the life consumption due to embrittlement. It is.

Another invention related to a method for diagnosing remaining life is to determine fatigue life consumption, creep life consumption, and
The degree of embrittlement is measured, and the relationship between the fatigue life consumption, the degree of embrittlement, and the fatigue life determined in advance, and the measured fatigue life consumption and the degree of embrittlement are used to calculate fatigue with embrittlement taken into account. Calculate the lifespan, calculate the fatigue life consumption rate considering embrittlement from the fatigue life considering the embrittlement, and the measured fatigue life consumption, and calculate the creep life consumption and the degree of embrittlement determined in advance. From the relationship between and the creep life, the measured creep life consumption and the degree of embrittlement, calculate the creep life considering embrittlement, and calculate the creep life considering the embrittlement and the measured creep life consumption. From this, calculate the creep life consumption rate taking embrittlement into consideration, and calculate the overall remaining life of the high-temperature member based on the fatigue life consumption rate taking embrittlement into consideration and the creep life consumption rate taking embrittlement into consideration. This method is characterized by calculating .

Here, the fatigue life consumption, the creep life consumption, and the degree of embrittlement are determined by first measuring the fatigue life consumption at a predetermined position of the high-temperature member, and then determining the fatigue life consumption at a predetermined position of the high-temperature member.

The creep life/r4 after polishing the predetermined position
Preferably, the degree of embrittlement is measured after the predetermined position is further polished.

The invention related to the remaining life diagnosis system also provides a life consumption t#J constant means for measuring fatigue life consumption, creep life consumption, and life consumption due to embrittlement of a high-temperature member; and a remaining life calculating means for calculating a comprehensive remaining life based on the sum of the creep life consumption and the life consumption due to embrittlement.

Another invention related to the remaining life diagnosis system is to calculate fatigue life consumption, creep life consumption, and embrittlement degree from respective measurement values for calculating fatigue life consumption, creep life consumption, and embrittlement degree. life consumption calculation means for calculating the degree of
The relationship between fatigue life consumption, degree of embrittlement, and fatigue life that is determined in advance.

From the calculated fatigue life consumption and the degree of embrittlement, a fatigue life that takes embrittlement into account is determined, and from the fatigue life that takes embrittlement into consideration and the measured fatigue life consumption, embrittlement is taken into account. A fatigue life consumption rate calculation means for calculating a fatigue life consumption rate, a predetermined relationship between the creep life consumption, the degree of embrittlement, and the creep life, and the measured creep life consumption and the degree of embrittlement. , a creep life consumption rate calculation means for calculating a creep life taking embrittlement into consideration, and calculating a creep life consumption rate taking embrittlement into consideration from the creep life taking embrittlement into consideration and the measured creep life consumption. and,
Remaining life calculating means for calculating the overall remaining life of the high-temperature member based on the fatigue life consumption rate taking embrittlement into consideration and the creep life consumption rate taking embrittlement into consideration. It is.

Note that the fatigue life consumption amount has a certain correspondence with this and may be anything that substantially represents the fatigue life consumption amount, for example, values such as surface microcrack size or surface hardness of a high-temperature member. may also be used.

Further, the creep life consumption amount and the embrittlement degree may be anything that substantially represents them, and the creep life consumption amount may include cavity density, electrical resistance ratio, etc. Values such as surface transition temperature, grain boundary groove depth, critical crack size, critical cavity density, etc. may be used.

[Function] The life consumption, creep life 'lI4 cost and degree of embrittlement of the high temperature member are calculated from the respective measured values by the life consumption amount calculation means.

When measuring these measured values, fatigue damage occurs on the surface of the member, so first, the measured value for fatigue life consumption is measured at a predetermined position on the surface of the high-temperature member.

Next, predetermined locations on the hot member are polished before measurements are taken for creep life consumption. This is because the main deterioration factor for creep damage is grain boundary damage inside the high-temperature member.

Finally, after further polishing the predetermined position, a measurement value for the degree of embrittlement is measured. This is because the embrittlement mechanism is caused by the segregation of phosphorus at grain boundaries, and there is a risk that the amount of phosphorus segregation cannot be accurately determined due to chemical reactions such as oxidation and decarburization in the surface layer.

In this way, by taking each measurement value from a fixed location on the high-temperature member, there is almost no change in the environment between each damage type, and each damage type can be evaluated almost equally.

There is a certain relationship between the fatigue life consumption, the degree of embrittlement, and the fatigue life for each type of high-temperature member, and when the fatigue life consumption and the degree of embrittlement are given, the fatigue life consumption rate calculation method can calculate the The fatigue life is calculated taking into account the Fatigue life that takes embrittlement into account takes into account deterioration of the member due to embrittlement, so it is shorter than simple fatigue life. Then, a fatigue life consumption rate taking embrittlement into consideration is calculated from the fatigue life taking embrittlement into consideration and the fatigue life consumption amount.

The creep life consumption rate calculation means also calculates the creep life consumption rate in consideration of embrittlement from the creep life consumption amount and the degree of embrittlement, in substantially the same way as the fatigue life consumption rate calculation means.

The overall remaining life of the high-temperature member is calculated by the remaining life calculation means from the fatigue life consumption rate taking embrittlement into consideration and the creep life consumption rate taking embrittlement into consideration.

This remaining life is a value that takes into account the forms of human damage to high-temperature members subjected to repeated loads, that is, fatigue, creep, and embrittlement.

(The following is a blank space) [Example] An example of the present invention will be described below based on FIGS. 1 to 14.

The remaining life diagnosis system will be explained based on FIG. 3.

The remaining life diagnosis system includes an optical microscope 51 that detects surface microcracks of a replica of the object to be diagnosed, a scanning electron microscope @52 that detects the grain boundary cavity density of the replica, and a grain boundary corrosion groove depth. A laser microscope 53 and a T
V camera 55, and a remaining life diagnosis device 60 that processes image data obtained from the TV camera 55 to calculate the remaining life.
It is configured to include an interface 54 that converts image data from a TV camera 55 into a digital signal and outputs it to a remaining life diagnosis device 60.

The remaining life diagnosis device 60 includes a CPU 61 that performs various calculations and controls various devices, a RAM 62 that stores various programs for calculations, and a floppy disk device 63.
It is composed of an optical disk device 64 that stores image data etc. from various microscopes 51, 52, 53, a ROM 65 that stores a startup program, a keyboard 66, a display device 67, and a printer 68. .

In the RAM 62, a program for removing image noise,
A program that calculates microcrack dimensions, grain boundary cavity density, and grain boundary groove depth from image data, evaluation master curve,
A program that calculates the life consumption rate from the master curve.
Then, a program for calculating the remaining lifespan and the like are stored from the floppy disk device 63.

The printer 68 outputs various calculated values.

The display device 67 has a microscope fi5↓, 52°53
Various calculated values are displayed along with the image data from.

Note that the lifetime consumption measurement means includes an optical microscope 51, a scanning electron microscope @ 52, a laser microscope 53, an interface 54, a RAM 62 in which various programs are stored, and operates based on the program to calculate the lifetime consumption from image data. It is composed of a CPU 61 and a CPU 61.

In addition, the life consumption calculation means is CPtJ61 and RAM6.
It is composed of 2.

The fatigue life consumption rate calculation means, the creep life consumption rate calculation means, and the remaining life calculation means are also used in the RA where various programs are stored.
M62, and based on the above program, the fatigue life consumption rate,
It is composed of a CPU 61 that calculates the creep life consumption rate and the remaining life.

Next, the remaining life calculation method and the operation of the remaining life diagnosis system will be explained based on FIGS. 1, 2, and 4 to 14.

Data sampling of component damage and embrittlement.

The replica method is used (step 1). In this embodiment, the data sampling location is the heat group section (HG section) of the first stage high-pressure steam turbine.

Replica collection is performed in the following steps, as shown in FIG.

As shown in FIG. 4, a scale layer 70 is formed in the HG section of the first stage of the high pressure steam turbine, so this is removed (step 1-1). Then, the surface 72 of the base material 71
Collect replicas for fatigue damage evaluation from (Step 1)
-2).

Next, as shown in FIG. 5, the surface 72 is polished to a mirror-polished surface 73 (step 1-3). This mirror-polished surface 73 is subjected to a surface corrosion treatment using a corrosive solution such as 5% nital (step 1-4) to facilitate observation of the metal structure. A replica for creep damage evaluation is collected from the corrosion-treated mirror-polished surface 73 (
Steps 1-5).

Furthermore, the mirror-polished surface 73 that has been subjected to the corrosion treatment is alumina buff-polished until the surface roughness is approximately 0.02 μm (step 1-6). After completion of the puff polishing, the surface of the member is immersed in a saturated aqueous solution of picric acid for 2 to 3 hours to perform a surface corrosion treatment (Step]-7).

After this corrosion treatment, one surface is washed and a replica is taken for evaluation of the degree of embrittlement (step 1-8).

In this way, by collecting replicas from certain locations on the object to be evaluated, there is almost no change in the environment between each damage form, and each damage form can be evaluated approximately equally.

In addition, the reason why a replica for fatigue evaluation is taken first is because fatigue damage occurs on the surface of the member, and the replica for creep evaluation is taken next because grain boundary damage inside the evaluation object is taken. This is because it is the main deterioration factor. Finally, a replica is collected for evaluation of the degree of embrittlement because the embrittlement mechanism is caused by segregation of phosphorus at grain boundaries, so chemical reactions such as oxidation and decarburization occur in the surface layer to accurately measure the amount of phosphorus segregation. This is because there is a risk that it may not be possible to grasp the

The replica for fatigue evaluation, the replica for creep evaluation, and the replica for embrittlement evaluation are each equipped with an optical microscope 51,
It is magnified by a scanning electron microscope 52 and a laser microscope 53 and sent as image data from a TV camera 55 to a remaining life diagnosis device 60 via an interface 54 (
Step 2゜3.4). At this time, the image data is processed by the remaining life diagnosis device 60, so the interface
At step 54, the signal is converted into a digital signal.

Fatigue evaluation is performed based on the surface microcrack size of the replica for fatigue evaluation.

The image data of the replica for fatigue evaluation is stored in the optical disk device 64, and as shown in FIG. 6, noises such as oxide film unevenness and artificial scratches other than one surface microcracks are removed. Noise removal.

Through image processing methods such as binarization processing and contrast processing,
It will be done.

From some image data from which noise has been removed, only the maximum crack size in the field of view is grasped, and the plurality of maximum crack sizes are statistically processed to obtain a representative crack size aid (step 5).

Since the crack size and the fatigue life consumption rate without considering embrittlement have a relationship as shown in the master curve shown in FIG. 9, the fatigue life consumption rate without consideration of embrittlement is calculated from this master curve. The representative crack size aH and the fatigue life consumption rate without considering embrittlement are displayed on the display device 67 and printed on the printer 68.

On the other hand, m fU degree evaluation is performed based on the intergranular corrosion groove depth of the replica for embrittlement degree evaluation.

The image data of the replica for evaluating the degree of embrittlement is stored in the optical disk device 64 in the same way as the image data of the replica for fatigue evaluation, and as shown in FIG. 7, noise is removed.

A peak value of roughness is determined from the image data from which noise has been removed, and this value becomes the representative grain boundary groove depth g, □ (step 6).

Further, the creep evaluation is performed based on the cavity density of the replica for creep evaluation.

The image data of the creep evaluation replica is stored in the optical disk 64 as described above, and as shown in FIG. 8, noise is removed, and the cavity density d, □ is determined from this image data (step 7). Since the cavity density and the creep life consumption rate without consideration of embrittlement have a relationship as shown in the master curve shown in FIG. 10, the creep life consumption rate without consideration of embrittlement is calculated from this master curve. The cavity density di1 and the creep life consumption rate without consideration of embrittlement are displayed on the display device 67 and printed on the printer 68.

From the grain boundary groove depth gd□, the critical crack size ac and critical cavity density dc are determined (step 8.9). Here, critical crack size a. and critical cavity density d.

is the crack size and cavity density that are considered to be the lifetime of the member.

The critical crack size aC is calculated as follows.

The depth of the grain boundary groove and the fracture surface transition temperature (FATT) of the material are as follows:
Since there is a certain relationship as shown in FIG. 11, F and A T T are obtained from the grain boundary groove depth, and the fracture toughness value KIc is calculated by a linear equation.

K+c=C1+C2exp(C,(T-FATT)
) Here, C1, C2, and C3 are constants, and T is the temperature.

From the calculated fracture toughness value +c and stress σ, the following formula is used:
Critical crack size a. is calculated.

ac=(K+c2·F)/a Here, F is a shape factor determined by the shape of the member and the shape of the crack.

Further, the critical cavity density dc is inversely proportional to FATT, so it is calculated from the previously determined FATT.

From the calculated critical crack size ac and representative crack size azl, the fatigue life Nf and fatigue life consumption rate Φ1 considering embrittlement are calculated.
1 is calculated as follows (step 10).

As shown in FIG. 12, the cumulative amount of fatigue damage increases as the number of load repetitions increases, as shown by fatigue damage curve F in the same figure. On the other hand, as embrittlement progresses, the toughness of the member decreases, and the allowable crack size of the member decreases as shown by critical crack size curves BF to HB F 21 in the figure. Therefore, fatigue life becomes shorter when embrittlement is taken into account.

Critical crack size 1 & B Fl T B F2 +...
can be determined experimentally as shown in the following equation by using temperature T and operating time t as parameters.

aC=aC(P-■c) Here, P is P = T (logt +C,),
C4 is a constant.

During fatigue damage! F and critical crack dimension direction Jl! B F□,B
F2°... is stored in advance in the RAM 62 of the remaining life diagnosis device 60, and the number of repetitions N1 at the time of diagnosis is first determined from the representative crack size a1□ and the fatigue damage curve F. Next, critical crack dimension direction 1lAB F□, BF2. ···teeth,
Since a plurality of curves can be drawn depending on the temperature T, the critical crack size direction 1lAB F 2 is determined from the calculated critical crack size aC and the number of repetitions N□. Then, from the intersection of the determined critical crack dimension direction gBp2 and the fatigue damage curve F, the fatigue life Ni is determined in consideration of embrittlement.

Here, in order to improve the accuracy of the critical crack size curve BF2 and the fatigue damage curve F, it is necessary to measure the number of load cycles N1 and the temperature T, or to use the critical crack size and representative crack size from the previous inspection. It is best to memorize these values, correct the curve using these values, and then calculate the fatigue life.

The fatigue life consumption rate Φ1, which takes embrittlement into consideration, is determined by the following formula.

ΦB = N, / N t From this fatigue life consumption rate Φf1, the remaining fatigue life maf in consideration of embrittlement is calculated using the following formula (step 12).

'F i = 1-Φ1, From the calculated critical cavity density dc and the measured cavity density d, □, the creep life t considering embrittlement
z and creep life consumption rate Φ. , etc., is calculated as follows (step 11).

As shown in FIG. 13, creep damage increases as the load time increases, as shown by creep damage curve C in the same figure. On the other hand, as mentioned above, as embrittlement progresses, the toughness of the member decreases, so the allowable cavity density of the member is reduced by the limit cavity density curves Bcm and B in the same figure.
It decreases as shown in C2, . Therefore, the creep life is also shortened when embrittlement is taken into account.

Creep damage curve C and critical cavity density curve BC
BC21... is stored in advance in the RAM 62 of the remaining life diagnosis device 60, and is the measured cavity density di.
, and the creep damage curve C.

First, the load time t1 at the time of diagnosis is determined. Next, the critical cavity density curve B Ct+ BC21... is determined by the temperature T
Since it is possible to draw a plurality of curves, the limit cavity density curve Bc is determined from the calculated limit cavity density dc and the load time t□. Then, from the intersection E of the determined critical cavity density curve Bcz and the creep damage curve C, the creep life t, taking embrittlement into consideration, is determined.

Here, in order to improve the accuracy of the limit cavity density curve Be and the creep damage curve C, it is necessary to measure the load time L1 and temperature T, or to check the limit cavity density and cavity density obtained during previous steam turbine inspection. It is a good idea to memorize these values, correct the curve using these values, and then calculate the creep life.

Creep life consumption rate Φ considering embrittlement. , is determined by a linear equation, and ΦC□” t , / t t From this creep life consumption rate Φc1, the remaining creep life considering embrittlement is calculated by the following equation (Step 1
3).

vo=↓−Φ. , From the calculated fatigue life consumption rate Φ11 considering embrittlement and creep life consumption rate ΦC, the overall remaining life of the member is determined by the following equation (step 14).

! =1-(Φf1+Φ.,) As shown in Fig. 14, the sum of the fatigue life consumption rate Φ1□ and the creep life consumption rate ΦC□ considering embrittlement is D i c
If we take this D□0 on the vertical axis and the load time t on the horizontal axis, then compared with Figures 12 and 13, the overall remaining life ma is the remaining life for each damage type. It can be seen that it is shorter than the

Fatigue life N, taking into account embrittlement, calculated as above,
, Fatigue life consumption rate Φ50, Fatigue remaining life qf, Creep life t4 considering embrittlement, Creep life consumption rate Φc1,
Creep remaining life! . , the overall remaining life map are sequentially displayed on the display device 67 and printed on the printer 68.

Based on the calculated overall remaining life, decide whether to repair or replace high-temperature components, change the operating mode of the steam turbine plant, or when to conduct the next inspection (step 15). .

When determining the operating mode of a steam turbine plant, it is necessary to determine which form of damage is progressing based on the fatigue life consumption rate that does not take into account embrittlement, the creep life consumption rate that does not take into account embrittlement, and FATT, which indicates the degree of embrittlement. After that, decide on the driving mode.

The calculated overall remaining life ma takes into account all forms of damage to high-temperature components subjected to cyclic loads, that is, fatigue damage, creep damage, and deterioration due to embrittlement, so that the high-temperature components are effectively The safety of the steam turbine plant can be improved by knowing how long to keep it.

In this example, the grain boundary groove depth is obtained by processing image data from a laser microscope, but it may also be obtained directly by a roughness meter).

In addition, in this example, the value representing fatigue life consumption is 1
Although the surface microcrack size is used, the surface hardness of the high temperature member may also be used. Furthermore, the electrical resistance ratio of the high-temperature member may be used as the value representing the creep life consumption.

[Effects of the Invention] According to the present invention, the remaining life of high-temperature members subjected to repeated loads can be determined by understanding deterioration due to fatigue damage, creep damage, and embrittlement, and taking into account all life consumption due to these forms of damage. , the overall remaining life of the high-temperature member can be recognized and the reliability of the high-temperature member can be improved.

[Brief explanation of drawings]

Figure 1 is a flowchart for calculating the remaining lifespan, Figure 2 is a flowchart for replica collection, Figure 3 is a block diagram of the remaining lifespan diagnosis system, and Figures 4 and 5 are the main points of the high-temperature parts where replicas are collected. 6 is an explanatory diagram showing image data for fatigue evaluation, FIG. 7 is an explanatory diagram showing image data for embrittlement evaluation, and FIG. 8 is an explanatory diagram showing image data for creep evaluation. , FIG. 9 is a graph showing the relationship between surface crack size and fatigue life consumption rate, FIG. 10 is a graph showing the relationship between grain boundary cavity density and creep life consumption rate,
FIG. 11 is a graph showing the relationship between grain boundary groove depth and FATT, FIG. 12 is a graph showing the relationship between crack length and load repetition rate, and FIG. 13 is a graph showing the relationship between cavity density and loading time. FIG. 14 is a graph showing the relationship between damage rate and load time. 51... Optical microscope, 52... Scanning electron microscope, 5
3. Laser microscope, 55...TV camera, 60...
Remaining life diagnosis device, 61...CPU, 62...RAM
, 63... Floppy disk device, 64... Optical disk device. 1st r! A

Claims (1)

[Claims] 1. A method for diagnosing the remaining life of a high-temperature member subjected to repeated loads, comprising: measuring fatigue life consumption, creep life consumption, and life consumption due to embrittlement of the high-temperature member; A remaining life diagnosis method, comprising calculating the remaining life based on the sum of the life consumption, the creep life consumption, and the life consumption due to embrittlement. 2. In a method for diagnosing the remaining life of a high-temperature member subjected to repeated loads, the fatigue life consumption, creep life consumption, and degree of embrittlement of the high-temperature member are measured, and the fatigue life consumption and embrittlement determined in advance are determined. From the relationship between the degree of embrittlement and fatigue life, the measured fatigue life consumption and the degree of embrittlement, determine the fatigue life that takes embrittlement into account, and calculate the fatigue life that takes embrittlement into consideration and the measured fatigue life. From the consumption amount,
The fatigue life consumption rate considering embrittlement is calculated, and the relationship between the creep life consumption, the degree of embrittlement, and the creep life determined in advance, and the measured creep life consumption and the degree of embrittlement are used to calculate the fatigue life consumption rate. From the creep life considering the embrittlement and the measured creep life consumption, calculate the creep life consumption rate taking the embrittlement into consideration, and calculate the fatigue life taking the embrittlement into consideration. A method for diagnosing remaining life, comprising calculating a comprehensive remaining life of the high-temperature member based on a consumption rate and a creep life consumption rate that takes into account the embrittlement. 3. Correct the relationship between the fatigue life consumption, the degree of embrittlement, and the fatigue life determined in advance by using two or more fatigue life consumption amounts and degrees of embrittlement measured at different times, and then calculate the embrittlement. 3. The remaining life diagnosis method according to claim 2, characterized in that the fatigue life taken into consideration is determined. 4. Correct the relationship between the creep life consumption, the degree of embrittlement, and the creep life determined in advance by using two or more creep life consumption values and degrees of embrittlement measured at different times, and then calculate the embrittlement. The method for diagnosing remaining life according to claim 2 or 3, characterized in that the creep life is determined in consideration of creep life. 5. The order of measuring the fatigue life consumption, the creep life consumption, and the degree of embrittlement is as follows: First, the fatigue life consumption at a predetermined position of the high-temperature member is measured, and then the predetermined position is polished. 5. The method for diagnosing remaining life according to claim 2, further comprising: measuring the creep life consumption amount after the above steps are performed, and finally measuring the degree of embrittlement after further polishing the predetermined position. 6. In a remaining life diagnosis system that diagnoses the remaining life of a high-temperature member subjected to repeated loads, the life consumption measurement measures the fatigue life consumption, creep life consumption, and life consumption due to embrittlement of the high-temperature member. and a remaining life calculating means for calculating a comprehensive remaining life based on the sum of the fatigue life consumption, the creep life consumption, and the life consumption due to embrittlement. Remaining life diagnosis system. 7. In a remaining life diagnosis system that diagnoses the remaining life of high-temperature parts subjected to repeated loads, fatigue life consumption and A life consumption calculation means for calculating a creep life consumption and a degree of embrittlement, a predetermined relationship between the fatigue life consumption, a degree of embrittlement, and the fatigue life, and a relationship between the calculated fatigue life consumption and the degree of embrittlement. From the degree of embrittlement, determine the fatigue life considering embrittlement, and from the fatigue life considering embrittlement and the measured fatigue life consumption,
A fatigue life consumption rate calculation means for calculating a fatigue life consumption rate taking embrittlement into consideration; a relationship between a predetermined creep life consumption amount, a degree of embrittlement, and creep life; and a relationship between the measured creep life consumption amount and the creep life consumption rate. Creep life that takes embrittlement into account is calculated from the degree of embrittlement, and creep life consumption rate that takes embrittlement into account is calculated from the creep life that takes embrittlement into consideration and the measured creep life consumption. life consumption rate calculating means; and remaining life calculating means for calculating the overall remaining life of the high temperature member based on the fatigue life consumption rate taking into account the embrittlement and the creep life consumption rate taking the embrittlement into consideration. A remaining lifespan diagnosis system characterized by having: