GB1360747A - Method of producing directionally solidified cast alloy articles - Google Patents

Method of producing directionally solidified cast alloy articles

Info

Publication number
GB1360747A
GB1360747A GB5167172A GB5167172A GB1360747A GB 1360747 A GB1360747 A GB 1360747A GB 5167172 A GB5167172 A GB 5167172A GB 5167172 A GB5167172 A GB 5167172A GB 1360747 A GB1360747 A GB 1360747A
Authority
GB
United Kingdom
Prior art keywords
mould
alloy
columnar
grained
flask
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.)
Expired
Application number
GB5167172A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of GB1360747A publication Critical patent/GB1360747A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • B22D27/045—Directionally solidified castings

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

1360747 Casting processes GENERAL MOTORS CORP 9 Nov 1972 [15 Feb 1972] 51671/72 Heading B3F A columnar-grained unidirectionally solidified cast alloy article (e.g. a turbine blade) is made by pouring a molten alloy into a ceramic mould having an open-ended cavity, allowing the alloy partially or wholly to solidify, reheating the mould and the alloy to a temperature above the melting range of the alloy and allowing the mould to cool with the open end of the mould cavity in contact with a chill plate. When casting turbine blades a shell-mould 10 is provided with a branched runner system 16 leading to several blade-forming cavities 12 (each having an open end 13) from a sprue 14. The mould 10 is located in a tapered flask 20 (having an asbestos layer 23) upon a heat-insulated support 13. The mould having been preheated to, e.g. 2000‹ F., the mould/flask assembly is located in a vacuum chamber (not shown) and molten alloy, e.g. at 2900‹ F. poured into the mould. The alloy is allowed to solidify, at least in the open ends 13 of the cavities 12 and removed from the vacuum chamber on to a chill-plate 18. Pebbles 23 of exothermic composition, e.g. burning at 3100‹ F. are packed around the mould and ignited to remelt the alloy. Due to the tapering shape of the flask 20 a temperature gradient is set up in the mould and the alloy cools from the base upwardly to form columnar-grained unidirectionally solidified castings. An air-tight hood 30 may cover the mould whilst the metal solidifies and hexamethylenetetra-amine may be placed in the sprue 14 to evaporate and form a reducing atmosphere. Inert gas, e.g. Ar can be introduced into the hood 30. In order to form a turbine blade where the root has an equiaxed structure and the airfoil part has a columnar grained structure only that part of the cast alloy forming the airfoil is remelted.
GB5167172A 1972-02-15 1972-11-09 Method of producing directionally solidified cast alloy articles Expired GB1360747A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US22649172A 1972-02-15 1972-02-15

Publications (1)

Publication Number Publication Date
GB1360747A true GB1360747A (en) 1974-07-24

Family

ID=22849119

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5167172A Expired GB1360747A (en) 1972-02-15 1972-11-09 Method of producing directionally solidified cast alloy articles

Country Status (3)

Country Link
US (1) US3754592A (en)
CA (1) CA992723A (en)
GB (1) GB1360747A (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926245A (en) * 1973-09-28 1975-12-16 Gen Motors Corp Method for producing directionally solidified cast alloy articles and apparatus therefor
US4062399A (en) * 1975-12-22 1977-12-13 Howmet Turbine Components Corporation Apparatus for producing directionally solidified castings
GB2112309B (en) * 1981-12-23 1986-01-02 Rolls Royce Making a cast single crystal article
US4850419A (en) * 1982-09-01 1989-07-25 Trw Inc. Method of casting a one-piece wheel
US4550764A (en) * 1983-12-22 1985-11-05 Trw Inc. Apparatus and method for casting single crystal articles
US5042561A (en) * 1988-03-30 1991-08-27 Hitchiner Manufacturing Co., Inc. Apparatus and process for countergravity casting of metal with air exclusion
US5607007A (en) * 1994-10-19 1997-03-04 Hitchiner Manufacturing Co., Inc. Directional solidification apparatus and method
US6443215B1 (en) * 1998-12-31 2002-09-03 Hayes Lemmerz International, Inc. Vehicle wheel mold with a retractable ball cap
US6446698B1 (en) * 2001-03-12 2002-09-10 Howmet Research Corporation Investment casting with exothermic material
TWI403372B (en) * 2007-12-28 2013-08-01 Chung Shan Inst Of Science The methods of fabricating high quality integrally cast turbine wheel
US8870999B2 (en) * 2011-11-04 2014-10-28 GM Global Technology Operations LLC Apparatus and method for degassing cast aluminum alloys
US20140030545A1 (en) * 2012-07-27 2014-01-30 United Technologies Corporation Article With Grouped Grain Patterns
CN103192063B (en) * 2013-04-01 2015-03-11 东方电气集团东方汽轮机有限公司 Casting mold for producing high-temperature alloy single crystal blades and directional solidification device thereof
CN110315033A (en) * 2019-07-04 2019-10-11 深圳市万泽中南研究院有限公司 Ceramic shell mould and its manufacturing method for casting single crystal blade

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE543809C (en) * 1927-08-04 1932-02-10 Heraeus Vacuumschmelze Akt Ges Process for the production of the refractory lining for metallurgical furnaces, in particular induction furnaces
US2951272A (en) * 1958-09-22 1960-09-06 Gen Electric Method and apparatus for producing grain-oriented ingots
US3204301A (en) * 1960-10-24 1965-09-07 M C Flemings Jr Casting process and apparatus for obtaining unidirectional solidification
US3441078A (en) * 1967-02-01 1969-04-29 Trw Inc Method and apparatus for improving grain structures and soundness of castings
US3667533A (en) * 1970-04-28 1972-06-06 United Aircraft Corp Making directionally solidified castings

Also Published As

Publication number Publication date
US3754592A (en) 1973-08-28
CA992723A (en) 1976-07-13

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee