WO2015059815A1 - Procédé de prédiction de durée de vie résiduelle au fluage d'un produit détérioré par la chaleur et la pression, et procédé de création de courbe d'étalonnage utilisée dans ledit procédé de prédiction - Google Patents

Procédé de prédiction de durée de vie résiduelle au fluage d'un produit détérioré par la chaleur et la pression, et procédé de création de courbe d'étalonnage utilisée dans ledit procédé de prédiction Download PDF

Info

Publication number
WO2015059815A1
WO2015059815A1 PCT/JP2013/078957 JP2013078957W WO2015059815A1 WO 2015059815 A1 WO2015059815 A1 WO 2015059815A1 JP 2013078957 W JP2013078957 W JP 2013078957W WO 2015059815 A1 WO2015059815 A1 WO 2015059815A1
Authority
WO
WIPO (PCT)
Prior art keywords
product
evaluation range
crack
calibration curve
length
Prior art date
Application number
PCT/JP2013/078957
Other languages
English (en)
Japanese (ja)
Inventor
荒川　大輔
西田　秀高
栄郎 松村
啓司 森下
Original Assignee
中国電力株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中国電力株式会社 filed Critical 中国電力株式会社
Priority to PCT/JP2013/078957 priority Critical patent/WO2015059815A1/fr
Priority to JP2015512418A priority patent/JP5859710B2/ja
Publication of WO2015059815A1 publication Critical patent/WO2015059815A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/20—Metals
    • G01N33/204—Structure thereof, e.g. crystal structure
    • G01N33/2045—Defects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0071—Creep
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/0202—Control of the test
    • G01N2203/0212—Theories, calculations
    • G01N2203/0218—Calculations based on experimental data

Definitions

  • the present invention relates to a method for predicting the remaining creep life of a product deteriorated by heating and pressurization, and a calibration curve creating method used for this prediction method.
  • An object of the present invention is to provide a method for predicting the creep remaining life of a product deteriorated by heating and pressurization, and a calibration curve creating method used for this prediction method.
  • the method for creating a calibration curve used in the method for predicting the remaining creep life of the first product deteriorated by heating and pressurization according to the present invention can be arbitrarily evaluated on the surface of the second product deteriorated by heating and pressurization. Including a step of setting a range and a step of determining whether or not a crack has occurred within the evaluation range.
  • the method of creating a calibration curve used in the method for predicting the remaining creep life of the first product deteriorated by heating and pressurization according to the present invention is arbitrary on the surface of the second product deteriorated by heating and pressurization. And a step of determining whether or not a crack has occurred within the evaluation range, and if there is no crack within the evaluation range, the void is within the evaluation range.
  • a step of obtaining a number density, and a step of creating a calibration curve representing a relationship between the number density of the obtained void and the damage rate of the second product When cracks are generated within the evaluation range, the step of obtaining the number of crystal grains over which the maximum crack generated within the evaluation range spans, and the relationship between the number of crystal grains obtained and the damage rate of the second product And a step of creating a calibration curve representing the first product and the second product may have a bainite structure.
  • the evaluation range it is preferable to set the evaluation range to a location where cracks are likely to occur on the surface of the second product.
  • the maximum crack is cut, if the length of each cut portion is less than a predetermined ratio with respect to the longer length of the two adjacent cracks, the maximum crack is It is preferable to calculate the maximum crack length or the number of crystal grains over which the maximum cracks are considered, assuming that they are not broken. More preferably, the predetermined ratio is half.
  • the first product and the second product are preferably hollow tubes, and may be, for example, boiler piping having a bent portion.
  • the pressurization is preferably an internal pressure.
  • the second product at least two types of products heated at different temperatures and pressurized at different pressures were used, and the number density of voids and the maximum cracks required for each of these at least two types of products were used.
  • a calibration curve may be created based on the length and / or the number of grains that the maximum crack spans. In this case, it is preferable that the lifetimes of at least two types of products are different within 25% of the lifetimes of other products based on the lifetime of the longest product.
  • the method for predicting the remaining creep life of a product deteriorated by heating and pressurization includes a step of setting an arbitrary evaluation range on the surface of the product, and whether or not a crack has occurred within the evaluation range. And determining the number of voids within the evaluation range and determining the product damage rate from the obtained number density of voids. And further comprising a process, In the evaluation range, when a crack has occurred, the method further includes a step of determining the length of the maximum crack generated in the evaluation range, and a step of determining a product damage rate from the obtained maximum crack length, The product is characterized by having a bainite structure.
  • a step of setting an arbitrary evaluation range on the surface of the product and whether cracks are generated within the evaluation range If there is no crack in the evaluation range, the step of obtaining the number density of voids in the evaluation range and the product damage rate from the obtained number density of voids And a process for obtaining In the evaluation range, if a crack has occurred, a step of obtaining the number of crystal grains spanned by the maximum crack generated in the evaluation range and a step of obtaining a product damage rate from the number of obtained crystal grains.
  • the product may have a bainite structure.
  • the evaluation range it is preferable to set the evaluation range to a location where cracks are likely to occur on the product surface.
  • the maximum crack is cut, if the length of each cut portion is less than a predetermined ratio with respect to the longer length of the two adjacent cracks, the maximum crack is It is preferable to calculate the maximum crack length or the number of crystal grains over which the maximum cracks are considered, assuming that they are not broken. More preferably, the predetermined ratio is half.
  • the product is preferably a hollow tube, for example, a boiler pipe having a bent portion.
  • the pressurization is preferably performed by applying an internal pressure to the product.
  • the present invention it is possible to provide a method for predicting the remaining creep life of a product deteriorated by heating and pressurization, and a calibration curve creating method used for this prediction method.
  • FIG. 6 is a graph showing the relationship between the maximum crack length and the sample damage rate when (a) the damage rate is 0 to 1.0 and (b) the damage rate is 0.7 to 1.0 in an embodiment. is there. It is a graph which shows the relationship between the extended M parameter and the damage rate of a sample in one Embodiment.
  • the number density of voids within the evaluation range And a step of creating a calibration curve representing the relationship between the number density of the obtained voids and the damage rate of the second product, If a crack has occurred within the evaluation range, a step for obtaining the length of the maximum crack generated within the evaluation range and a calibration curve representing the relationship between the obtained maximum crack length and the damage rate of the second product
  • the first product and the second product have a bainite structure.
  • the first product and the second product are made of a material having a bainite structure and causing creep deformation by heating and pressing.
  • An example of such a material is cast steel, but is not limited thereto.
  • the first product and the second product are preferably made of the same material.
  • the shape of the first product and the second product is not particularly limited, and can be, for example, a hollow tube, a plate, or a rod, but is preferably a hollow tube.
  • the cross-section of the hollow tube may be any shape, for example, circular, oval, or polygonal, but with a corner if the strength of the hollow tube is taken into account. It is preferably not circular or elliptical, more preferably circular.
  • a boiler pipe having a bent portion As such a hollow tube, for example, a boiler pipe having a bent portion can be cited.
  • boiler piping has been considered to have a ferrite structure or a pearlite structure, and thus the creep remaining life has been predicted according to a method for predicting the creep remaining life of a product having a ferrite structure or pearlite structure.
  • the present inventors have found that the bent portion changes to have a bainite structure with slow cooling when the bent portion of the boiler piping is created. Therefore, if the creep remaining life of a boiler pipe having a bent portion is predicted using the calibration curve created by the calibration curve creating method according to the present invention, the creep remaining life of the boiler pipe can be accurately predicted. It becomes possible.
  • the shape of the first product and the shape of the second product may be the same or different, but are preferably the same or similar, and more preferably the same.
  • the first product and the second product are products deteriorated by being placed under conditions of a constant high temperature and a constant pressure higher than normal pressure, respectively.
  • the temperature range is not particularly limited as long as each product has a bainite structure.
  • the range may be 210 ° C. to 550 ° C., and preferably 350 ° C. to 550 ° C.
  • the heating temperature of the first product and the heating temperature of the second product may be the same or different, but are preferably the same.
  • the pressure range is not particularly limited as long as it is higher than normal pressure (0.1 MPa), but may be, for example, 0.2 MPa to 1000 MPa, preferably 0.3 MPa to 500 MPa, and preferably 0.5 MPa to 300 MPa.
  • the pressure applied to the first product and the pressure applied to the second product may be the same or different, but are preferably the same.
  • the method of applying pressure to the product is not particularly limited, and external pressure may be applied or internal pressure may be applied. However, when each product is a hollow tube, it is preferable to apply the internal pressure. When applying an internal pressure to the second product, it is preferable to deteriorate the second product by an internal pressure creep test.
  • the internal pressure creep test is a method of measuring the lifetime of a hollow tube by applying an internal pressure to the hollow tube in a high-temperature furnace and creeping the hollow tube as necessary.
  • the internal pressure creep test can be performed on the hollow tube itself, including the effects of altered layers such as oxides on the outer surface and inner surface of the hollow tube, which occurs when the hollow tube is used as boiler piping, for example. It is excellent in that it can be tested. Further, since the stress due to the internal pressure is applied to the hollow tube in the same manner as when actually used in the boiler, it is possible to accurately measure the life of the boiler piping.
  • the evaluation range can be set by selecting an arbitrary portion having an arbitrary width on the surface of the second product. Although wide is arbitrary, for example, it may be in the range of 0.3mm 2 ⁇ 1.0mm 2. Moreover, although a selection location is arbitrary, it is preferable that it is a location where a crack is likely to occur on the surface of the second product, and those skilled in the art can obtain such location from empirical rules and calculations. According to the calibration curve creation method according to the present invention, even if the evaluation range is arbitrarily set, the calibration curve with very little error depending on the setting method is applied by applying the maximum crack length to the product having a bainite structure. The advantageous effect that can be created. Therefore, if the calibration curve created in this way is used, the remaining creep life of the first product deteriorated by heating and pressurization can be accurately predicted.
  • the method for determining whether or not a crack has occurred within the set evaluation range is not particularly limited, and a known method can be used.
  • the structure is observed with a scanning electron microscope (SEM). You may judge by.
  • a calibration curve is created by paying attention to voids generated on the surface of the second product.
  • the method for obtaining the number density of voids within the evaluation range is not particularly limited, and a known method can be used. For example, after obtaining the number of voids within the evaluation range, the number of voids obtained is evaluated within the evaluation range. It can be obtained by dividing by the area. This may be obtained, for example, by performing tissue observation using a scanning electron microscope.
  • the damage rate of a product is a ratio representing how much time has passed under the same heating condition and the same pressurizing condition as determining the lifetime with respect to the lifetime of the product.
  • the product life is the time required for the product to break by constant heating and constant pressure.
  • the lifetime of a product can be determined by known methods, for example, by measuring a product of the same structure made from the same material as the product by constant heating and pressurization until it actually breaks.
  • the heating condition and the pressurizing condition for predicting the remaining lifetime may be any one of the conditions.
  • the maximum crack means a crack having the longest length among cracks generated in a product due to deterioration due to heating and pressurization within an evaluation range.
  • the crack is cut, if the length of the cut portion is equal to or less than a predetermined ratio with respect to the longer length of the two adjacent cracks, both the cracks and It is preferable to determine the length of the crack by regarding the broken portion as a single connected crack.
  • the present inventors in the case where the crack is broken in the middle, whether or not the broken portion will be a crack in the future is stronger from the longer of the two cracks adjacent to this broken portion Found to be affected.
  • the predetermined ratio is preferably half, more preferably 40%, and still more preferably 30%.
  • the length of the crack is the length of the straight line connecting the ends of the crack, and the length of the part that is cut is the two parts that the cut part and the two cracks adjacent to the cut part create.
  • a method of obtaining the length of the crack will be specifically described with reference to FIG.
  • cracks 10 (indicated by thick lines in FIG. 1) are generated along the plurality of crystal grains 1.
  • the length 3 of the cut portion is less than half of the longer length 4 of the two cracks adjacent to the cut portion.
  • the length of the crack 10 is determined to be the crack length 2.
  • the method for measuring the length of the crack is not particularly limited, and a known method can be used.
  • the crack length may be measured by observing the structure of the surface of the product with a scanning electron microscope.
  • a method for creating a calibration curve used in the method for predicting the remaining creep life of the first product deteriorated by heating and pressurization Including a step of setting an arbitrary evaluation range on the surface of the second product deteriorated by heating and pressurization, and a step of determining whether or not a crack is generated within the evaluation range.
  • the step of obtaining the number density of voids and the step of creating a calibration curve representing the relationship between the number density of the obtained voids and the damage rate of the second product are further included.
  • the step of obtaining the number of crystal grains over which the maximum crack generated within the evaluation range spans, and the relationship between the number of crystal grains obtained and the damage rate of the second product
  • a step of creating a calibration curve representing the first product and the second product may have a bainite structure. That is, in the above-described method, instead of obtaining the maximum crack length, the number of crystal grains spanning the maximum crack is obtained, and further, instead of creating a calibration curve representing the relationship between the maximum crack length and the damage rate of the second product. A calibration curve representing the relationship between the number of crystal grains over which the maximum crack extends and the damage rate of the second product is created.
  • the number of crystal grains over which a crack extends refers to the number of crystal grain boundary faces or sides where cracks run.
  • a predetermined ratio with respect to the longer length of the two adjacent cracks, both the cracks and It is preferable to determine the number of crystal grains over which the crack extends, assuming that the broken portion is one connected crack.
  • the predetermined ratio is preferably half, more preferably 40%, and still more preferably 30%.
  • cracks 10 are generated along the plurality of crystal grains 1. Although the crack 10 is cut off in the middle, the length 3 of the cut portion is less than half of the longer length 4 of the two cracks adjacent to the cut portion. Regarded as a single crack, including broken parts. As a result, the number of crystal grains over which the crack 10 extends is determined to be 6.
  • the method for measuring the number of crystal grains over which cracks cross is not particularly limited, and a known method can be used.
  • the number of crystal grains may be measured by observing the structure of the surface of the product with a scanning electron microscope. .
  • the calibration curve creation method according to the present invention in predicting the remaining life of a product having a bainite structure, even if the evaluation range is arbitrarily set by applying the number of crystal grains over which the maximum crack extends, it is set. This produces an advantageous effect that a calibration curve with very little error depending on the method can be created.
  • the first product when no crack is generated in the first product is obtained. It can be a calibration curve for predicting the remaining creep life of the product.
  • only one type of product may be used as the second product, or at least two types of products heated at different temperatures and pressurized at different pressures may be used.
  • the void number density, the maximum crack length, and / or the number of crystal grains spanning the maximum crack are appropriately determined, and all the obtained void number densities, the maximum crack length,
  • a calibration curve is created by determining the relationship with the damage rate of the second product using the number of grains over which the maximum crack spans.
  • the lifetimes of these products are comparable.
  • the same level means that the life of two or more types of products is preferably a difference of 25% or less, more preferably a difference of 20% or less, based on the life of the longest product. More preferably, the difference is within 10%.
  • a person skilled in the art can appropriately set the temperature and pressure applied to each product so that two or more types of products have the same life. For example, in Example 1 and Example 3 of the present application, two types of products, that is, a product heated at 550 ° C. and pressurized at 145 MPa and a product heated at 525 ° C. and pressurized at 240 MPa are used, which are common to these.
  • the approximate curve shown in FIG. 9 was obtained as a calibration curve representing the relationship between the void number density and the damage rate of the second product.
  • the approximate curve shown in FIG. 16 is obtained as a calibration curve representing the relationship between the maximum crack length and the damage rate of the second product
  • the approximate curve shown in FIG. 17 is obtained from the number of crystal grains spanning the maximum crack and the second product. It was obtained as a calibration curve representing the relationship with the damage rate.
  • the following is performed. First, an arbitrary evaluation range is set on the surface of the first product. Next, it is determined whether or not a crack has occurred within this evaluation range. If no crack has occurred, the remaining creep life is predicted based on the voids present on the surface of the first product. That is, first, the number density of voids within the evaluation range is obtained, and the obtained damage number density is obtained by substituting the obtained number density of voids into the void number density of the calibration curve prepared by the above-described method. Can do.
  • the remaining life of the first product can be predicted to be 1.5 times the time of heating and pressurization so far. Further, if a crack is generated within the evaluation range, the remaining creep life is predicted based on the maximum crack length generated on the surface of the first product. That is, first, the length of the maximum crack generated in the first product within the evaluation range is obtained. Then, by inserting the obtained maximum crack length into the maximum crack length of the calibration curve created by the above-described method, the damage rate of the corresponding product can be obtained. For example, if the corresponding damage rate is determined to be 0.80, the remaining life of the first product can be predicted to be 25% of the time of heating and pressurization so far.
  • the method for predicting the remaining creep life of a product deteriorated by heating and pressurization is as follows: When a crack is generated within the evaluation range, the length of the maximum crack generated within the evaluation range is determined. Instead of “obtaining the step of determining the damage rate of the product from the obtained maximum crack length” and “determining the number of crystal grains over which the maximum crack generated within the evaluation range spans” And a step of obtaining a damage rate of the product from the number of crystal grains ”.
  • the following is performed. First, the number of crystal grains over which the maximum crack generated in the first product extends is obtained. Next, the number of crystal grains obtained is inserted into the number of crystal grains across the maximum crack in the calibration curve created by the above-described method. Thereby, the damage rate of the corresponding product can be obtained.
  • Example 1 An internal pressure creep test was carried out using a cylindrical tube (STPA 22, outer diameter ⁇ 56.5 mm, inner diameter 47.5 mm, length 35.0 mm) made of chromium molybdenum steel and having a bainite structure as a sample.
  • One sample was subjected to an internal pressure of 145 MPa at a temperature of 550 ° C. (Test 1), and another sample was subjected to an internal pressure of 240 MPa at a temperature of 525 ° C. (Test 2).
  • the life of the sample in Test 1 and the life of the sample in Test 2 were about the same as the life of the sample in Test 2, which was about 23% shorter than that of the sample in Test 1.
  • the damage rates were 0, 0.12, 0.19, 0.26, 0.50, and 0.70, and for test 2, the damage rates were 0.00, 0,.
  • the structure of the sample was observed using a scanning electron microscope (SEM). Specifically, for each sample, an arbitrary evaluation range having a width of 1.0 mm 2 is determined, and the structure is observed at magnifications of 100 times, 500 times, and 1000 times, and the number of voids is determined. Examined. In order to show that a large error does not occur depending on how the evaluation range is selected, an evaluation range having a width of 0.3 mm 2 is further set from the evaluation range having a width of 1.0 mm 2 . The structure was also observed in this small evaluation range, and the number of voids was examined.
  • FIG. 9 shows the relationship between the average number of voids and the damage rate obtained from all SEM results. In all SEM results, no cracks occurred.
  • Example 2 the remaining creep life of a cylindrical tube having a bainite structure was predicted using FIG. 9 created in Example 1.
  • a pipe made of chromium molybdenum steel STPA 22, JIS standard G 3457 “arc welded carbon steel pipe for piping” was bent while being heated slowly so that it could be used in a boiler of a thermal power plant.
  • STPA 22 chromium molybdenum steel
  • JIS standard G 3457 arc welded carbon steel pipe for piping
  • the structure of the bent portion of the piping was observed using SEM.
  • SEM SEM image
  • the void number density was determined from the SEM image and found to be 50. From FIG. 9 created in Example 1, since the damage rate when the void number density is 50 is found to be 0.41, it is predicted that the damage rate of the bent portion of the boiler piping is 0.41. I was able to. In other words, it was possible to predict that the remaining life of the bent portion of this pipe was about 2.5 times the usage time up to now.
  • Example 3 An internal pressure creep test using a cylindrical tube (STPA 22, outer diameter ⁇ 56.5 mm, inner diameter 47.5 mm, length 35.0 mm) having a bainite structure made of chromium molybdenum steel material under the same conditions as in Example 1 Went.
  • One sample was subjected to an internal pressure of 145 MPa at a temperature of 550 ° C. (Test 1), and another sample was subjected to an internal pressure of 240 MPa at a temperature of 525 ° C. (Test 2).
  • the life of the sample in Test 1 and the life of the sample in Test 2 were about the same as the life of the sample in Test 2, which was about 23% shorter than that of the sample in Test 1.
  • test 1 when the damage rate is 0, 0.11, 0.18, 0.25, 0.47, 0.66, 0.76, 0.85 and 1.00, and for test 2 Observed the structure of the sample when the damage rate was 0.00, 0.14, 0.23, 0.32, 0.61, 0.85, 0.98, and 1.00.
  • the position of the evaluation range was set so as to include a central portion in the length direction of the pipe, which is likely to cause cracks in the cylindrical pipe.
  • the setting of the area of the evaluation range is determined as if the crack extends over 1.0 mm 2 or more areas comprises the entire crack, the size of 0.3 mm 2 or 1.0 mm 2 in other cases Set to have.
  • the structure is observed with a scanning electron microscope (SEM) at magnifications of 10 times, 50 times, 100 times, and 400 times, and the number of voids present in the evaluation range and cracks are present.
  • SEM scanning electron microscope
  • extended M parameter the maximum crack length and the number of crystal grains over which the maximum crack crosses
  • FIG. 10 (b) the maximum crack when the damage rate in Test 1 is 0.76 is cut off in the middle, but the length of the cut-off portion is the length of both adjacent cracks.
  • the maximum crack length was determined to be 518 ⁇ m, and the extended M parameter was determined to be 6.
  • the maximum crack when the damage rate in Test 1 is 0.85 is cut off at a plurality of locations, but the length of each cut-off location is Since each of the adjacent cracks was less than half of the length of the longer crack, the crack and the cut portion were regarded as one connected crack, and the maximum crack length was 1.09 mm.
  • the extended M parameter was determined to be 14.
  • Test 1 is summarized in Table 2
  • Test 2 is summarized in Table 3.
  • FIG. 16 shows a graph representing the relationship between the maximum crack length and the damage rate created based on Tables 2 and 3
  • FIG. 17 shows a graph representing the relationship between the extended M parameter and the damage rate.
  • Example 4 In Example 4, the remaining creep life of a cylindrical tube having a bainite structure was predicted using FIGS. 16 and 17 created in Example 3.
  • STPA 22 chromium molybdenum steel
  • JIS standard G 3457 arc welded carbon steel pipe for piping
  • the bent part of the pipe was observed with a SEM.
  • the maximum crack length was determined from the SEM image, and the result was 1.7 mm. From FIG. 16 created in Example 1, since the damage rate when the maximum crack length is 1.7 mm is found to be 0.95, the damage rate of the bent portion of the boiler piping is 0.95. I was able to predict. That is, the remaining life of the bent portion of the pipe could be predicted to be about 5% of the usage time up to now.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Medicinal Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

Le problème décrit par la présente invention est de pourvoir à un procédé permettant de prédire une durée de vie résiduelle au fluage de produits détériorés du fait de la chaleur et de la pression. Plus particulièrement, l'invention porte sur un procédé permettant de prédire une durée de vie résiduelle au fluage, ledit procédé étant caractérisé en ce qu'il comporte une étape consistant à établir une plage d'évaluation discrétionnaire sur la surface d'un produit, et une étape consistant à déterminer si des fissures se sont produites au cours de l'étape d'évaluation, et comprend en outre une étape au cours de laquelle, dans le cas où aucune fissure ne s'est produite dans la plage d'évaluation, une densité en nombre de vides dans la plage d'évaluation est calculée, et une étape au cours de laquelle un taux d'endommagement du produit est calculé à partir de la densité en nombre de vides, le procédé comprenant encore en outre une étape au cours de laquelle, dans le cas où des fissures se sont produites dans la plage d'évaluation, le nombre de grains cristallins qui ont été sectionnés par la plus grande fissure se produisant dans la plage d'évaluation est calculé, et une étape au cours de laquelle un taux d'endommagement du produit est calculé à partir du nombre de grains cristallins ainsi obtenu, le produit présentant une structure bainitique.
PCT/JP2013/078957 2013-10-25 2013-10-25 Procédé de prédiction de durée de vie résiduelle au fluage d'un produit détérioré par la chaleur et la pression, et procédé de création de courbe d'étalonnage utilisée dans ledit procédé de prédiction WO2015059815A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2013/078957 WO2015059815A1 (fr) 2013-10-25 2013-10-25 Procédé de prédiction de durée de vie résiduelle au fluage d'un produit détérioré par la chaleur et la pression, et procédé de création de courbe d'étalonnage utilisée dans ledit procédé de prédiction
JP2015512418A JP5859710B2 (ja) 2013-10-25 2013-10-25 加熱及び加圧により劣化した製品のクリープ余寿命の予測方法、及び、この予測方法に用いる検量線作成方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2013/078957 WO2015059815A1 (fr) 2013-10-25 2013-10-25 Procédé de prédiction de durée de vie résiduelle au fluage d'un produit détérioré par la chaleur et la pression, et procédé de création de courbe d'étalonnage utilisée dans ledit procédé de prédiction

Publications (1)

Publication Number Publication Date
WO2015059815A1 true WO2015059815A1 (fr) 2015-04-30

Family

ID=52992451

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2013/078957 WO2015059815A1 (fr) 2013-10-25 2013-10-25 Procédé de prédiction de durée de vie résiduelle au fluage d'un produit détérioré par la chaleur et la pression, et procédé de création de courbe d'étalonnage utilisée dans ledit procédé de prédiction

Country Status (2)

Country Link
JP (1) JP5859710B2 (fr)
WO (1) WO2015059815A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2021250968A1 (fr) * 2020-06-08 2021-12-16

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005139470A (ja) * 2002-11-06 2005-06-02 Tokyo Electric Power Co Inc:The 長寿命な耐熱低合金鋼溶接部材及びその製造方法
JP4054834B2 (ja) * 2004-06-21 2008-03-05 中国電力株式会社 クリープ余寿命の総合評価方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005139470A (ja) * 2002-11-06 2005-06-02 Tokyo Electric Power Co Inc:The 長寿命な耐熱低合金鋼溶接部材及びその製造方法
JP4054834B2 (ja) * 2004-06-21 2008-03-05 中国電力株式会社 クリープ余寿命の総合評価方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ISAMU NONAKA ET AL.: "202 Boiler Kiki ni Okeru Creep Hiro Sonsho no Keitai to Hyokaho", GAKUJUTSU KOENKAI KOEN RONBUNSHU, vol. 45, 1996, pages 37 - 38 *
THE JAPAN SOCIETY OF MECHANICAL ENGINEERS, DORYOKU PLANT KOZOBUTSU NO YOJUMYO HYOKA GIJUTSU, 10 April 1992 (1992-04-10), pages 62 - 69 , 196 TO 207 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2021250968A1 (fr) * 2020-06-08 2021-12-16
WO2021250968A1 (fr) * 2020-06-08 2021-12-16 株式会社Ihi Procédé d'évaluation de durée de vie sous fluage d'un composant en alliage de nickel
JP7279860B2 (ja) 2020-06-08 2023-05-23 株式会社Ihi Ｎｉ合金部品のクリープ寿命評価方法

Also Published As

Publication number Publication date
JPWO2015059815A1 (ja) 2017-03-09
JP5859710B2 (ja) 2016-02-10

Similar Documents

Publication Publication Date Title
JP5450903B1 (ja) 加熱及び加圧により劣化した製品のクリープ余寿命の予測方法、及び、この予測方法に用いる検量線作成方法
JP2010110820A (ja) 再熱割れ感受性の判定方法
JP5801520B1 (ja) 高クロム鋼管の余寿命を推定する余寿命推定方法
JP5086615B2 (ja) 高強度鋼溶接部のクリープ伸びによる寿命評価方法及び高強度鋼溶接部の寿命評価方法
JP4979563B2 (ja) クリープ寿命評価方法
Arora et al. Predictions for fatigue crack growth life of cracked pipes and pipe welds using RMS SIF approach and experimental validation
Guglielmino et al. Creep damage of high alloyed reformer tubes
JP4616778B2 (ja) 高強度鋼溶接部の寿命評価方法
Ogata et al. Damage characterization of a P91 steel weldment under uniaxial and multiaxial creep
JP5355832B1 (ja) ベイナイト組織を有する製品のクリープ余寿命の予測方法、及び、この予測方法に用いる検量線の作成方法
JP5859710B2 (ja) 加熱及び加圧により劣化した製品のクリープ余寿命の予測方法、及び、この予測方法に用いる検量線作成方法
JP2010203812A (ja) 高強度フェライト鋼の寿命評価方法
JP2014145657A (ja) 金属部材の寿命評価方法及び寿命評価装置
JP5475198B1 (ja) 加熱及び加圧により劣化した製品のクリープ余寿命の予測方法、及び、この予測方法に用いる検量線作成方法
Xing et al. Reliability analysis and life prediction of HK40 steel during high-temperature exposure
Bang et al. Quantitative study on area fraction of precipitated carbides of HP40Nb steel as a function of service period
Kamaya Monitoring of inside surface crack growth by strain measurements of the outside surface: Application of multiple strain measurements technique to fatigue crack growth
JP2013019758A (ja) 金属部材の損傷評価方法及び装置
CN113688546A (zh) 一种金属焊缝役致缺陷接收表的制定方法
JP5903120B2 (ja) クリープ損傷評価方法
Mokhtar et al. Failure analysis of high pressure high temperature super-heater outlet header tube in heat recovery steam generator
Bridges et al. Challenges in the Life Management of Steam Methane Reformer (SMR) Components
JP6720246B2 (ja) 金属壁部冷却方法
JP4865741B2 (ja) 鋼管の曲げ部の損傷評価方法
JP6090539B1 (ja) 鋳鋼材の余寿命評価方法

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2015512418

Country of ref document: JP

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13896005

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13896005

Country of ref document: EP

Kind code of ref document: A1