WO2004046560A1 - Method of repairing turbine blade - Google Patents

Method of repairing turbine blade Download PDF

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Publication number
WO2004046560A1
WO2004046560A1 PCT/JP2003/014333 JP0314333W WO2004046560A1 WO 2004046560 A1 WO2004046560 A1 WO 2004046560A1 JP 0314333 W JP0314333 W JP 0314333W WO 2004046560 A1 WO2004046560 A1 WO 2004046560A1
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WIPO (PCT)
Prior art keywords
turbine blade
corrosion pit
repairing
pit
corrosion
Prior art date
Application number
PCT/JP2003/014333
Other languages
French (fr)
Japanese (ja)
Inventor
Tadashi Ishikawa
Kiyotaka Nakashima
Tetsuro Nose
Original Assignee
Nippon Steel Corporation
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Publication date
Application filed by Nippon Steel Corporation filed Critical Nippon Steel Corporation
Priority to AU2003277680A priority Critical patent/AU2003277680A1/en
Publication of WO2004046560A1 publication Critical patent/WO2004046560A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P6/00—Restoring or reconditioning objects
    • B23P6/002—Repairing turbine components, e.g. moving or stationary blades, rotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • F01D5/286—Particular treatment of blades, e.g. to increase durability or resistance against corrosion or erosion

Definitions

  • the present invention relates to a method for repairing a turbine blade attached to a rotating body in a corrosive environment. More specifically, it relates to a method for repairing a turbine blade mounted on a jet engine or the like of a gas blower containing NOx and SOx.
  • Blowers for corrosive gases containing NOx, SOx, etc. have cracks on the surface of the blades. Accidents can occur where the bin blade is instantaneously damaged in the round head condition. For example, when inspecting a turbine blade, a corrosion pit with a diameter of about 10 ⁇ m may be found.In this case, it is necessary to determine whether to replace the turbine blade with a new one or to determine how many months it will last. Be forced.
  • the method to prevent the turbine blade from breaking as described above is to measure the length of the crack on the surface of the turbine blade during inspection of the rotating machine. However, if this exceeded, for example, 50 ⁇ m, measures such as replacing the turbine blade were taken. However, since turbine blades are expensive parts made of special alloys and are expensive to replace, the turbine blade replacement time can be delayed as much as possible. Technology is needed to extend blade life Had been.
  • the prior art relating to the method of applying ultrasonic vibration includes, for example, U.S. Pat. No. 6,171,415, which describes a method for applying a welding seam portion heated by a welding arc immediately after arc welding.
  • a method for applying ultrasonic vibration along the axis is disclosed.
  • this prior art is a method for improving the fatigue strength of a welded portion by striking with an ultrasonic vibrator, and there is no disclosure of the extension of the life by repairing a turbine blade, which is the object of the present invention. Absent. Disclosure of the invention
  • the present invention solves the above-mentioned problems of the prior art and extends the life of a turbine blade by providing a method of repairing a turbine blade attached to a rotating body in a corrosive environment.
  • the purpose of this study was to solve this problem, and the purpose of this study was to make a study to solve the problem by applying an ultrasonic vibration terminal to the surface of the corrosion pit generated on the turbine blade. It provides a method of repairing a turbine blade attached to a rotating body in a corrosive environment, and significantly extends the life of the turbine blade.
  • this is a method of repairing a turbine blade installed in a blower for a blast furnace, and the average diameter of corrosion pits generated on the surface of this turbine blade: Before D grows to 50 ⁇ m or more, 'The surface of the corrosion pit is subjected to an ultrasonic impact treatment by striking with an ultrasonic vibration terminal so that the depth of the corrosion pit: d is 5 ⁇ or less. It is a repair method.
  • FIG. 1 is a diagram showing a turbine blade to which the present invention is applied.
  • Figure 2 is a diagram showing the process from the generation of corrosion pits to the breakage.
  • FIG. 3 is a diagram showing an embodiment of the turbine blade repair method of the present invention.
  • FIG. 4 is a diagram showing the effect of the turbine blade repair method of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a diagram showing a turbine blade to which the present invention is applied.
  • the upper side shows a perspective view, and the lower side shows a plan view.
  • the tip of the turbine blade 1 attached to a rotating machine such as a blower for corrosive gas containing NOx and SOx is the part that is most likely to be corroded by the collision of corrosive gas. It is.
  • the present inventors have found that a corrosion pit 2 having a size of about 1 ⁇ m to 50 / zm is formed at the tip of the turbine blade 1, and the size of the corrosion pit 2 is about 50 ⁇ . When it exceeded that, a fatigue crack was generated from it, and it was found that it propagated rapidly, leading to fracture.
  • Figure 2 is a diagram showing the process from generation of corrosion pits to fracture.
  • the left side of (a) to (d) is a plan view of the corrosion pit, and the right side is a cross-sectional view.
  • a circular corrosion pit 2 having a diameter of about 1 ⁇ is formed at the tip of the turbine blade.
  • the microscopic metallographic structure matrix, second phase particles such as precipitates, etc.
  • the corrosion pit 2 gradually expands, the microscopic metallographic structure (matrix, second phase particles such as precipitates, etc.) causes the localization.
  • the battery is formed and corrosion progresses selectively, Of the inner surface becomes uneven.
  • it grows as corrosion pit 2 until the diameter D becomes about 10 ⁇ m.
  • (d) when the corrosion pit has grown to a size of about 50 ⁇ m, a semielliptical fatigue crack 3 is formed around the corrosion pit 2, Crack 3 grows rapidly, leading to fracture.
  • FIG. 3 is a diagram showing an embodiment of the turbine blade repair method of the present invention.
  • the surface of the corrosion pit 2 is subjected to ultrasonic impact treatment by striking it with an ultrasonic vibrating terminal (hammer) 4. While reducing the depth d of pit 2 to less than 5 ⁇ , the portion near the edge of the pit is moved into the hole of the pit by plastic flow to smooth the inner surface and the edge of the pit. Stress concentration can be eliminated. As a result, the corrosion pit does not act as a point at which a fatigue crack is generated, so that the generation and propagation of the fatigue crack can be suppressed.
  • the average diameter of the corrosion pit 2 is 50 ⁇ m. It is more preferable to perform the step before the growth above, and before the growth above 20 ⁇ .
  • the diameter of the tip of the hammer 4 used for the ultrasonic impact treatment is preferably 0.5 mm to 2.0 mm. The reason is that if the diameter of the hammer exceeds 2 mm, the impact processing applied at one time is too wide compared to the size of the corrosion pit, and the effect of the impact processing does not reach the inner surface of the pit.
  • the present invention relates to SUS316L stainless steel, S US304 stainless steel, maraging steel, Ti alloy, and 2000 aluminum Particularly suitable is a turbine blade made of a metal material such as a nickel alloy or a 7000 series aluminum alloy.
  • the ultrasonic generator used in the present invention is not limited, the ultrasonic vibration of 19 kHz to 60 kHz is generated by a transducer using a power supply of 200 w to 3 kw, and the ultrasonic vibration is amplified by a wave guide.
  • a device that vibrates an ultrasonic vibration terminal composed of a pin having a diameter of 0.5 to 2.0 mm with an amplitude of 20 to 60 m is preferable.
  • FIG. 4 is a diagram showing the effect of the turbine blade repair method according to the present invention, in which the horizontal axis represents the fracture life when the time until the complete breakage of the turbine blade is set to 1, and the vertical axis represents the depth.
  • the size of the corrosion pit (average diameter D) with a logarithm exceeding 5 ⁇ m is shown in logarithmic form.
  • the size of the corrosion pit gradually increases with the operating time of the rotating machine, and if left untouched, fatigue cracks occur and sharply increase as indicated by the dotted line. Evolves and leads to total fracture. Therefore, according to the present invention, before the size of the corrosion pit (average diameter D) grows to 50 ⁇ or more (preferably 20 ⁇ m or more), the surface of the corrosion pit is hit with an ultrasonic vibration terminal. As shown by the arrow in Fig. 4, the size of the corrosion pit with a depth of 5 ⁇ m or more is reduced to several ⁇ m to prevent the occurrence of fatigue cracks. However, the turbine blade does not result in total breakage. Furthermore, by repeating this repair work, the life of the turbine blade can be significantly extended, and theoretically it can be used semi-permanently.
  • Example 1 the life of the turbine blade can be significantly extended, and theoretically it can be used semi-permanently.
  • the method for repairing a turbine blade of the present invention was applied to a turbine blade of a blower for supplying hot air to a blast furnace of a steelworks under the following conditions.
  • Turbine blade material SUS 316L stainless steel
  • Blast gas Hot air containing NOx and SOx
  • the surface of the corrosion pit generated on the turbine blade is subjected to a striking treatment by an ultrasonic vibration terminal, thereby repairing the turbine blade attached to the rotating body in a corrosive environment.
  • a method is provided that can significantly extend the life of turbine blades.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Blast Furnaces (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

A method of repairing a turbine blade fitted to a rotor (desirably a blower for blast furnace) in a corrosive environment capable of extending the service life of the turbine blade, characterized by comprising the steps of applying a hammering treatment by ultrasonic vibration terminal to a surface with corrosive pits before the corrosive pits produced on the surface of the turbine blade are grown to an averaged diameter of 50 μm or larger to reduce the depth of the corrosive pits to 5 μm or shallower.

Description

明 細 書 タービンブレー ドの補修方法 技術分野  Description Turbine blade repair method Technical field
本発明は、 腐食環境にある回転体に取り付けられたタービンブレ ー ドの補修方法に関する。 具体的には、 NOxや SOxなどを含むガスの 送風機ゃジエツ トエンジンなどに取り付けられるタービンブレー ド の補修方法に関する。 背景技術  The present invention relates to a method for repairing a turbine blade attached to a rotating body in a corrosive environment. More specifically, it relates to a method for repairing a turbine blade mounted on a jet engine or the like of a gas blower containing NOx and SOx. Background art
NOxや SOxなどを含む腐食性ガスの送風機ゃジエツ トェンジンなど の回転機に取り付けられるタービンブレー ドにおいては、 ブレー ド の表面にき裂が入り、 該き裂が進展し、 破断することにより、 ター ビンブレー ドが一瞬にして丸坊主状態に損傷する事故が発生するこ とがある。 例えば、 タービンブレー ドの点検時に直径 10 μ m程度の 腐食ピッ トが見つかることがあり、 その際、 新たなタービンブレー ドと交換すべきか、 あるいは、 あと何ヶ月寿命があるかを判定する 必要に迫られる。  Blowers for corrosive gases containing NOx, SOx, etc. ゃ Turbine blades attached to rotating machines such as the jet engine have cracks on the surface of the blades. Accidents can occur where the bin blade is instantaneously damaged in the round head condition. For example, when inspecting a turbine blade, a corrosion pit with a diameter of about 10 μm may be found.In this case, it is necessary to determine whether to replace the turbine blade with a new one or to determine how many months it will last. Be forced.
この腐食ピッ トはいつ疲労き裂に進展するかわからないので、 前 述のよ うなタービンブレー ドの破断を防止する方法と しては、 回転 機の点検時にタービンブレードの表面のき裂長さを測定し、 これが 例えば 50 μ mを超えた場合には、 タービンブレー ドを交換するなど の処置が行われていた。 しかし、 タービンブレー ドは特殊な合金に よつて製作される高価な部品であり、 その交換には多大なコス トが かかるため、 タービンブレー ドの交換時機をできる限り遅らせるこ とができるようにタービンブレー ドの寿命を延長する技術が求めら れていた。 Since it is not known when this corrosion pit will develop into a fatigue crack, the method to prevent the turbine blade from breaking as described above is to measure the length of the crack on the surface of the turbine blade during inspection of the rotating machine. However, if this exceeded, for example, 50 μm, measures such as replacing the turbine blade were taken. However, since turbine blades are expensive parts made of special alloys and are expensive to replace, the turbine blade replacement time can be delayed as much as possible. Technology is needed to extend blade life Had been.
また、 超音波振動を与える方法に関する従来技術と しては、 例え ば、 米国特許第 6，171，415号明細書に、 アーク溶接直後に溶接ァー クによつて熱せられた溶接シーム部に沿って超音波振動を付与する 方法が開示されている。 しかし、 この従来技術は、 超音波振動子で 打撃することにより溶接部の疲労強度を向上させる方法であって、 本発明が目的とするタービンブレー ドの補修による寿命延長につい ては全く開示されていない。 発明の開示  The prior art relating to the method of applying ultrasonic vibration includes, for example, U.S. Pat. No. 6,171,415, which describes a method for applying a welding seam portion heated by a welding arc immediately after arc welding. A method for applying ultrasonic vibration along the axis is disclosed. However, this prior art is a method for improving the fatigue strength of a welded portion by striking with an ultrasonic vibrator, and there is no disclosure of the extension of the life by repairing a turbine blade, which is the object of the present invention. Absent. Disclosure of the invention
本発明は、 前述のような従来技術の問題点を解決し、 腐食環境に ある回転体に取り付けられたタ一ビンブレー ドの補修方法を提供す ることによ り、 タービンブレー ドの寿命を延長することを課題と し 、 これを解決するために銳意検討の結果なされたものであり、 ター ビンブレー ドに発生する腐食ピッ トの表面に、 超音波振動端子によ る打撃処理を行うことによ り、 腐食環境にある回転体に取り付けら れたタ一ビンブレー ドの補修方法を提供し、 タ一ビンブレー ドの寿 命を著しく延長するものであり、 その要旨は、 腐食環境にある回転 体、 例えば高炉用の送風機などに取り付けられたタービンプレー ド の補修方法であって、 このタービンブレー ドの表面に発生する腐食 ピッ トの平均径 ： Dが 50 μ m以上に成長する前に、 '腐食ピッ トの表 面に、 超音波振動端子で打撃する超音波衝撃処理を行う ことによ り 腐食ピッ トの深さ ： dを 5 μ πι以下とすることを特徴とするタービ ンブレー ドの補修方法である。 図面の簡単な説明  The present invention solves the above-mentioned problems of the prior art and extends the life of a turbine blade by providing a method of repairing a turbine blade attached to a rotating body in a corrosive environment. The purpose of this study was to solve this problem, and the purpose of this study was to make a study to solve the problem by applying an ultrasonic vibration terminal to the surface of the corrosion pit generated on the turbine blade. It provides a method of repairing a turbine blade attached to a rotating body in a corrosive environment, and significantly extends the life of the turbine blade. For example, this is a method of repairing a turbine blade installed in a blower for a blast furnace, and the average diameter of corrosion pits generated on the surface of this turbine blade: Before D grows to 50 μm or more, 'The surface of the corrosion pit is subjected to an ultrasonic impact treatment by striking with an ultrasonic vibration terminal so that the depth of the corrosion pit: d is 5 μπι or less. It is a repair method. BRIEF DESCRIPTION OF THE FIGURES
図 1 は、 本発明が対象とするタービンブレー ドを示す図である。 図 2は、 腐食ピッ トの生成から破断に至るプ口セスを示す図であ る。 FIG. 1 is a diagram showing a turbine blade to which the present invention is applied. Figure 2 is a diagram showing the process from the generation of corrosion pits to the breakage.
図 3は、 本発明のタービンブレー ドの補修方法の実施形態を示す 図である。  FIG. 3 is a diagram showing an embodiment of the turbine blade repair method of the present invention.
図 4は、 本発明におけるタービンブレー ドの補修方法の効果を示 す図である。 発明を実施するための最良の形態  FIG. 4 is a diagram showing the effect of the turbine blade repair method of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
本発明の実施の形態について、 図 1〜図 4を用いて詳細に説明す る。  An embodiment of the present invention will be described in detail with reference to FIGS.
図 1 は、 本発明が対象とするタービンブレー ドを示す図であり、 上側はその斜視図、 下側は平面図を示している。 図 1において、 NO Xや SOxなどを含む腐食性ガスの送風機等の回転機に取り付けられる タ一ビンブレー ド 1 の先端部は、 腐食性ガスが衝突するこ とによつ て最も腐食されやすい部位である。  FIG. 1 is a diagram showing a turbine blade to which the present invention is applied. The upper side shows a perspective view, and the lower side shows a plan view. In Fig. 1, the tip of the turbine blade 1 attached to a rotating machine such as a blower for corrosive gas containing NOx and SOx is the part that is most likely to be corroded by the collision of corrosive gas. It is.
本発明者らは、 このタービンブレー ド 1 の先端部に 1 ； u m〜50 /z m程度の大きさの腐食ピッ ト 2が生成し、 この腐食ピッ ト 2の大き さが 50 μ ΐη程度の大きさを超えると、 そこから疲労き裂が発生し、 急速に伝播成長するため、 破断に至ることを突き止めた。  The present inventors have found that a corrosion pit 2 having a size of about 1 μm to 50 / zm is formed at the tip of the turbine blade 1, and the size of the corrosion pit 2 is about 50 μΐη. When it exceeded that, a fatigue crack was generated from it, and it was found that it propagated rapidly, leading to fracture.
図 2は、 腐食ピッ トの生成から破断に至るプロセスを示す図であ る。 図 2において （ a ) 〜 （ d ) の左側が腐食ピッ トの平面図、 右 側が断面図を示す。  Figure 2 is a diagram showing the process from generation of corrosion pits to fracture. In Fig. 2, the left side of (a) to (d) is a plan view of the corrosion pit, and the right side is a cross-sectional view.
まず、 図 2において、 （ a ) に示すように、 前述のタービンブレ 一ドの先端部に直径 1 μ πι程度の円形の腐食ピッ ト 2が生成する。 次に、 （ b ) に示すように、 この腐食ピッ ト 2が徐々に拡大する過 程で微視的な金属組織 （マ ト リ ックス、 析出物等の第二相粒子等） によ り局所電池が形成され選択的に腐食が進行していく のでピッ ト の内表面の形状が凹凸状になる。 さ らに、 （ C ) に示すように、 直 径 Dが 10 μ m程度になるまでは腐食ピッ ト 2 として成長する。 次に 、 ( d ) に示すように、 腐食ピッ トの直径が 50 μ m程度の大きさに 成長した時点で腐食ピッ ト 2の周辺に半楕円状の疲労き裂 3が発生 し、 この疲労き裂 3が急速に成長し、 破断に至る。 First, as shown in (a) in FIG. 2, a circular corrosion pit 2 having a diameter of about 1 μπι is formed at the tip of the turbine blade. Next, as shown in (b), as this corrosion pit 2 gradually expands, the microscopic metallographic structure (matrix, second phase particles such as precipitates, etc.) causes the localization. As the battery is formed and corrosion progresses selectively, Of the inner surface becomes uneven. Furthermore, as shown in (C), it grows as corrosion pit 2 until the diameter D becomes about 10 μm. Next, as shown in (d), when the corrosion pit has grown to a size of about 50 μm, a semielliptical fatigue crack 3 is formed around the corrosion pit 2, Crack 3 grows rapidly, leading to fracture.
図 3は、 本発明のタービンブレー ドの補修方法の実施形態を示す 図である。 図 3において、 腐食ピッ ト 2の平均直径が 50 μ m程度に 成長する前に、 腐食ピッ ト 2の表面を超音波振動端子 （ハンマ） 4 で打撃する超音波衝撃処理を施すことによって、 腐食ピッ ト 2の深 さ dを 5 μ πι以下に浅くすると ともに、 ピッ トの縁近くの部分をピ ッ トの穴の中に塑性流動によ り移動させ、 ピッ トの内面および縁を 滑らかにして応力集中をなくすことができる。 これにより、 この腐 食ピッ トが疲労き裂の発生点と して作用しなくなるため、 前述の疲 労き裂の発生と進展を抑制することができる。  FIG. 3 is a diagram showing an embodiment of the turbine blade repair method of the present invention. In Fig. 3, before the corrosion pit 2 grows to an average diameter of about 50 μm, the surface of the corrosion pit 2 is subjected to ultrasonic impact treatment by striking it with an ultrasonic vibrating terminal (hammer) 4. While reducing the depth d of pit 2 to less than 5 μπι, the portion near the edge of the pit is moved into the hole of the pit by plastic flow to smooth the inner surface and the edge of the pit. Stress concentration can be eliminated. As a result, the corrosion pit does not act as a point at which a fatigue crack is generated, so that the generation and propagation of the fatigue crack can be suppressed.
なお、 本発明の超音波衝撃処理を行うタイ ミ ングは、 腐食ピッ ト 2の平均直径が小さい方が疲労き裂に進展する危険性が少ないので 、 腐食ピッ ト 2の平均直径が 50 μ m以上に成長する前と し、 20 μ πι 以上に成長する前に行う ことがさらに好ましい。  In the timing of performing the ultrasonic impact treatment of the present invention, since the smaller the average diameter of the corrosion pit 2 is, the smaller the risk of developing a fatigue crack is, the average diameter of the corrosion pit 2 is 50 μm. It is more preferable to perform the step before the growth above, and before the growth above 20 μπι.
この超音波衝撃処理に用いるハンマ 4の先端部の直径は 0. 5mm〜2 . 0mmが好ましい。 その理由は、 ハンマ径が 2 mm超では一度に与える 衝撃加工が腐食ピッ トのサイズに比べて広範囲になり過ぎて、 ピッ トの内面まで衝撃加工の効果が行き届かないからであり、 またハン マ径が 0. 5mm未満では、 ピッ ト内面への加工が十分行き届く ものの 、 ハンマ先端によって形成される圧痕の直径が小さ過ぎて、 そこが 応力集中部となって、 疲労き裂の発生の起点となるからである。 本発明は、 ピッ ト腐食が生じやすい、 SUS316L系ステンレス鋼、 S US304系ステンレス鋼、 マルエージング鋼、 Ti合金、 2000系アルミ ニゥム合金、 7000系アルミニゥム合金等の金属材料で製作されたタ 一ビンブレー ドで特に好適である。 The diameter of the tip of the hammer 4 used for the ultrasonic impact treatment is preferably 0.5 mm to 2.0 mm. The reason is that if the diameter of the hammer exceeds 2 mm, the impact processing applied at one time is too wide compared to the size of the corrosion pit, and the effect of the impact processing does not reach the inner surface of the pit. If the diameter of the hammer is less than 0.5 mm, the inner surface of the pit will be sufficiently machined, but the diameter of the indent formed by the tip of the hammer will be too small to become a stress concentration area and the starting point of fatigue crack initiation This is because The present invention relates to SUS316L stainless steel, S US304 stainless steel, maraging steel, Ti alloy, and 2000 aluminum Particularly suitable is a turbine blade made of a metal material such as a nickel alloy or a 7000 series aluminum alloy.
本発明に使用する超音波発生装置は問わないが、 200 w〜 3 kwの 電源を用いて、 トランスデューサによって 19kHz〜60kHzの超音波振 動を発生させ、 ウェーブガイ ドにて増幅させることによ り、 Φ 0. 5 ~ 2. 0mmのピンからなる超音波振動端子を 20〜60 mの振幅で振動 させる装置が好ましい。  Although the ultrasonic generator used in the present invention is not limited, the ultrasonic vibration of 19 kHz to 60 kHz is generated by a transducer using a power supply of 200 w to 3 kw, and the ultrasonic vibration is amplified by a wave guide. A device that vibrates an ultrasonic vibration terminal composed of a pin having a diameter of 0.5 to 2.0 mm with an amplitude of 20 to 60 m is preferable.
図 4は、 本発明におけるタービンブレー ドの補修方法の効果を示 す図であり、 横軸はタービンプレー ドが全破断するまでの時間を 1 と したときの破断寿命を示し、 縦軸は深さが 5 μ mを超える腐食ピ ッ トの大きさ （平均直径 D ) を対数表示したものを示す。  FIG. 4 is a diagram showing the effect of the turbine blade repair method according to the present invention, in which the horizontal axis represents the fracture life when the time until the complete breakage of the turbine blade is set to 1, and the vertical axis represents the depth. The size of the corrosion pit (average diameter D) with a logarithm exceeding 5 μm is shown in logarithmic form.
図 4に示すよ うに、 腐食ピッ トの大きさ （平均直径 D ) は、 回転 機の操業時間と ともに徐々に大きくなり、 そのまま放置すると点線 で示すように、 疲労き裂が発生して急激に進展し全破断に至る。 そこで、 本発明によれば、 腐食ピッ トの大きさ （平均直径 D ) が 50 μ πι以上 （好ましく は 20 μ m以上） に成長する前に、 腐食ピッ ト の表面を超音波振動端子で打撃する超音波振動処理による補修を行 い、 図 4の矢印で示すように、 深さ 5 μ m以上の腐食ピッ トの大き さを数 μ mまで低減させて疲労き裂の発生を防止するので、 タ一ビ ンブレードは全破断に至ることはない。 さ らに、 この補修作業を繰 り返すことによって、 著しく タービンブレー ドの寿命を延長させ、 理論的には半永久的に使用することができるよ うになる。 実施例  As shown in Fig. 4, the size of the corrosion pit (average diameter D) gradually increases with the operating time of the rotating machine, and if left untouched, fatigue cracks occur and sharply increase as indicated by the dotted line. Evolves and leads to total fracture. Therefore, according to the present invention, before the size of the corrosion pit (average diameter D) grows to 50 μπι or more (preferably 20 μm or more), the surface of the corrosion pit is hit with an ultrasonic vibration terminal. As shown by the arrow in Fig. 4, the size of the corrosion pit with a depth of 5 μm or more is reduced to several μm to prevent the occurrence of fatigue cracks. However, the turbine blade does not result in total breakage. Furthermore, by repeating this repair work, the life of the turbine blade can be significantly extended, and theoretically it can be used semi-permanently. Example
本発明のタービンブレー ドの補修方法を、 製鉄所の高炉に熱風を 供給する送風機のタービンブレードに下記条件によ り適用した。 ぐ実施条件〉 送風機の回転数 ： 2000RPM The method for repairing a turbine blade of the present invention was applied to a turbine blade of a blower for supplying hot air to a blast furnace of a steelworks under the following conditions. Implementation conditions> Blower rotation speed: 2000RPM
タービンブレー ドの材質 ： SUS 316L系 ステンレス鋼 Turbine blade material: SUS 316L stainless steel
送風ガス ： NOx, SOxを含む熱風 Blast gas: Hot air containing NOx and SOx
6ヶ月間隔の定期点検時に、 タービンブレードの腐食ピッ トの表 面を、 先端部の直径が φ 2. 0mmのハンマで超音波衝撃処理を施した ところ、 0. 1mm以上のき裂の検出は 2年間認められなかった。  During periodic inspections at six-month intervals, the surface of the corrosion pit of the turbine blade was subjected to ultrasonic impact treatment with a hammer with a tip diameter of φ2.0 mm, and cracks larger than 0.1 mm were detected. Not approved for 2 years.
—方、 先端部の直径が φ 0. 1mmのハンマで超音波衝撃処理を施し たところ、 2年間で 0. lmmのき裂が観察された。  On the other hand, when ultrasonic impact treatment was performed using a hammer with a tip diameter of φ0.1 mm, a crack of 0.1 mm was observed in two years.
また、 超音波衝撃処理を行わなかった場合、 2年間で、 0. 5mmの き裂が多数発見され、 タービンブレー ドの交換が必要となった。 以上の結果によ り、 本発明のタービンブレー ドの補修方法によつ て、 タービンブレー ドの寿命を著しく延長できることが確認された  Without ultrasonic impact treatment, many 0.5 mm cracks were found in two years, requiring replacement of the turbine blade. From the above results, it was confirmed that the turbine blade repair method of the present invention can significantly extend the life of the turbine blade.
産業上の利用可能性 Industrial applicability
本発明によれば、 タ一ビンブレー ドに発生する腐食ピッ トの表面 に、 超音波振動端子による打撃処理を行う ことによ り、 腐食環境に ある回転体に取り付けられたタ一ビンブレー ドの補修方法を提供し 、 タービンブレードの寿命を著しく延長することができる。  According to the present invention, the surface of the corrosion pit generated on the turbine blade is subjected to a striking treatment by an ultrasonic vibration terminal, thereby repairing the turbine blade attached to the rotating body in a corrosive environment. A method is provided that can significantly extend the life of turbine blades.

Claims

請 求 の 範 囲 The scope of the claims
1 . 腐食環境にある回転体に取り付けられたタービンブレー ドの 補修方法であって、 前記タービンプレー ドの表面に発生する腐食ピ ッ トの平均径 ： Dが 50 μ m以上に成長する前に、 該腐食ピッ トの表 面に、 超音波振動端子で打撃する超音波衝擊処理を行う ことによ り 、 該腐食ピッ ト の深さ ： dを 5 μ πι以下とすることを特徴とするタ 一ビンブレー ドの補修方法。 1. A method for repairing a turbine blade attached to a rotating body in a corrosive environment, in which the average diameter of the corrosion pit generated on the surface of the turbine blade: before D grows to 50 μm or more. The surface of the corrosion pit is subjected to an ultrasonic impingement treatment by striking with an ultrasonic vibration terminal, so that the depth of the corrosion pit: d is set to 5 μπι or less. Repair method for one bin blade.
2 . 前記回転体が、 高炉用の送風機であることを特徴とする請求 項 1 に記载のタ一ビンブレー ドの補修方法。  2. The method for repairing a turbine blade according to claim 1, wherein the rotating body is a blower for a blast furnace.
PCT/JP2003/014333 2002-11-19 2003-11-11 Method of repairing turbine blade WO2004046560A1 (en)

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JP2002334510A JP4015929B2 (en) 2002-11-19 2002-11-19 Turbine or blower blade repair method

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