US20050161124A1 - Titanium or titanium alloy contacting surface - Google Patents

Titanium or titanium alloy contacting surface Download PDF

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Publication number
US20050161124A1
US20050161124A1 US10/505,894 US50589404A US2005161124A1 US 20050161124 A1 US20050161124 A1 US 20050161124A1 US 50589404 A US50589404 A US 50589404A US 2005161124 A1 US2005161124 A1 US 2005161124A1
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United States
Prior art keywords
titanium
steel
alloy
weight
less
Prior art date
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Abandoned
Application number
US10/505,894
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English (en)
Inventor
Gerard Raisson
Dominique Cauvin
Didier Guichard
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.)
Aubert and Duval SA
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Individual
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
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Assigned to AUBERT & DUVAL reassignment AUBERT & DUVAL ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CAUVIN, DOMINIQUE, GUICHARD, DIDIER, RAISSON, GERALD
Publication of US20050161124A1 publication Critical patent/US20050161124A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • B22C9/061—Materials which make up the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2209—Selection of die materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/005—Castings of light metals with high melting point, e.g. Be 1280 degrees C, Ti 1725 degrees C
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium

Definitions

  • the present invention essentially relates to the use of a substantially nickel-free non-stainless low-alloy steel, for manufacturing at least the surface of an item intended to be put in contact with titanium or titanium alloy in the solid state, as well as to a method for manufacturing at least the surface of such an item with said steel.
  • titanium-based alloy or titanium alloy parts by means of a hot forming mold, or tools, made with different types of steel, is known. Hitherto, at least the portions of the molds or tools in contact with titanium and titanium alloys were made in a selected steel in order to prevent substantial reactions to surface diffusions with titanium and titanium alloys.
  • the steels used are carbon steels prepared by powder metallurgy (MdP), austenitic stainless steels for recoverable mold components (MdP), maraging steels, and high nickel refractory steels for isothermal, possibly superplastic forming.
  • the main object of the present invention is to solve the new technical problem consisting of selecting for surfaces in contact with titanium and titanium alloys, steel capable of preventing any substantial (measurable) reaction by surface diffusion of a component of this steel, and of iron, in particular, with titanium and titanium alloys.
  • An object of the invention is still to solve this technical problem according to a simple inexpensive solution, which may be used on an industrial scale for forming titanium or titanium alloy in the solid state.
  • the present invention relates to the use of a substantially nickel-free non-stainless low-alloy steel, for manufacturing at least the surface of an item intended to be put into contact with titanium or a titanium alloy for forming said titanium or titanium alloy in the solid state, for example, either for densifying and/or forming titanium or titanium alloy powders, or for forming bulk titanium or bulk titanium alloy.
  • said steel is used for manufacturing at least the contact surface of a mold for hot forming titanium or a titanium alloy in the solid state.
  • said steel is used for manufacturing tools for densifying and/or forming titanium or titanium alloy powders.
  • said steel is used for manufacturing tools for solid-state forming of bulk titanium or bulk titanium alloy.
  • forming is not limited to forming “final” parts, but may also comprise the forming of blanks for example, possibly followed by another operation, such as forging, die stamping or rolling.
  • a low alloy steel comprising less than 10% by weight of alloying elements, in particular, the steel comprises in weight percent:
  • the use is characterized in that the steel comprises from 0.1 to 4% by weight of molybdenum, preferably 0.1 to 2% by weight of molybdenum, still better from 0.15 to 1% by weight of molybdenum.
  • the use according to the invention is characterized in that the steel comprises from 0.05 to 4% by weight of vanadium, preferably from 0.05 to 2%, still better from 0.1 to 1%, by weight of vanadium.
  • the use according to any of the preceding claims is characterized in that the steel is 18CD4 grade steel.
  • the use according to any of the preceding claims is characterized in that the steel is 15CDV6 grade steel.
  • the present invention also covers a method for manufacturing at least a surface of an item intended to be put into contact with titanium or a titanium alloy for solid-state forming of said titanium or titanium alloy, for example, either for densifying and/or forming titanium or titanium alloy powders, or for forming bulk titanium or bulk titanium alloy, characterized in that it comprises the manufacturing of said surface with a substantially nickel-free, non-stainless low alloy steel, as defined earlier and in the following description, including examples which are integral parts of the invention, unless stated otherwise.
  • a substantially nickel-free, non-stainless low alloy steel as defined earlier and in the following description, including examples which are integral parts of the invention, unless stated otherwise.
  • the steel of the present invention it is notably possible to prevent sticking and diffusion in titanium or titanium alloys of the constituent elements of the steel of the invention.
  • the surface microstructure is not changed, unlike what is observed for steels of the prior art.
  • the manufacturing method comprises the manufacturing of at least the contact surface of a mold for hot forming titanium and a titanium alloy in the solid state.
  • the manufacturing method comprises the manufacturing of tools for densifying and/or forming titanium or titanium alloy powders.
  • the manufacturing method comprises the manufacturing of tools for solid-state forming of bulk titanium or bulk titanium alloy.
  • the method according to the invention is characterized in that hot forming is performed at a temperature at least equal to 500° C. and less than 1,000° C., preferably less than about 980° C.
  • the method is characterized in that molding of TA6V grade titanium parts is performed.
  • the method according to the invention is characterized in that pump impellers in a titanium-based alloy, in particular in a TA6V grade alloy, are manufactured by tools made in said low alloy steel produced by turning or milling.
  • the present invention further covers items comprising a contact surface intended to be put in contact with titanium or a titanium alloy for solid-state forming of titanium or a titanium alloy, for example, either for densifying and/or forming titanium or titanium alloy powders, or for the forming of bulk titanium or bulk titanium alloy, characterized in that at least said contact surface of the item is made with a substantially nickel-free non-stainless low alloy steel, notably as defined earlier and in the following description, including examples which are an integral part of the invention, unless stated otherwise, or as obtained by the method as defined earlier and in the following description, including the examples which are an integral part of the invention, unless stated otherwise.
  • the present invention further covers tools for densifying and/or forming titanium or titanium alloy powder, characterized in that at least the surface of the tools intended to be put into contact with titanium or the titanium alloy in the solid-state, is made in a non-stainless low alloy steel, as defined earlier and in the following description, including the examples which are an integral part of the invention, unless stated otherwise, or as obtained by the method as defined earlier and in the following description, including the examples which are an integral part of the invention, unless stated otherwise.
  • the present invention further covers tools for solid-state forming of bulk titanium or bulk titanium alloy, characterized in that at least the surface of the tools intended to be put into contact with titanium or the titanium alloy in the solid-state, is made in a non-stainless low alloy steel, as defined earlier and in the following description, including the examples which are an integral part of the invention, unless stated otherwise, or as obtained by the method as defined earlier and in the following description, including the examples which are an integral part of the invention, unless stated otherwise.
  • the present invention further covers molds for solid-state hot forming of titanium or a titanium alloy, for example either for densifying and/or forming titanium or titanium alloy powders, or for forming bulk titanium or bulk titanium alloy, characterized in that at least the surface of the mold intended to be put into contact with titanium or the titanium alloy in the solid-state, is made in a non-stainless low alloy steel, as defined earlier and in the following description, including the examples which are an integral part of the invention, unless stated otherwise, or as obtained by the method as defined earlier and in the following description, including the examples which are an integral part of the invention, unless stated otherwise.
  • the invention relates to supporting tools for heat treatment.
  • this steel has chromium content between 0.5 and 4% by weight, with nickel content less than 2.5% by weight and carbon content less than 1% by weight.
  • the steel in the use of the present invention may be implemented by forging, rolling, followed by machining or grinding or a cast steel.
  • this steel is in the annealed condition to improve dimensional reproducibility.
  • EX 3B PRIOR ART A3B XC18 69181 0.174 0.69 0.22 0.028 0.012 0.13 0.18 0.03 0.003
  • EX 4 PRIOR ART A4 XES 25003 0.12 0.64 0.23 0.03 0.013 N.A. 0.07 N.A. N.A.
  • Specimens were made from a cylindrical container of about 50 mm in diameter and about 70 mm in height.
  • the containers were filled with standard TA6V powder and 20*10*10 mm parallelipipedal inserts obtained by milling, made in soft steels of grades XES, XC18 (batch 23729), 18CD4 (batch A4791), 15CDV6 (batch 78384) and 100HLES (batch R2417), were placed inside the powder.
  • the containers were densified by hot isostatic compression with a plateau of 4h at 902° C. and 100 MPa.
  • the steel was removed by dissolving it in nitric acid. After densification, the following investigations were carried out:
  • HIC Hot Isostatic Compression
  • the steel-TA6V interfaces were subject to a micrographic examination in order to reveal possible diffusion between both materials. No diffusion was detected for the first two combinations. On the other hand, diffusion in places was revealed on the spark-machined combination TA6V ELI-15CDV6.
  • the ISOPREC® method it is possible to obtain shaped parts with good dimensional accuracy for which at least one portion of the surfaces is produced without any machine-finishing operation.
  • the part is produced by densification through HIC (hot isostatic compression) of stainless pre-alloyed powders in a non-stainless steel mold including a cavity, with calculated dimensions so as to obtain the desired final geometry.
  • the mold or the tool is removed by machining and dissolution in nitric acid.
  • Pump impellers were produced according to the ISOPREC® method, from TA6V and from steel tools produced by turning and milling. The following combinations were produced:
  • This method relates to supporting a half-sphere in standard TA6V with a diameter of 550 mm, with a thickness of 5 mm.
  • This half-sphere is brought to about 870° C. in vacuo for one hour, held by a tool with the same recessed geometry, made in 18CD4.
  • this steel may be used for producing a supporting tool for heat treatment, in order to suppress diffusion reactions, in particular by iron.
  • This blank was manufactured by hot isostatic compression (HIC) densification of a cylindrical container according to FIG. 1 , (for example, at 920° C.; 100 MPa, for 4 hours).
  • HIC hot isostatic compression
  • the cylindrical container ( 1 ) comprises a central core ( 10 ), an external container ( 20 ), as well as components ( 40 , 41 ) for sealing the ends.
  • This cylindrical container ( 1 ) has a recess ( 30 ) for collecting filling material, such as a powder ( 50 ) for example.
  • the thickness of the external container ( 20 ) was 3 mm.
  • the central core was in 18CD4 and the external container in XC18.
  • This container was filled with standard TA6V powder.
  • the obtained cylinder was scalped to a diameter of 45 mm in order to remove the XC18 container and the diffusion zones created upon densification.
  • the thereby obtained blank was forged at about 900-920° C. by compression of the diameter between plates to a height of 35 mm.
  • the central 18CD4 core was removed by dissolution in nitric acid.
US10/505,894 2003-08-01 2004-07-30 Titanium or titanium alloy contacting surface Abandoned US20050161124A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0309536 2003-08-01
FR0309536A FR2858331B1 (fr) 2003-08-01 2003-08-01 Surface en contact avec le titane ou un alliage de titane
PCT/FR2004/002054 WO2005012586A1 (fr) 2003-08-01 2004-07-30 Surface en contact avec le titane ou un alliage de titane

Publications (1)

Publication Number Publication Date
US20050161124A1 true US20050161124A1 (en) 2005-07-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
US10/505,894 Abandoned US20050161124A1 (en) 2003-08-01 2004-07-30 Titanium or titanium alloy contacting surface

Country Status (7)

Country Link
US (1) US20050161124A1 (fr)
EP (1) EP1649071A1 (fr)
JP (1) JP2007501326A (fr)
CN (1) CN1829814A (fr)
CA (1) CA2534070A1 (fr)
FR (1) FR2858331B1 (fr)
WO (1) WO2005012586A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1562042A (en) * 1919-05-03 1925-11-17 Gen Electric Process of preparing boron-iron alloys
US3615879A (en) * 1967-08-08 1971-10-26 Pont A Mousson Centrifugal mold for the casting of liquid metal and the process for producing said centrifugal mold
US4919735A (en) * 1988-12-29 1990-04-24 National Forge Company Khare pipe mold steel
US5053192A (en) * 1988-12-20 1991-10-01 Merzhanov Alexandr G Method for making products from powdered materials
US6280685B1 (en) * 1998-04-02 2001-08-28 Aubert & Duval Tool steel composition
US6311759B1 (en) * 1996-07-18 2001-11-06 The University Of Melbourne Semi-solid metal processing
US20030016723A1 (en) * 2000-11-15 2003-01-23 Forbes Jones Robin M. Refining and casting apparatus

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1439421A (en) * 1974-03-08 1976-06-16 British Steel Corp Centrifugal pipe mould
FR2528743A1 (fr) * 1982-06-18 1983-12-23 Commissariat Energie Atomique Procede et dispositif de fabrication de pieces minces de forme complexe par compaction isostatique a chaud
JPH02247302A (ja) * 1989-03-20 1990-10-03 Sumitomo Metal Ind Ltd チタンクラッド鋼管の製造方法
JPH036305A (ja) * 1989-06-01 1991-01-11 Sumitomo Electric Ind Ltd 熱間静水圧成形法
US5287910A (en) * 1992-09-11 1994-02-22 Howmet Corporation Permanent mold casting of reactive melt
US5330707A (en) * 1993-06-25 1994-07-19 National Forge Company Steel for making very large pipe molds
GB9413631D0 (en) * 1994-07-06 1994-09-14 Inco Engineered Prod Ltd Manufacture of forged components
JPH08134588A (ja) * 1994-11-01 1996-05-28 Nkk Corp 補修溶接性に優れたプリハードン金型用鋼および補修溶接性に優れたプリハードン金型用鋼材の製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1562042A (en) * 1919-05-03 1925-11-17 Gen Electric Process of preparing boron-iron alloys
US3615879A (en) * 1967-08-08 1971-10-26 Pont A Mousson Centrifugal mold for the casting of liquid metal and the process for producing said centrifugal mold
US5053192A (en) * 1988-12-20 1991-10-01 Merzhanov Alexandr G Method for making products from powdered materials
US4919735A (en) * 1988-12-29 1990-04-24 National Forge Company Khare pipe mold steel
US6311759B1 (en) * 1996-07-18 2001-11-06 The University Of Melbourne Semi-solid metal processing
US6280685B1 (en) * 1998-04-02 2001-08-28 Aubert & Duval Tool steel composition
US20030016723A1 (en) * 2000-11-15 2003-01-23 Forbes Jones Robin M. Refining and casting apparatus

Also Published As

Publication number Publication date
FR2858331B1 (fr) 2006-12-01
FR2858331A1 (fr) 2005-02-04
EP1649071A1 (fr) 2006-04-26
CA2534070A1 (fr) 2005-02-10
CN1829814A (zh) 2006-09-06
WO2005012586A1 (fr) 2005-02-10
JP2007501326A (ja) 2007-01-25

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Owner name: AUBERT & DUVAL, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:RAISSON, GERALD;CAUVIN, DOMINIQUE;GUICHARD, DIDIER;REEL/FRAME:016444/0485

Effective date: 20040730

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION