WO2004040022A1 - 耐環境助長割れ性の優れた金属構造製品および、金属構造製品の環境助長割れ抵抗性向上方法 - Google Patents
耐環境助長割れ性の優れた金属構造製品および、金属構造製品の環境助長割れ抵抗性向上方法 Download PDFInfo
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- WO2004040022A1 WO2004040022A1 PCT/JP2003/014031 JP0314031W WO2004040022A1 WO 2004040022 A1 WO2004040022 A1 WO 2004040022A1 JP 0314031 W JP0314031 W JP 0314031W WO 2004040022 A1 WO2004040022 A1 WO 2004040022A1
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- metal structure
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2201/00—Treatment for obtaining particular effects
- C21D2201/05—Grain orientation
Definitions
- the present invention relates to a metal structure or a structural product used as various devices such as a chemical plant and an oil refining device, a pipe, or a gas pipeline, and is used for a chloride, an amine, a hydrogen sulfide, a nitrate, and a carbonate.
- the present invention relates to a structure and a structural product having increased resistance to stress corrosion cracking and hydrogen embrittlement cracking (hereinafter referred to as environment-assisted cracking) in various corrosive environments such as, and a method of improving the environment-assisted cracking resistance.
- environment-assisted cracking stress corrosion cracking and hydrogen embrittlement cracking
- Corrosion cracking stress corrosion cracking of carbon steel in a CO—CO 2 -H 2 O environment in chemical plants, etc. Also, there is stress corrosion cracking of Ni alloy in pressure vessels and others. 11 ⁇ ⁇ 1! Alloy, even in humid air, seawater, freshwater environment, and A 1 In the alloy, stress corrosion cracking occurs in a chloride aqueous solution environment.
- stress relief annealing requires a large heat treatment furnace for heat treatment when the object to be treated is a large structural product, and it is impossible to perform heat treatment itself for a fixed structure or the like.
- this heat treatment has no effect on externally applied stress. It is also effective to reduce residual stress by shot peening, but as with heat treatment, there are problems with equipment for large metal structural products. Limited and cost-effective Because of the large size of the project, it was difficult to provide economic and efficient measures.
- a processing method using ultrasonic impact energy has been proposed to improve the strength of the welded portion of the welded product by the above-described peening treatment and to form a stress pattern that suppresses stress concentration and minute stress defects.
- the present invention has been made to solve the above-mentioned problem, and is a tool that vibrates the tip with ultrasonic waves at an amplitude of 20 to 60 ⁇ , a frequency of 19 kHz to 60 kHz, and an output of 0.2 to 3.
- an ultrasonic impact treatment that strikes the metal surface using a metal to the parts of the metal structure product where environmentally-friendly cracking is a problem
- the structure of the metal surface layer is improved, and therefore, excellent environmentally-friendly cracking resistance
- it is intended to obtain a metal structure product which has been processed, and to perform an appropriate pre-treatment and an inspection after the treatment in order to guarantee the effect.
- the metal of the metal structure product where environmentally-promoted cracking is problematic is steel having a tensile strength of 490 N / mm class 2 or higher. Metal structure products with excellent properties.
- the environmentally-assisted cracking resistance according to (1) or (2), wherein the portion where the environmentally-assisted cracking of the metal structural product is problematic includes a weld bond portion and / or a weld heat-affected zone.
- the ratio of the major axis length to the minor axis length of the crystal grains in which the major axis of the layered structure is substantially parallel to the surface is 5 or more (1) to (1).
- Ultrasonic bombardment treatment is applied to the parts of the metal structure product where environmentally-assisted cracking is a problem, and the surface metal structure with a thickness of 50 / xm or more is A method for improving environmentally-assisted cracking resistance of a metal structure product, wherein the method has a layered structure composed of parallel crystal grains.
- the metal of the metal structure product according to (6), wherein the metal at the place where the ring cracking of the metal structure product is problematic is steel having a tensile strength of 49 ON / mm class 2 or higher.
- Environmentally-friendly crack resistance improvement method is described below.
- the environment of the metal structure product according to (6) or (7), wherein the portion where the environmentally-assisted cracking of the metal structure product becomes a problem includes a weld bond portion and a Z or a weld heat affected zone. How to improve the resistance to accelerated cracking.
- the pretreatment is a process of changing internal stress and Z or surface stress at a location where environmentally-assisted cracking of the metal structure product becomes a problem and at a location in the vicinity thereof.
- the pre-treatment is characterized in that the pre-processing includes a process of detecting cracks at locations where environmentally-assisted cracking of the metal structure product is problematic, and removing the detected cracks. (11) or (11) 12. A method for improving environmentally-assisted cracking resistance of a metal structural product according to 2).
- the ultrasonic impact treatment further comprises: making the surface shape of the metal structure product at a location where environmentally-assisted cracking is problematic a shape in which stress concentration is unlikely to occur; and applying compressive residual stress in the vicinity of the surface.
- any of the above (6) to (14) is characterized by applying ultrasonic impact treatment to the parts where environmentally-assisted cracking of the metal structure product becomes a problem, and then conducting a quality assurance inspection. 4.
- the method for improving environmentally-assisted crack resistance of a metal structure product according to (1) (16) In the quality assurance inspection, the treated surface after ultrasonic impact treatment was plastically deformed by a thickness of 50 ⁇ m or more compared to the surface before the treatment, and stress concentration occurred on the treated surface.
- Fig. 1 (a) is a schematic cross-sectional view showing the progress of the stress corrosion cracking, showing the case where the grain boundaries are perpendicular to the direction of the tensile stress.
- Fig. 1 (b) is a schematic cross-sectional view showing the progress of stress corrosion cracking, showing the case where most of the grain boundaries are in a direction parallel to the direction of tensile stress.
- Figure 2 (a) is a micrograph showing the cross-sectional microstructure of a metal structure product before ultrasonic impact treatment.
- FIG. 2 (b) is a schematic diagram showing a cross-sectional structure of the metal structure product before the ultrasonic impact treatment.
- Figure 3 (a) is a micrograph showing the cross-sectional microstructure of a metal structure product after ultrasonic impact treatment.
- FIG. 3 (b) is a schematic diagram showing a cross-sectional structure of the metal structure product after the ultrasonic impact treatment.
- Fig. 4 is a diagram showing the sampling status of stress corrosion test specimens.
- the metal structural products to which the present invention is directed include structural parts such as mechanical parts, piping, containers, and the like made of metal, or equipment such as a combination thereof. These structural products are generally manufactured by subjecting a metal material to processing such as cutting and bending, or further, to welding.
- the metal material is not limited to steel materials such as carbon steel, low alloy steel, and stainless steel, but also includes metals such as Ni and Cu and alloys thereof.
- environmentally-assisted cracking is a phenomenon in which, when a metal structure product is in a corrosive environment in the presence of tensile stress, minute cracks generated on the surface or surface layer develop, and the function of the metal structure product decreases as a large crack.
- the direction of growth of this crack is perpendicular to the tensile stress (residual stress, external stress) and usually along the grain boundary. Therefore, as shown in Fig. 1 (b), if the direction of the tensile stress is substantially parallel to the direction of the grain boundary, this stress will cause the crack tip to open further. Since it does not act on cracks, it can slow down the growth, that is, improve the propagation resistance of cracks and suppress environmentally-assisted cracking.
- the present inventors have paid attention to this point and have conceived of using a layered structure as a surface structure at a location where environmentally-assisted cracking becomes a problem.
- a layered structure By forming a layered structure, most of the crystal grain boundaries are substantially parallel to the direction of the tensile stress. Therefore, as described above, even if a small crack occurs, the propagation resistance of the crack can be increased. In addition, it is possible to suppress environmentally-assisted cracking.
- the hammer at the tip is subjected to ultrasonic waves with an amplitude of 20 to 60 ⁇ , a frequency of 19 to 60 kHz, and an output of 0.2 to 3 Ultrasonic impact treatment in which a metal surface is struck and peened by a vibrating device (for example, U.S. Patent No. 6,171,41 ⁇ , Kourigo, iuriace Nanocrystall izat lon (SNC) of meta meta) ic Materials—Presentation of the Concept behind a New Approach, Journal. Sci. Technol. Vol.15 No.3, 1999).
- a vibrating device for example, U.S. Patent No. 6,171,41 ⁇ , Kourigo, iuriace Nanocrystall izat lon (SNC) of meta meta
- This treatment method is basically the same as hammer peening, except that the energy of each impact is small, but instead of applying more than 10,000 impacts per second, the metal is plastically deformed. It gives deformation. At this time, since the impact force of each impact is small, there is almost no recoil generated in the impact device, which is superior in terms of usability and workability as compared with the hammer peening device.
- the shape of the hammer at the tip can be reduced in size, and impact processing can be performed on minute or narrow parts such as welds and connections. it can. In this regard, processing can be applied to small areas where environmentally-friendly cracks are a problem. Even in this case, since the number of impacts can be extremely large as described above, sufficient plastic deformation can be given. In addition, since this ultrasonic impact treatment hits the metal surface a very large number of times, it has an effect that the conventional hammer peening does not have on the metal surface. One shot energy shot is larger than shot beaning, so it has an effect that conventional shot peening does not have.
- the number of hits increases the uniformity of the treatment. Even with hammer peening, a certain degree of uniformity can be obtained by performing several passes on the same line.However, the impact frequency of the ultrasonic impact treatment is 15 to 60 kHz, and the obtained uniformity is At a processing speed of about 0.5 mZ, almost all required metal surfaces can be finished uniformly and without leaving any defects.
- the inventor of the present invention has proposed an ultrasonic impact device having a tip hammer having a radius of curvature of 1.5 mm on the surface of a steel material, and has a processing speed of 0.5 ⁇ and a frequency of 2 ′ 5 kHz.
- One pass of ultrasonic impact treatment was performed at 5 mZ min, and the surface structure before and after the treatment was examined in detail.
- the results are shown in Fig. 2 (a), Fig. 2 (b), Fig. 3 (a), and Fig. 3 (b) as the cross-sectional state of the steel material before and after the treatment, with the respective micrographs and schematic diagrams.
- the cross section perpendicular to the treated surface was plastically deformed by the ultrasonic impact treatment, and the crystal grains whose major axis extended substantially parallel to the surface were arranged in multiple layers in the thickness direction. It has a layered structure.
- the major axis of the grains is substantially parallel to the surface, and the grain boundaries and tensile stress, which are the main directions of crack propagation extending from the steel surface exposed to the corrosive environment, It is thought that stress corrosion cracking can be reduced because the direction in which cracks act is close.
- the inventors carried out ultrasonic impact treatment on a 12 mm thick metal plate having the composition shown in Table 1 while changing the treatment conditions as shown in Table 2.
- a method of forming a welded part with a bead-on-plate as shown in Fig. 4 was used to collect three stress corrosion test specimens for each level, and to conduct an environmental promotion cracking test. Carried out.
- Table 3 shows the properties of the tissue and the results of the test. As can be seen from Table 3, when the thickness of the layered structure of the surface layer parallel to the surface is less than 50 ⁇ from the surface, the susceptibility to environmentally-assisted cracking is high, and cracking is likely to occur. On the other hand, when the thickness of the layered structure is 50 ⁇ m or more, no cracking occurs, and it is understood that excellent environmentally-assisted cracking resistance is exhibited.
- substantially parallel means that the direction of the long axis of the crystal grains of the layered structure and the surface are at an angle of ⁇ 10 ° or less.
- major axis and the minor axis refer to the major axis and minor axis of the crystal grains in a section in the thickness direction of the metal, that is, a section perpendicular to the metal-treated surface.
- the layered structure preferably has a ratio of the major axis length to the minor axis length (length in the major axis direction and the minor axis direction) of the crystal grains of the layered structure is 5 or more. This is because, as described above, the crystal grains extend in the major axis direction parallel to the surface, so that the grain boundaries parallel to the stress direction become longer and the crack propagation path becomes longer, leading to fracture. This is because it takes longer to complete.
- the ratio of the length in the major axis direction to the minor axis direction must be 5 or more.
- a layered structure can be formed uniformly and can be formed in multiple layers, which is extremely advantageous for environmentally-assisted cracking.
- the short axis length of crystal grains of the layered structure is 5 ⁇ m or less. If the length in the short axis direction is 5 ⁇ or more, the formation of a layered structure is insufficient, and the time until fracture is slightly shortened. On the other hand, if it is 5 ⁇ or less, the time until fracture can be more sufficiently secured.
- this ultrasonic impact treatment can make the metal surface layer have a layered structure by plastic deformation, make the surface shape smooth and planar, and apply compressive residual stress near the surface layer.
- the surface layer of the metal where the environment-assisted cracking becomes a problem by the ultrasonic impact treatment is formed into a layered structure, and the surface of this portion is made to have a surface shape in which stress concentration is unlikely to occur.
- the surface shape in which stress concentration is unlikely to occur is, for example, in the case of a weld toe, a shape in which the stress concentration coefficient is 2 or less. By adopting such a surface shape, stress concentration hardly occurs.
- compressive residual stress in the vicinity of the surface for example, within a range of 50 ⁇ m from the surface, it is possible to suppress the expansion of small defects serving as starting points of environmentally-assisted cracks into large cracks. Therefore, these micro-cracks can be rendered harmless, and the environmentally-assisted cracking resistance can be improved.
- the surface layer is formed into a layered structure, or the surface is formed into a shape in which stress concentration is unlikely to occur, and the surface is formed near the surface.
- various types of environmentally-promoted cracks such as stress corrosion cracking, hydrogen-induced cracking, and sulfide stress corrosion cracking, which are promoted by stress, can be suppressed and reduced.
- Metal structure products with excellent cracking properties be able to.
- This ultrasonic impact treatment may be applied to at least the parts of the above-mentioned metal structure product where environmentally-friendly cracking is a problem.
- the problematic part is that the metal structure product is in contact with the corrosive environment and stress is applied. Or a place that remains.
- the first place where the stress concentrates or remains is the weld joint (weld joint, heat affected zone).
- Weld joint welding joint, heat affected zone.
- Many metal structure products are manufactured with welding, and residual stress is generated in the welded joint.
- the weld toe of the weld joint tends to concentrate stress.
- the welded portion of the metal structural product that is, the portion including the welded bond portion and / or the weld heat affected zone is subjected to the ultrasonic impact treatment, and it is also preferable to include the welded toe portion.
- Examples of places where stress is concentrated or loaded besides welds are cuts due to sawing, cutting, fusing, etc., which may be added at the stage of manufacturing a metal structure product. At these points, large tensile and shear stresses are applied to the end faces as the cutting is performed. In addition, metal-structured products are sometimes constructed by bending or twisting, and the places where these are concentrated are subjected to tensile stress due to these bending and twisting. In addition to the stresses generated during these processing steps, there are some places where external stresses are applied during use, and these are also subject to this treatment. If the place where the tensile stress is applied is in a corrosive environment, as described above, the environment-assisted crack will be generated.
- the occurrence of environment-assisted cracking involves three conditions: environment, stress, and material.
- the ultrasonic impact treatment of the present invention is intended to reduce the stress conditions among them, and in particular, does not limit the material of the metal structure product. With a tensile strength of 49 ON / m and this applying also less for necessary portions of the structure product comprising m 2 or more steel is preferred.
- the tensile strength 4 9 ON / mm 2 or more steel, for residual stress of the welded portion is higher Ri good, further increases the environmental assisted cracking susceptibility.
- the effect of applying the ultrasonic impact treatment strength of the material becomes the larger Ri good both high tensile strength of 5 9 welds ON / mm 2 or more steel, tensile strength 6 9 0 N / mm 2 or more welds of the steel, the tensile weld strength 7 8 ON / mm 2 or more steel weld tensile strength 9 8 ONZmm 2 or more steel, a strong degree of accordance of increases, the ultrasonic impact treatment The effect and necessity to apply it will increase.
- the ultrasonic impact treatment is performed using an ultrasonic impact device having a tip hammer having a predetermined radius of curvature at the tip, with an amplitude of 20 to 60 ⁇ m and a cycle number of 19 to 60 k. Hz is applied to the required metal surface for the required time, but this impact plastically deforms the surface layer, transforming the crystal grains into a layered structure substantially parallel to the surface.
- the surface shape is such that stress concentration is unlikely to occur, and a residual compressive stress can be applied, so that resistance to environmentally-assisted cracking can be increased.
- the thickness of the plastic deformation of the metal surface layer by the ultrasonic impact treatment needs to be 50 ⁇ or more. If it is less than this, it is difficult to secure a layered structure of the surface layer of 50 ⁇ or more, and it is difficult to obtain a sufficient environment-assisted crack-promoting property. From the viewpoint of eliminating tensile stress and applying compressive stress, it is necessary to plastically deform a thickness of 50 / ⁇ ⁇ or more from the surface to form a layered structure. However, if the thickness of the layer structure or plastic deformation of this surface layer is excessively large, Excessively hardened or excessively deformed, resulting in poor surface properties of the product, but unfavorable due to increased processing costs.
- the thickness of the stratified structure or plastic deformation caused by the impact energy is also related to the radius of curvature R of the hammer at the tip of the impact device.
- the thickness of the lamellar structure or plastic deformation generated by the impact increases, and the larger the R, the smaller the thickness.
- the shape of the hammer at the tip of the ultrasonic impact treatment device is appropriately selected depending on the condition of the metal structure product to be treated.
- the required thickness of the metal structure product from the surface to be treated is formed into a layered structure, or the shape is such that stress is less likely to concentrate, and the hammer required to apply compressive residual stress is applied.
- processing conditions such as shape, impact energy of one cycle, number of passes, number of treatments, etc., for example, by a preliminary test etc., for each metal material or, if necessary, for each treatment location such as welded part, cut end face, etc. After the treatment, the required layer structure or compressive residual stress can be given. Wear.
- the stress state such as the internal stress and / or the surface stress at the location where the metal structure product is subjected to the ultrasonic impact treatment is changed.
- the treatment is not performed after the ultrasonic impact treatment.
- At least a portion of the metal structure product to be subjected to the treatment includes, for example, plastic working, straightening, heat treatment, welding, etc. It is preferable that a treatment that changes the situation, the stress state, and the like be performed as a pre-treatment before performing the ultrasonic shock treatment, and that such treatment is not performed after the ultrasonic shock treatment. Is preferred.
- the above pretreatment preferably includes, in addition to the above-described respective treatments, a process of inspecting the presence of a crack at a location where cracking is a problem, and removing the detected crack.
- a process of inspecting the presence of a crack at a location where cracking is a problem and removing the detected crack.
- the detected cracks are subjected to a process to remove them in advance. How to remove is to grind the crack An appropriate method such as grinding and cutting with a cutting tool, etc., or fusion bonding of cracks by welding is adopted.
- the cracked portion is ground and removed, and after welding, the surface of this portion is ground by a mechanical means such as a grinder or cutting tool. It is preferable to include a process for finishing to a smoother shape and further confirming that no crack is detected by the crack inspection process described above.
- the above-mentioned pre-processing is performed as necessary, and then the above-described ultrasonic impact processing is performed. Thereafter, the quality assurance inspection is performed as necessary.
- Plastically deformed to a thickness of 50 ⁇ m or more that is, a surface layer with a thickness of 50 ⁇ or more from the surface has a layered structure, and the surface shape of the treated surface is unlikely to cause stress concentration It is to confirm whether one or both of the two are satisfied.
- the grain size of the treated surface is measured by an ultrasonic grain size measuring device, and it is determined whether 50% or more of the grain size is smaller than that of the untreated part. This can be done by: If the crystal grain refinement is less than 50%, the formation of a layered structure is insufficient.
- miniaturization means that if the grain size number is 1 or more larger than the crystal grain size of the part to be treated, it is determined to be fine.
- a molding material such as a dental shape material, for example, and inspect the surface shape of the replicated mold.
- a high-precision displacement measuring device such as a displacement meter
- it can be performed by determining whether or not the treated surface has a curvature or a displacement of the surface on which stress concentration is difficult.
- a quality assurance inspection to confirm the surface structure or surface shape after ultrasonic impact treatment by the above-mentioned method, it is possible to reduce the environmentally-assisted cracking resistance of metal-structured products where environmentally-assisted cracking is a problem. You can confirm the gender improvement.
- a steel (sheet thickness of 12 mm) having the composition shown in Table 1 was used as the base metal 1, and a welded part 2 obtained by arc welding using a common metal welding material was used as a test specimen.
- the metal structure of the surface layer was given as a layered structure composed of crystal grains whose major axis was substantially parallel to the surface.
- As-welded specimens were used as comparative materials. As shown schematically in Fig. 4, the width is 100 mm, the length is 200 mm, and the thickness of the plate is the original thickness. The test piece was used. Needless to say, there is residual welding stress in the weld of the as-welded specimen.
- the metal structure product excellent in environmentally-assisted cracking resistance of the present invention is subjected to ultrasonic impact treatment at a location where environmentally-assisted cracking is a problem, and the surface layer has a layered structure. Since the surface has a surface shape where stress concentration is unlikely to occur and a residual compressive stress is applied, micro-cracks are unlikely to occur even when exposed to a corrosive environment. Suppresses progress, greatly increases rupture time, and has excellent resistance to environmentally-assisted cracking. Further, according to the method of the present invention, by combining the quality assurance inspection after the ultrasonic impact treatment, the surface layer of the treated portion has a predetermined layered structure and further has a surface shape. ⁇ It is possible to reliably improve the environmentally friendly cracking resistance of required parts of metal structure products.
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU2003280700A AU2003280700A1 (en) | 2002-10-31 | 2003-10-31 | Metal structure product with excellent environmental cracking resistance and method of enhancing environmental cracking resistance of metal structure product |
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JP2002318155A JP4441166B2 (ja) | 2002-10-31 | 2002-10-31 | 鋼構造製品の環境助長割れ抵抗性向上方法 |
JP2002-318155 | 2002-10-31 |
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WO2004040022A1 true WO2004040022A1 (ja) | 2004-05-13 |
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PCT/JP2003/014031 WO2004040022A1 (ja) | 2002-10-31 | 2003-10-31 | 耐環境助長割れ性の優れた金属構造製品および、金属構造製品の環境助長割れ抵抗性向上方法 |
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JP (1) | JP4441166B2 (ja) |
KR (1) | KR100664003B1 (ja) |
CN (1) | CN100439519C (ja) |
AU (1) | AU2003280700A1 (ja) |
WO (1) | WO2004040022A1 (ja) |
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JP4850505B2 (ja) * | 2005-12-19 | 2012-01-11 | 古河機械金属株式会社 | 超塑性マグネシウム合金材の製造方法 |
JP4837428B2 (ja) * | 2006-04-17 | 2011-12-14 | 新日本製鐵株式会社 | 溶接止端部の超音波衝撃処理方法 |
JP4987772B2 (ja) * | 2007-03-30 | 2012-07-25 | 新日本製鐵株式会社 | ロングレール |
JP4987773B2 (ja) * | 2007-03-30 | 2012-07-25 | 新日本製鐵株式会社 | ロングレール |
JP2009291918A (ja) * | 2008-06-09 | 2009-12-17 | Jfe Steel Corp | 繰り返し荷重履歴を受けた金属材料の疲労寿命を延命化させる方法 |
KR101277838B1 (ko) * | 2009-12-28 | 2013-06-21 | 주식회사 포스코 | 선재의 표면크랙깊이 측정방법 |
US20140290808A1 (en) * | 2011-07-11 | 2014-10-02 | Uit, Llc | Remediation of Sensitization in Metals |
JP5944989B2 (ja) * | 2012-05-31 | 2016-07-05 | Udトラックス株式会社 | 排気管の耐久性向上方法 |
JP6699221B2 (ja) * | 2016-02-23 | 2020-05-27 | 日本製鉄株式会社 | 試験片の製造方法、試験片および応力腐食割れ試験方法 |
US10330645B2 (en) * | 2016-09-13 | 2019-06-25 | Livermore Software Tecchnology Corp. | Systems and methods for determining crack propagation length inside a structure using a technique based on acoustic signature |
CN108707741B (zh) * | 2018-06-06 | 2019-08-09 | 江苏省特种设备安全监督检验研究院 | 一种奥氏体不锈钢焊接接头的表面复合处理工艺 |
CN109097708B (zh) * | 2018-09-06 | 2021-02-09 | 中国石油大学(华东) | 一种提高单相高熵合金表面性能的方法 |
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- 2002-10-31 JP JP2002318155A patent/JP4441166B2/ja not_active Expired - Fee Related
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- 2003-10-31 CN CNB2003801021931A patent/CN100439519C/zh not_active Expired - Lifetime
- 2003-10-31 AU AU2003280700A patent/AU2003280700A1/en not_active Abandoned
- 2003-10-31 KR KR1020057007739A patent/KR100664003B1/ko active IP Right Grant
- 2003-10-31 WO PCT/JP2003/014031 patent/WO2004040022A1/ja active Application Filing
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JPS6479320A (en) * | 1987-09-19 | 1989-03-24 | Nippon Steel Corp | Improvement of material quality of metal for welding austenitic stainless steel |
JPH081514A (ja) * | 1994-06-16 | 1996-01-09 | Toshiba Corp | 原子炉内構造物の表面処理方法 |
JPH09234585A (ja) * | 1996-02-29 | 1997-09-09 | Mitsubishi Heavy Ind Ltd | 溶接残留応力の低減装置付き溶接装置 |
US6171415B1 (en) * | 1998-09-03 | 2001-01-09 | Uit, Llc | Ultrasonic impact methods for treatment of welded structures |
JP2003113418A (ja) * | 2001-10-04 | 2003-04-18 | Nippon Steel Corp | 疲労寿命向上処理法およびそれによる長寿命金属材 |
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KR20050065664A (ko) | 2005-06-29 |
CN100439519C (zh) | 2008-12-03 |
CN1708592A (zh) | 2005-12-14 |
JP4441166B2 (ja) | 2010-03-31 |
KR100664003B1 (ko) | 2007-01-03 |
JP2004149880A (ja) | 2004-05-27 |
AU2003280700A1 (en) | 2004-05-25 |
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