WO2010053023A1 - 蒸気タービンロータの製造方法及び蒸気タービンロータ - Google Patents
蒸気タービンロータの製造方法及び蒸気タービンロータ Download PDFInfo
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- WO2010053023A1 WO2010053023A1 PCT/JP2009/068412 JP2009068412W WO2010053023A1 WO 2010053023 A1 WO2010053023 A1 WO 2010053023A1 JP 2009068412 W JP2009068412 W JP 2009068412W WO 2010053023 A1 WO2010053023 A1 WO 2010053023A1
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- rotor
- turbine rotor
- steam turbine
- high temperature
- electrode
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- 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
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/06—Rotors for more than one axial stage, e.g. of drum or multiple disc type; Details thereof, e.g. shafts, shaft connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49316—Impeller making
Definitions
- the present invention relates to a steam turbine rotor manufacturing method and a steam turbine rotor, and more particularly to a steam turbine rotor manufacturing method for manufacturing a steam turbine rotor using electroslag remelting (hereinafter referred to as ESR), and the same.
- ESR electroslag remelting
- the present invention relates to the used steam turbine rotor.
- a steam turbine rotor is prepared by melting and refining raw materials so that they finally have a predetermined chemical composition, casting them into a mold and solidifying them, forging the solidified ingot and finishing it into a rotor shape to obtain a rotor forged product.
- the rotor forged product is heat-treated to form a rotor material, which is manufactured by machining the rotor material and implanting a moving blade.
- the obtained ingot was remelted (ESR) in an ESR furnace as an electrode and then solidified, and the obtained ESR ingot was forged into a rotor forged product.
- ESR remelted
- the obtained ESR ingot was forged into a rotor forged product.
- This rotor forged product In some cases, the rotor material is heat treated to form a rotor material, which is then machined and a rotor blade is implanted.
- the main aim of performing ESR is to improve the solidified structure, reduce component segregation, and remove impurities.
- Patent Document 1 manufactures a high-low pressure integrated turbine rotor by performing ESR processing using a plurality of hollow electrodes having chemical compositions corresponding to the chemical composition of each part of the steam turbine rotor. Techniques to do this are disclosed.
- JP 2001-50007 A and JP 2001-50002 A (Patent Documents 2 and 3) describe that high-medium-low pressure turbine rotors and low-pressure turbine rotors are obtained by combining rotor partial materials having different chemical compositions by ESR. Techniques for manufacturing are disclosed.
- a carbon dioxide emission control technology is attracting attention from the viewpoint of protecting the global environment, and the need for higher efficiency in power generation is also increasing.
- it is effective to increase the turbine steam temperature.
- the steam temperature has increased to 600 ° C. or higher.
- the applied steam turbine rotor is not suitable for ferritic heat resistant steel (1% CrMoV steel, 12% Cr steel, etc.). It tends to shift to heat-resistant alloys such as alloys. However, this heat-resistant alloy has a limit of production on the scale of a dozen tons by product weight due to restrictions on melting equipment. Further, the heat resistant alloy is more expensive than the ferritic heat resistant steel.
- the joint structure may be welded joint or bolt fastening, but in the case of welded joint, the rotor design and long-term reliability such as the occurrence of weld defects, weld deformation, weld residual stress, etc.
- bolt fastening it is necessary to make the rotor wheel space
- bolt fastening is applicable to a wheel structure, it is not applicable to a drum rotor structure.
- a first object of the present invention has been made in consideration of the above-mentioned circumstances, and a heat-resistant alloy having excellent high-temperature characteristics is used for a steam turbine rotor for a steam turbine that uses ultra-high temperature steam.
- An object of the present invention is to provide a method of manufacturing a steam turbine rotor that can be manufactured by overcoming the limitations on the manufacturing technology, and a steam turbine rotor to which the method is applied.
- a second object of the present invention is to provide a method for manufacturing a steam turbine rotor capable of manufacturing a steam turbine rotor for a steam turbine using ultra-high temperature steam at low cost and high quality, and a steam turbine rotor to which the steam turbine rotor is applied. There is.
- the present invention provided to solve the above-described object is a method for manufacturing a steam turbine rotor having an ultra-high temperature side portion through which ultra-high temperature steam flows and a high-temperature side portion through which high-temperature steam flows, Preparing a first electrode made of a chemical composition corresponding to the chemical composition of the heat-resistant alloy constituting the ultra-high temperature side part, and a second electrode made of a chemical composition corresponding to the chemical composition of the high-temperature side part, Having a joint at the peripheral edge of the longitudinal ends of the first and second electrodes; In a state where the cross-sectional area including the joint portion of the first and second electrodes is made smaller than the other electrode portions, the joint portions of the first and second electrodes are temporarily joined.
- the second electrode has a chemical composition different from that of the first electrode, and the high temperature side portion of the steam turbine rotor has a different chemical composition from the ultra high temperature side portion.
- the high temperature side portion is made of ferritic heat resistant steel.
- the ultrahigh temperature side portion and the high temperature side portion are simultaneously heat treated under predetermined heat treatment conditions corresponding to the respective chemical compositions.
- the second electrode has the same chemical composition as the first electrode, and the high temperature side portion of the steam turbine rotor is made of the same heat resistant alloy as the ultra high temperature side portion.
- the ultra-high temperature side portion and the high temperature side portion are simultaneously heat-treated under the same heat treatment conditions.
- the heat-resistant alloy constituting the ultra-high temperature side portion is a Ni-based superalloy.
- first and second electrodes have a solid structure, and only their joints are formed in a ring shape.
- first and second electrodes have a solid structure, and that these joint portions are formed so that only the outer peripheral side portions of the two electrodes protrude in the axial direction.
- first and second electrodes have a solid structure, and that these joint portions are formed so that only the central side portions of both electrodes protrude in the axial direction.
- the steam turbine rotor may be a high pressure turbine rotor, an intermediate pressure turbine rotor, or a high / medium pressure integrated turbine rotor.
- the object of the present invention can also be achieved by a steam turbine rotor manufactured by the method for manufacturing a steam turbine rotor according to claim 1.
- a steam turbine rotor of a steam turbine provided with a high-pressure turbine rotor, an intermediate-pressure turbine rotor, or a high-medium-pressure integrated turbine rotor, the rotor body and bearings provided on both sides of the rotor body
- a turbine blade provided on the rotor and disposed in the circumferential direction of the steam turbine rotor
- the steam turbine rotor has an ultra-high temperature side portion through which ultra-high temperature steam flows and a high-temperature side portion through which high-temperature steam flows, and has a chemical composition corresponding to the chemical composition of the heat-resistant alloy constituting the ultra-high temperature side portion.
- the electroslag remelting ingot obtained by melting is forged into a rotor shape to obtain a rotor forged product, the rotor material obtained by heat-treating the rotor forged product is machined, and the moving blade is further implanted. Characterized by being manufactured That, the steam turbine rotor.
- the first electrode is manufactured by melting the heat-resistant alloy, and electroslag remelting is performed using the first electrode and the other second electrode.
- electroslag remelting ingot is obtained, and the steam turbine rotor is manufactured through the rotor forging and the rotor material in order.
- the super-high temperature side portion of the steam turbine rotor is made of a heat-resistant alloy having excellent high-temperature strength, the soundness of the steam turbine rotor can be secured even for ultra-high temperature steam exceeding 600 ° C.
- the schematic sectional drawing which shows the steam turbine rotor manufactured by 1st Embodiment in the manufacturing method of the steam turbine rotor which concerns on this invention.
- the schematic partial side view which shows 1st Example of the joining structure of the electrode used for ESR for manufacturing the steam turbine rotor of FIG.
- the schematic partial side view which shows the 2nd Example of the joining structure of the electrode used for ESR for manufacturing the steam turbine rotor of FIG.
- the schematic partial side view which shows the 3rd Example of the joining structure of the electrode used for ESR for manufacturing the steam turbine rotor of FIG.
- the schematic partial side view which shows the 4th Example of the joining structure of the electrode used for ESR for manufacturing the steam turbine rotor of FIG.
- FIG. 7 is a chart showing the transition width of the composition transition region of an ESR ingot manufactured using the electrode bonding structure of each example of FIGS. 2 to 6 in comparison with the comparative example.
- a steam turbine rotor 10 shown in FIG. 1 is a high / medium pressure integrated turbine rotor, and includes a rotor body 11 and bearings 12 provided on both sides of the rotor body 11.
- a rotor blade 13 for a high pressure turbine and a rotor blade 14 for an intermediate pressure turbine are implanted in the rotor body 11.
- the rotor blades 13 for the high-pressure turbine are arranged in the rotor body 11 in the circumferential direction of the steam turbine rotor 10, and this array group is installed in a plurality of stages in the axial direction of the steam turbine rotor 10.
- a plurality of intermediate pressure turbine blades 14 are arranged in the rotor body 11 in the circumferential direction of the steam turbine rotor 10, and this array group is installed in a plurality of stages in the axial direction of the steam turbine rotor 10.
- the ultra-high-temperature steam is divided into a paragraph on the upstream side of the high-pressure turbine rotor blade 13 (a plurality of paragraphs near the center in the figure), It flows to the upstream paragraph (a plurality of paragraphs near the center in the figure) of the pressure turbine rotor blade 14. Accordingly, in the rotor body portion 11 of the steam turbine rotor 10, the ultra-high temperature side portion 15 including the portion through which the ultra-high temperature steam flows is made of a Ni-based alloy as a heat-resistant alloy excellent in high-temperature strength (for example, high-temperature creep rupture strength). Composed.
- trade name IN617 13Co-22Cr-9Mo-1Al-0.3Ti-residual Ni [wt%]
- trade name IN625 22Cr-9Mo-3.6Nb-0.2Al-0. 2Ti—residual Ni [wt%]
- the portion where the steam of 600 ° C. or less flows in the rotor body portion 11 and the portion of the bearing portion 12 serve as the high temperature side portion 16.
- the high temperature side portion 16 is made of a material having a chemical composition different from that of the super high temperature side portion 15, for example, ferritic heat resistant steel.
- ferritic heat resistant steel examples include 12% Cr steel (10.5Cr-1Mo-0.2V-0.07Nb-0.05N-1W-remaining Fe [wt%]), or 1% CrMoV steel (1Cr- 1.25Mo-0.25V-residual Fe [wt%]) is preferred.
- the steam turbine rotor 10 of FIG. 1 showed the case of the high-medium pressure integrated type turbine rotor, it may be a high-pressure turbine rotor or an intermediate-pressure turbine rotor.
- the raw material of the Ni-base superalloy constituting the ultra-high temperature side portion 15 is melted (including refining) so as to have a predetermined chemical composition and then solidified, and the chemistry of this Ni-base superalloy is made.
- a first electrode 17 (FIG. 5) having a chemical composition corresponding to the composition is prepared and prepared.
- the raw material of the ferritic heat resistant steel constituting the high temperature side portion 16 is melted (including refining) so as to have a predetermined chemical composition and then solidified, and the chemical composition corresponding to the chemical composition of the ferritic heat resistant steel
- the second electrode 18 (FIG. 5) is prepared and prepared.
- the first electrode 17 and the second electrode 18 have different chemical compositions as described above, but are both electrodes for ESR.
- the cross-sectional area of the joint portion 19A of the first electrode 17 and the cross-sectional area of the joint portion 20A of the second electrode 18 are formed smaller than the cross-sectional areas of the other portions of the electrodes 17 and 18 respectively.
- the first electrode 17 and the second electrode 18 have a solid structure, and only the joint portion 19A and the joint portion 20A are formed in a ring shape (first embodiment).
- the first electrode 17 and the second electrode 18 have a solid structure, and the joint portion 19B of the first electrode 17 and the joint portion 20B of the second electrode 18 are outer peripheral portions of the respective electrodes. Only the first electrode 17 and the inner side of the joint portion 19B of the first electrode 17 and the inner side of the joint portion 20B of the second electrode 18 are formed on an inclined surface (second embodiment). Example).
- the first electrode 17 and the second electrode 18 have a solid structure, and the joint portion 19C of the first electrode 17 and the joint portion 20C of the second electrode 18 are outer peripheral portions of the respective electrodes. Only the first electrode 17 is formed in a shape projecting in the axial direction, and the inside of the joint portion 19C in the first electrode 17 and the inside of the joint portion 20C in the second electrode 18 are each formed in a hemispherical shape (first 3 examples). Further, as shown in FIG. 5, the first electrode 17 and the second electrode 18 have a solid structure, and the joint portion 19D of the first electrode 17 and the joint portion 20D of the second electrode 18 are only in the central portion of each electrode. Is formed in a shape protruding in the axial direction (fourth embodiment).
- the joint portions 19A to 19D of the first electrode 17 and the joint portions 20A to 20D of the second electrode 18 are temporarily joined, for example, temporarily fixed by welding, and in this state, the first electrode 17 and the second electrode
- the electrode 18 is attached to the ESR furnace.
- the temporary joining position is indicated by reference numeral 25 in FIGS.
- ESR processing is performed using the first electrode 17 and the second electrode 18 that are temporarily joined, and the ESR ingot 21 (FIG. 7) is manufactured.
- an ultra-high temperature side portion 22 made of a Ni-base superalloy, a high-temperature side portion 23 made of a ferritic heat-resistant steel, a composition element of the Ni-base superalloy, and a composition of the ferritic heat-resistant steel There is a composition transition region 24 in which elements are mixed.
- the transition width W of the composition transition region 24 is a length in the longitudinal direction of the ESR ingot 21 within a range in which a difference of 20% or more is recognized for the composition elements composing the ultrahigh temperature side portion 22 and the high temperature side portion 23. Defined as displayed in For example, when the high temperature side portion 23 contains 5% of the A element and the ultra high temperature side portion 22 contains the same A element, the range of the A element in the composition transition region 24 is 6% to 8%.
- the transition width W of the composition transition region 24 is defined. In this case, since the distribution state differs depending on the composition element composing the ESR ingot 21, the transition width W is obtained for each composition element, and the maximum value among these transition widths W is the transition width W of the composition transition region 24. It is said.
- region 24 is narrow is preferable.
- the transition width W of the composition transition region 24 in the ESR ingot 21 when the first electrode 17 is IN617 and the second electrode 18 is 12% Cr steel is, as shown in FIG.
- the transition width W is 1, as shown in FIG. 8, the case of the junction structure of FIG. 2 is 0.41, the case of the junction structure of FIG. 3 is 0.32, and the case of the junction structure of FIG. 28 and 0.34 in the case of the joint structure of FIG. 5, which are values less than half of those in the case of the joint structure of FIG.
- the ESR ingot 21 produced as described above is forged into a rotor shape to produce a rotor forged product (not shown), and then this rotor forged product is heat treated to produce a rotor material (not shown). To do.
- the super high temperature side part (the same chemical composition as the super high temperature side part 22 in FIG. 7) and the high temperature side part (the same chemical composition as the high temperature side part 23 in FIG. 7) are It heat-processes simultaneously on the heat processing conditions (preferably optimal) suitable for chemical composition.
- the ultra-high temperature side and the high temperature side of the rotor forging are simultaneously heated at different heating temperatures and simultaneously cooled at different cooling rates.
- the Ni-based superalloy is melted to produce the first electrode 17, ESR is performed using the first electrode 17 and the second electrode 18, and the ESR ingot 21 is obtained. Since the steam turbine rotor 10 is manufactured after that, it is possible to manufacture the steam turbine rotor 10 by overcoming restrictions on the manufacturing of the Ni-base superalloy, such as inability to manufacture large parts.
- the super-high temperature side portion 15 of the steam turbine rotor 10 is made of a Ni-based superalloy excellent in high-temperature strength, the soundness of the steam turbine rotor 10 is also obtained against ultra-high temperature steam exceeding 600 ° C. Can be secured.
- the first electrode 17 for ESR is composed of an expensive Ni-base superalloy
- the second electrode 18 is composed of ferritic heat-resistant steel, so that these first electrode 17 and second electrode 18
- the steam turbine rotor 10 can be manufactured at low cost through the ESR ingot 21 manufactured using the
- the cross-sectional areas of the joint portions 19A to 19D of the first electrode 17 and the joint portions 20A to 20D of the second electrode 18 are larger than those of the other portions of the first electrode 17 and the second electrode 18, respectively. Is also formed small. For this reason, in the ESR using the first electrode 17 and the second electrode 18, the melting amount of the joints 19A to 19D and the joints 20A to 20D is reduced, so that the depth of the molten pool becomes shallow and the pool is It can be flattened and the solidification rate can be increased.
- the transition width W of the composition transition region 24 in the ESR ingot 21 can be narrowed, the quality of the steam turbine rotor 10 manufactured via the ESR ingot 21 becomes high, and the long-term operational reliability of the steam turbine rotor 10 is improved. Can be improved.
- the cross-sectional areas of the joint portions 19A to 19D of the first electrode 17 and the joint portions 20A to 20D of the second electrode 18 are larger than those of the other portions of the first electrode 17 and the second electrode 18, respectively. Therefore, the electrode lengths of the first electrode 17 and the second electrode 18 can be shortened as compared with the case where both the electrodes are hollow. Therefore, an ESR furnace or the like in which the first electrode 17 and the second electrode 18 are mounted can be downsized.
- the super-high temperature side portion (the same chemical composition as the ultra-high temperature side portion 22 in FIG. 7) and the high temperature side portion (the same chemistry as the high temperature side portion 23 in FIG. 7) are different. Are heat-treated at the same time under the heat treatment conditions optimum for each chemical composition. As a result, the material characteristics of each of the ultra-high temperature side portion and the high temperature side portion in the rotor forged product can be sufficiently exhibited.
- the super high temperature side portion 15 made of a Ni-base superalloy and the high temperature side portion 16 made of a ferritic heat resistant steel are joined by ESR processing, and welding joining and bolt fastening are performed. Since it is not used, it is a technology that accompanies joining such as defects that occur with welding (for example, welding deformation, residual stress, etc.) and defects that occur due to bolt fastening (increased rotor wheel spacing, non-adaptation to the drum rotor structure, etc.). Overcoming challenges.
- the temporary bonding of the peripheral portion is excellent.
- the temporary bonding of the peripheral portion is easier to hold the electrode than the case of temporary bonding including the central portion, the stability in terms of strength increases, and the stability against fluctuations in the melt liquid level that occurs during ESR bonding. It also has an advantage that the possibility that the shaft center of the portion not melted during ESR is shifted or dropped is extremely small.
- This embodiment differs from the above embodiment in that the super-high temperature side portion 15 and the high temperature side portion 16 of the steam turbine rotor 10 are made of the same heat-resistant alloy, for example, a Ni-base superalloy. Both the first electrode 17 and the second electrode 18 of the ESR for manufacturing the turbine rotor 10 are configured from a chemical composition corresponding to the chemical composition of the Ni-base superalloy.
- the super-high temperature side portion 22 and the high temperature side portion 23 of the ESR ingot 21 produced by the ESR process using the first electrode 17 and the second electrode 18 are both made of a Ni-base superalloy. Therefore, the composition transition region 24 does not exist.
- the rotor forged product produced by forging the ESR ingot 21 is subjected to heat treatment (heating and cooling) at the same time on the ultrahigh temperature side and the high temperature side under the optimum heat treatment conditions for the Ni-base superalloy.
- the first electrode 17 and the second electrode 18 for ESR may be formed with joint portions 19A to 19D and joint portions 20A to 20D, respectively, but the joint portions 19E and 20E are formed. It may be formed.
- the heat-resistant alloy constituting the ultra-high temperature side portion 15 is a Ni-based superalloy has been described, but the ferritic heat-resistant steel having the same or different chemical composition as the high-temperature side portion 16 Also good.
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Abstract
Description
本発明の第1の目的は、上述の事情を考慮してなされたものであり、超高温蒸気を使用する蒸気タービン用の蒸気タービンロータに、高温特性に優れた耐熱合金を用い、その製造技術上の制約を克服して製造できる蒸気タービンロータの製造方法、及びそれを適用した蒸気タービンロータを提供することにある。
前記超高温側部を構成する耐熱合金の化学組成に対応する化学組成からなる第1電極と、前記高温側部の化学組成に対応する化学組成からなる第2電極とを用意し、
第1及び第2の電極の長手方向の端部の周縁部分に接合部を有し、
これらの第1及び第2電極の前記接合部を含む断面積を他の電極部分よりも小さくした状態で、これらの第1及び第2電極の前記接合部どうしを仮接合し、
この仮接合された第1及び第2電極を用いてエレクトロスラグ再溶解して得られるエレクトロスラグ再溶解インゴットをロータ形状に鍛造してロータ鍛造品とし、
その後、このロータ鍛造品を熱処理してロータ素材とした後に、このロータ素材から前記蒸気タービンロータを製造することを特徴とする蒸気タービンロータの製造方法。
前記蒸気タービンロータは、超高温蒸気が流れる超高温側部と、高温蒸気が流れる高温側部とを有し、前記超高温側部を構成する耐熱合金の化学組成に対応する化学組成からなる第1電極と、前記高温側部の化学組成に対応する化学組成からなる第2電極との長手方向の端部の周縁部分に接合部を設け、これらの第1及び第2電極の前記接合部を含む断面積を他の電極部分よりも小さくした状態で、これらの第1及び第2電極の前記接合部どうしを仮接合し、この仮接合された第1及び第2電極を用いてエレクトロスラグ再溶解して得られたエレクトロスラグ再溶解インゴットをロータ形状に鍛造してロータ鍛造品とし、このロータ鍛造品を熱処理して得られたロータ素材を機械加工し、さらに前記動翼を植設して、製造されたことを特徴とする、蒸気タービンロータ。
図1に示す蒸気タービンロータ10は、高・中圧一体型タービンロータであり、ロータ胴部11と、このロータ胴部11の両側に設けられた軸受部12とを有して構成される。ロータ胴部11に、高圧タービン用の動翼13と、中圧タービン用の動翼14とが植設されている。高圧タービン用の動翼13は、ロータ胴部11において、蒸気タービンロータ10の周方向に複数枚配列され、この配列群が蒸気タービンロータ10の軸方向に複数段落設置される。また、中圧タービン用の動翼14は、ロータ胴部11において、蒸気タービンロータ10の周方向に複数枚配設され、この配列群が蒸気タービンロータ10の軸方向に複数段落設置される。
この第2の実施の形態において、前記第1の実施の形態と同様な部分については、同一の符号を付すことにより説明を簡略化し、または省略する。
Claims (13)
- 超高温蒸気が流れる超高温側部と、高温蒸気が流れる高温側部とを有する蒸気タービンロータの製造方法であって、
前記超高温側部を構成する耐熱合金の化学組成に対応する化学組成からなる第1電極と、前記高温側部の化学組成に対応する化学組成からなる第2電極とを用意し、
第1及び第2の電極の長手方向の端部の周縁部分に接合部を有し、
これらの第1及び第2電極の前記接合部を含む断面積を他の電極部分よりも小さくした状態で、これらの第1及び第2電極の前記接合部どうしを仮接合し、
この仮接合された第1及び第2電極を用いてエレクトロスラグ再溶解して得られるエレクトロスラグ再溶解インゴットをロータ形状に鍛造してロータ鍛造品とし、
その後、このロータ鍛造品を熱処理してロータ素材とした後に、このロータ素材から前記蒸気タービンロータを製造することを特徴とする蒸気タービンロータの製造方法。 - 前記第2電極が第1電極とは異なった化学組成からなり、蒸気タービンロータの高温側部が超高温側部と異なった化学組成から構成されることを特徴とする請求項1に記載の蒸気タービンロータの製造方法。
- 前記高温側部が、フェライト系耐熱鋼にて構成されることを特徴とする請求項2に記載の蒸気タービンロータの製造方法。
- 前記ロータ鍛造品の熱処理では、超高温側部と高温側部とを、それぞれの化学組成に対応した予め定めた熱処理条件で同時に熱処理することを特徴とする請求項2に記載の蒸気タービンロータの製造方法。
- 前記第2電極が第1電極と同一の化学組成からなり、蒸気タービンロータの高温側部が超高温側部と同一の耐熱合金から構成されることを特徴とする請求項1に記載の蒸気タービンロータの製造方法。
- 前記ロータ鍛造品の熱処理では、超高温側部と高温側部とを、同一の熱処理条件で同時に熱処理することを特徴とする請求項5に記載の蒸気タービンロータの製造方法。
- 前記超高温側部を構成する耐熱合金が、Ni基超合金であることを特徴とする請求項1に記載の蒸気タービンロータの製造方法。
- 前記第1及び第2電極は中実構造であり、これらの接合部のみがリング形状に形成されたことを特徴とする請求項1に記載の蒸気タービンロータの製造方法。
- 前記第1及び第2電極は中実構造であり、これらの接合部は、前記両電極の外周側部分のみが軸方向に突出した形状に形成されて構成されたことを特徴とする請求項1に記載の蒸気タービンロータの製造方法。
- 前記第1及び第2電極は中実構造であり、これらの接合部は、前記両電極の中央側部分のみが軸方向に突出した形状に形成されて構成されたことを特徴とする請求項1に記載の蒸気タービンロータの製造方法。
- 前記蒸気タービンロータが、高圧タービンロータ、中圧タービンロータ、または高・中圧一体型タービンロータであることを特徴とする請求項1に記載の蒸気タービンロータの製造方法。
- 上記請求項1に記載の蒸気タービンロータの製造方法により製造されたことを特徴とする蒸気タービンロータ。
- 高圧タービンロータ、中圧タービンロータ、または高・中圧一体型タービンロータ備えた蒸気タービンの蒸気タービンロータであって、ロータ胴部と、前記ロータ胴部の両側に設けられた軸受部と、前記ロータに設けられ、蒸気タービンロータの周方向に複数枚配設されるタービン用動翼と、を有し、
前記蒸気タービンロータは、超高温蒸気が流れる超高温側部と、高温蒸気が流れる高温側部とを有し、前記超高温側部を構成する耐熱合金の化学組成に対応する化学組成からなる第1電極と、前記高温側部の化学組成に対応する化学組成からなる第2電極との長手方向の端部の周縁部分に接合部を設け、これらの第1及び第2電極の前記接合部を含む断面積を他の電極部分よりも小さくした状態で、これらの第1及び第2電極の前記接合部どうしを仮接合し、この仮接合された第1及び第2電極を用いてエレクトロスラグ再溶解して得られたエレクトロスラグ再溶解インゴットをロータ形状に鍛造してロータ鍛造品とし、このロータ鍛造品を熱処理して得られたロータ素材を機械加工し、さらに前記動翼を植設して、製造されたことを特徴とする、蒸気タービンロータ。
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US13/127,517 US9856735B2 (en) | 2008-11-04 | 2009-10-27 | Method of manufacturing steam turbine rotor and steam turbine rotor |
EP09824723.2A EP2345792B1 (en) | 2008-11-04 | 2009-10-27 | Method for manufacturing a steam turbine rotor |
JP2010536741A JP5364721B2 (ja) | 2008-11-04 | 2009-10-27 | 蒸気タービンロータの製造方法及び蒸気タービンロータ |
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Cited By (2)
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EP2910734A1 (en) * | 2011-03-30 | 2015-08-26 | Mitsubishi Hitachi Power Systems, Ltd. | High and intermediate pressure steam turbine |
US10590508B2 (en) | 2014-10-10 | 2020-03-17 | Mitsubishi Hitachi Power Systems, Ltd. | Method for manufacturing shaft body |
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US20140335373A1 (en) * | 2013-05-08 | 2014-11-13 | General Electric Company | Joining process, joined article, and process of fabricating a joined article |
US9546551B2 (en) * | 2013-09-17 | 2017-01-17 | General Electric Company | Repaired turbine rotor wheel dovetail and related method |
CN104985161B (zh) * | 2015-07-24 | 2017-03-01 | 东北大学 | 真空电渣重熔制备双合金汽轮机转子钢锭的装置及方法 |
CN114058863A (zh) * | 2021-09-28 | 2022-02-18 | 材谷金带(佛山)金属复合材料有限公司 | 一种铝/钢电渣重熔复合方法 |
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US10590508B2 (en) | 2014-10-10 | 2020-03-17 | Mitsubishi Hitachi Power Systems, Ltd. | Method for manufacturing shaft body |
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EP2345792A1 (en) | 2011-07-20 |
JP5364721B2 (ja) | 2013-12-11 |
JPWO2010053023A1 (ja) | 2012-04-05 |
EP2345792A4 (en) | 2012-03-28 |
US20110229339A1 (en) | 2011-09-22 |
US9856735B2 (en) | 2018-01-02 |
EP2345792B1 (en) | 2019-05-15 |
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