US20140093416A1 - Cast iron containing niobium and component - Google Patents

Cast iron containing niobium and component Download PDF

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Publication number
US20140093416A1
US20140093416A1 US14/033,613 US201314033613A US2014093416A1 US 20140093416 A1 US20140093416 A1 US 20140093416A1 US 201314033613 A US201314033613 A US 201314033613A US 2014093416 A1 US2014093416 A1 US 2014093416A1
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US
United States
Prior art keywords
alloy
weight
turbine
niobium
silicon
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US14/033,613
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English (en)
Inventor
Lutz Dekker
Guido Günther
Stefan Janssen
Susanne Michel
Alfred Scholz
Shilun Sheng
Babette Tonn
Mark Vierbaum
Stefan Wanjura
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Siemens AG
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Individual
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Publication date
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Publication of US20140093416A1 publication Critical patent/US20140093416A1/en
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHENG, SHILUN, Wanjura, Stefan, JANSSEN, STEFAN
Assigned to TECHNISCHE UNIVERSITAET DARMSTADT reassignment TECHNISCHE UNIVERSITAET DARMSTADT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHOLZ, ALFRED, LANGE, SUSANNE
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TECHNISCHE UNIVERSITAET DARMSTADT
Assigned to TECHNISCHE UNIVERSITAET CLAUSTHAL reassignment TECHNISCHE UNIVERSITAET CLAUSTHAL ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Dekker, Lutz, TONN, BABETTE
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TECHNISCHE UNIVERSITAET CLAUSTHAL
Assigned to FRIEDRICH WILHELMS-HUETTE EISENGUSS GMBH reassignment FRIEDRICH WILHELMS-HUETTE EISENGUSS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GUENTHER, GUIDO, Vierbaum, Mark
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FRIEDRICH WILHELMS-HUETTE EISENGUSS GMBH
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • C22C37/08—Cast-iron alloys containing chromium with nickel
    • 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
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
    • 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
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/10—Metals, alloys or intermetallic compounds
    • F05D2300/11—Iron
    • F05D2300/111—Cast iron

Definitions

  • the invention relates to a cast iron containing niobium as claimed in the claims and to a component as claimed in the claims
  • GJS alloys nodular cast iron
  • Molybdenum furthermore exhibits a very high susceptibility to segregation.
  • the invention consists in the fact that cobalt and/or niobium can partially replace molybdenum.
  • the working limitations presented by the previous GJS alloy can therefore be overcome.
  • the iron-based alloy according to the invention has high elongations for the application field in the temperature range of 450° C.-550° C., and has the following composition (in % by weight):
  • the proportion of silicon, cobalt, niobium and molybdenum is ⁇ 7.5% by weight, in particular ⁇ 6.5% by weight.
  • Niobium improves the endurance strength with a constantly high LCF strength and good toughness.
  • niobium brings about a higher high-temperature strength, as a result of which the working limitations are shifted to high temperatures.
  • Cobalt brings about a solid solution solidification, which has a positive effect on the properties of the alloy at high temperatures and given low stresses.
  • molybdenum added to the alloy (preferably 0.4%-1.0%) has a positive influence on the high-temperature strength (Rp0.2 and Rm in the elevated temperature range) and the endurance behavior (creep strength).
  • the proportion of cobalt in the alloy lies between 0.5% by weight and 1.5% by weight.
  • Magnesium obtains the nodular formation of the graphite and magnesium is preferably present in an amount of at least 0.03% by weight, at most 0.07% by weight.
  • chromium (Cr) is preferably present in an amount of at least 0.01% by weight, but at most 0.05% by weight, and this increases the oxidation resistance.
  • the alloy may comprise further elements.
  • the alloy optionally contains small minimum admixtures of
  • FIG. 1 shows a steam turbine
  • FIG. 2 shows a gas turbine
  • the component with the alloy has an optimal ferritic microstructure with nodular graphite.
  • the table shows exemplary iron-based alloys according to the invention (in % by weight) which have improved mechanical properties.
  • main alloying elements are:
  • the alloy preferably contains no vanadium (V) and/or titanium (Ti) and/or tantalum (Ta) and/or copper (Cu).
  • the ratio of C and Si should give an almost-eutectic composition, i.e. should correspond to a carbon equivalent CE of between 4.1% and 4.4%,
  • CE % ⁇ ⁇ by ⁇ ⁇ weight ⁇ ⁇ C + % ⁇ ⁇ by ⁇ ⁇ weight ⁇ ⁇ Si + % ⁇ ⁇ by ⁇ ⁇ weight ⁇ ⁇ P 3 .
  • FIG. 1 shows a steam turbine 300 , 303 having a turbine shaft 309 extending along an axis of rotation 306 .
  • the steam turbine comprises a high-pressure turbine part 300 and a medium-pressure turbine part 303 , each with an inner housing 312 and an outer housing 315 enclosing the latter.
  • the high-pressure turbine part 300 is, for example, configured in pot design.
  • the medium-pressure turbine part 303 is, for example, configured to be twin-streamed. It is likewise possible for the medium-pressure turbine part 303 to be configured to be single-streamed.
  • a bearing 318 is arranged along the axis of rotation 306 between the high-pressure turbine part 300 and the medium-pressure turbine part 303 , the turbine shaft 309 comprising a bearing region 321 in the bearing 318 .
  • the turbine shaft 309 is mounted on a further bearing 324 beside the high-pressure turbine part 300 .
  • the high-pressure turbine part 300 comprises a shaft seal 345 .
  • the turbine shaft 309 is sealed relative to the outer housing 315 of the medium-pressure turbine part 303 by two further shaft seals 345 .
  • the turbine shaft 309 in the high-pressure turbine part 300 comprises the high-pressure rotor blading 357 . With the associated rotor blades (not shown in more detail), this high-pressure rotor blading 357 constitutes a first blading region 360 .
  • the medium-pressure turbine part 303 comprises a central steam intake region 333 .
  • the turbine shaft 309 comprises a radially symmetric shaft shield 363 , a cover plate, on the one hand to divide the steam flow into the two streams of the medium-pressure turbine part 303 and also to prevent direct contact of the hot steam with the turbine shaft 309 .
  • the turbine shaft 309 comprises a second blading region 366 with the medium-pressure rotor blades 354 . The hot steam flowing through the second blading region 366 flows from the medium-pressure turbine part 303 out of a discharge port 369 to a low-pressure turbine part (not shown) connected downstream in terms of flow technology.
  • the turbine shaft 309 is composed for example of two turbine shaft parts 309 a and 309 b, which are connected firmly to one another in the region of the bearing 318 .
  • Each turbine shaft part 309 a, 309 b comprises a cooling line 372 formed as a central bore 372 a along the axis of rotation 306 .
  • the cooling line 372 is connected to the steam outlet region 351 via a feed line 375 comprising a radial bore 375 a.
  • the coolant line 372 is connected to a cavity (not shown in more detail) below the shaft shield.
  • the feed lines 375 are configured as a radial bore 375 a, so that “cold” steam from the high-pressure turbine part 300 can flow into the central bore 372 a.
  • the discharge line 372 also formed in particular as a radially directed bore 375 a, the steam passes through the bearing region 321 into the medium-pressure turbine part 303 and there onto the lateral surface 330 of the turbine shaft 309 in the steam intake region 333 .
  • the steam flowing through the cooling line is at a much lower temperature than the temporarily superheated steam flowing into the steam intake region 333 , so as to ensure effective cooling of the first rotor blade row 342 of the medium-pressure turbine part 303 and the lateral surface 330 in the region of this rotor blade row 342 .
  • FIG. 2 shows, by way of example, a partial longitudinal section through a gas turbine 100 .
  • the gas turbine 100 has a rotor 103 with a shaft 101 which is mounted such that it can rotate about an axis of rotation 102 and is also referred to as the turbine rotor.
  • the annular combustion chamber 110 is in communication with a, for example, annular hot-gas passage 111 , where, by way of example, four successive turbine stages 112 form the turbine 108 .
  • Each turbine stage 112 is formed, for example, from two blade or vane rings. As seen in the direction of flow of a working medium 113 , in the hot-gas passage 111 a row of guide vanes 115 is followed by a row 125 formed from rotor blades 120 .
  • the guide vanes 130 are secured to an inner housing 138 of a stator 143 , whereas the rotor blades 120 of a row 125 are fitted to the rotor 103 for example by means of a turbine disk 133 .
  • a generator or a working machine (not shown) is coupled to the rotor 103 .
  • the compressor 105 While the gas turbine 100 is operating, the compressor 105 sucks in air 135 through the intake housing 104 and compresses it. The compressed air provided at the turbine-side end of the compressor 105 is passed to the burners 107 , where it is mixed with a fuel. The mix is then burnt in the combustion chamber 110 , forming the working medium 113 . From there, the working medium 113 flows along the hot-gas passage 111 past the guide vanes 130 and the rotor blades 120 . The working medium 113 is expanded at the rotor blades 120 , transferring its momentum, so that the rotor blades 120 drive the rotor 103 and the latter in turn drives the generator coupled to it.
  • the annular combustion chamber 110 is in communication with a, for example, annular hot-gas passage 111 , where, by way of example, four successive turbine stages 112 form the turbine 108 .
  • Each turbine stage 112 is formed, for example, from two blade or vane rings. As seen in the direction of flow of a working medium 113 , in the hot-gas passage 111 a row of guide vanes 115 is followed by a row 125 formed from rotor blades 120 .
  • the guide vanes 130 are secured to an inner housing 138 of a stator 143 , whereas the rotor blades 120 of a row 125 are fitted to the rotor 103 for example by means of a turbine disk 133 .
  • a generator or a working machine (not shown) is coupled to the rotor 103 .
  • the compressor 105 While the gas turbine 100 is operating, the compressor 105 sucks in air 135 through the intake housing 104 and compresses it. The compressed air provided at the turbine-side end of the compressor 105 is passed to the burners 107 , where it is mixed with a fuel. The mix is then burnt in the combustion chamber 110 , forming the working medium 113 . From there, the working medium 113 flows along the hot-gas passage 111 past the guide vanes 130 and the rotor blades 120 . The working medium 113 is expanded at the rotor blades 120 , transferring its momentum, so that the rotor blades 120 drive the rotor 103 and the latter in turn drives the generator coupled to it.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
US14/033,613 2012-10-01 2013-09-23 Cast iron containing niobium and component Abandoned US20140093416A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012217892.9 2012-10-01
DE102012217892.9A DE102012217892A1 (de) 2012-10-01 2012-10-01 Gusseisen mit Niob und Bauteil

Publications (1)

Publication Number Publication Date
US20140093416A1 true US20140093416A1 (en) 2014-04-03

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Family Applications (1)

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US14/033,613 Abandoned US20140093416A1 (en) 2012-10-01 2013-09-23 Cast iron containing niobium and component

Country Status (5)

Country Link
US (1) US20140093416A1 (de)
EP (1) EP2712943A3 (de)
CN (1) CN103710614A (de)
DE (1) DE102012217892A1 (de)
RU (1) RU2639194C2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016145377A (ja) * 2015-02-06 2016-08-12 日産自動車株式会社 球状黒鉛鋳鉄及び自動車用エンジンの排気系部品
CN111074145A (zh) * 2019-12-05 2020-04-28 江苏吉鑫风能科技股份有限公司 一种低温韧性超厚大端面铁素体球墨铸铁件及其制备方法
US10662510B2 (en) * 2016-04-29 2020-05-26 General Electric Company Ductile iron composition and process of forming a ductile iron component
US11618937B2 (en) * 2019-10-18 2023-04-04 GM Global Technology Operations LLC High-modulus, high-strength nodular iron and crankshaft

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104342594A (zh) * 2014-12-02 2015-02-11 江苏金洋机械有限公司 一种用于制备高铁扣件用铁垫板的合金

Citations (9)

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US3909252A (en) * 1973-11-01 1975-09-30 Suzuki Motor Co Wear-resistant cast iron for sliding surfaces
GB1482724A (en) * 1974-06-14 1977-08-10 Goetzewerke Wear-resistant cast-iron alloy
GB1506947A (en) * 1974-11-30 1978-04-12 Goetzewerke Sealing strip for rotary piston engines
US4435226A (en) * 1981-12-01 1984-03-06 Goetze Ag Wear resistant cast iron alloy with spheroidal graphite separation and manufacturing method therefor
US20040071574A1 (en) * 2002-10-10 2004-04-15 Eckard Bez Piston machine for delivering gases
US20040071584A1 (en) * 2002-07-26 2004-04-15 Erre-Vis S.P.A. Spheroidal cast iron particularly for piston rings and method for obtaining a spheroidal cast iron
US20080308193A1 (en) * 2004-03-04 2008-12-18 Yoshio Igarashi Heat-Resistant Cast Iron And Exhaust Equipment Member Formed Thereby
US20110211986A1 (en) * 2008-12-18 2011-09-01 Takashi Arai Ductile iron
WO2012139864A1 (de) * 2011-04-15 2012-10-18 Siemens Aktiengesellschaft Gusseisen mit niob und bauteil

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DE2428822A1 (de) * 1974-06-14 1976-01-02 Goetzewerke Sphaerogusseisenlegierung mit erhoehter verschleissbestaendigkeit
DE3926479A1 (de) 1989-08-10 1991-02-14 Siemens Ag Rheniumhaltige schutzbeschichtung, mit grosser korrosions- und/oder oxidationsbestaendigkeit
WO1991002108A1 (de) 1989-08-10 1991-02-21 Siemens Aktiengesellschaft Hochtemperaturfeste korrosionsschutzbeschichtung, insbesondere für gasturbinenbauteile
SU1700087A1 (ru) * 1990-02-22 1991-12-23 Всесоюзный Заочный Политехнический Институт Чугун
FR2681878B1 (fr) * 1991-09-26 1993-12-31 Centre Tech Ind Fonderie Fonte a graphite spherouidal resistant a la chaleur.
EP0786017B1 (de) 1994-10-14 1999-03-24 Siemens Aktiengesellschaft Schutzschicht zum schutz eines bauteils gegen korrosion, oxidation und thermische überbeanspruchung sowie verfahren zu ihrer herstellung
EP1306454B1 (de) 2001-10-24 2004-10-06 Siemens Aktiengesellschaft Rhenium enthaltende Schutzschicht zum Schutz eines Bauteils gegen Korrosion und Oxidation bei hohen Temperaturen
WO1999067435A1 (en) 1998-06-23 1999-12-29 Siemens Aktiengesellschaft Directionally solidified casting with improved transverse stress rupture strength
US6231692B1 (en) 1999-01-28 2001-05-15 Howmet Research Corporation Nickel base superalloy with improved machinability and method of making thereof
JP2003529677A (ja) 1999-07-29 2003-10-07 シーメンス アクチエンゲゼルシヤフト 耐熱性の構造部材及びその製造方法
DE50112339D1 (de) 2001-12-13 2007-05-24 Siemens Ag Hochtemperaturbeständiges Bauteil aus einkristalliner oder polykristalliner Nickel-Basis-Superlegierung
JP2003221639A (ja) * 2002-01-31 2003-08-08 Aisin Takaoka Ltd タービンハウジング一体型排気マニホルド及びその製造方法
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909252A (en) * 1973-11-01 1975-09-30 Suzuki Motor Co Wear-resistant cast iron for sliding surfaces
GB1482724A (en) * 1974-06-14 1977-08-10 Goetzewerke Wear-resistant cast-iron alloy
GB1506947A (en) * 1974-11-30 1978-04-12 Goetzewerke Sealing strip for rotary piston engines
US4435226A (en) * 1981-12-01 1984-03-06 Goetze Ag Wear resistant cast iron alloy with spheroidal graphite separation and manufacturing method therefor
US20040071584A1 (en) * 2002-07-26 2004-04-15 Erre-Vis S.P.A. Spheroidal cast iron particularly for piston rings and method for obtaining a spheroidal cast iron
US20040071574A1 (en) * 2002-10-10 2004-04-15 Eckard Bez Piston machine for delivering gases
US20080308193A1 (en) * 2004-03-04 2008-12-18 Yoshio Igarashi Heat-Resistant Cast Iron And Exhaust Equipment Member Formed Thereby
US20110211986A1 (en) * 2008-12-18 2011-09-01 Takashi Arai Ductile iron
WO2012139864A1 (de) * 2011-04-15 2012-10-18 Siemens Aktiengesellschaft Gusseisen mit niob und bauteil
US20140030133A1 (en) * 2011-04-15 2014-01-30 Lutz Dekker Cast iron containing niobium and component

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016145377A (ja) * 2015-02-06 2016-08-12 日産自動車株式会社 球状黒鉛鋳鉄及び自動車用エンジンの排気系部品
US10662510B2 (en) * 2016-04-29 2020-05-26 General Electric Company Ductile iron composition and process of forming a ductile iron component
US11618937B2 (en) * 2019-10-18 2023-04-04 GM Global Technology Operations LLC High-modulus, high-strength nodular iron and crankshaft
CN111074145A (zh) * 2019-12-05 2020-04-28 江苏吉鑫风能科技股份有限公司 一种低温韧性超厚大端面铁素体球墨铸铁件及其制备方法

Also Published As

Publication number Publication date
RU2639194C2 (ru) 2017-12-20
DE102012217892A1 (de) 2014-05-15
EP2712943A3 (de) 2016-11-09
EP2712943A2 (de) 2014-04-02
CN103710614A (zh) 2014-04-09
RU2013143927A (ru) 2015-04-10

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