US20200024691A1 - Metal member and manufacturing method thereof - Google Patents

Metal member and manufacturing method thereof Download PDF

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Publication number
US20200024691A1
US20200024691A1 US16/495,736 US201816495736A US2020024691A1 US 20200024691 A1 US20200024691 A1 US 20200024691A1 US 201816495736 A US201816495736 A US 201816495736A US 2020024691 A1 US2020024691 A1 US 2020024691A1
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United States
Prior art keywords
powder
metal
reinforcing
metal member
grain size
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Abandoned
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US16/495,736
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English (en)
Inventor
Kenji Suzuki
Kazuki HANAMI
Tadayuki Hanada
Hisashi KITAGAKI
Shuntaro TERAUCHI
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Mitsubishi Heavy Industries Aero Engines Ltd
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Mitsubishi Heavy Industries Aero Engines Ltd
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Assigned to MITSUBISHI HEAVY INDUSTRIES AERO ENGINES, LTD. reassignment MITSUBISHI HEAVY INDUSTRIES AERO ENGINES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HANAMI, Kazuki, KITAGAKI, Hisashi, TERAUCHI, Shuntaro, HANADA, TADAYUKI, SUZUKI, KENJI
Publication of US20200024691A1 publication Critical patent/US20200024691A1/en
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
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • B22F1/0007—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2302/00—Metal Compound, non-Metallic compound or non-metal composition of the powder or its coating
    • B22F2302/10—Carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2302/00—Metal Compound, non-Metallic compound or non-metal composition of the powder or its coating
    • B22F2302/10—Carbide
    • B22F2302/105—Silicium carbide (SiC)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2302/00—Metal Compound, non-Metallic compound or non-metal composition of the powder or its coating
    • B22F2302/20—Nitride
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2302/00—Metal Compound, non-Metallic compound or non-metal composition of the powder or its coating
    • B22F2302/40—Carbon, graphite
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides

Definitions

  • the present invention is related to metal member using metal powder as material and manufacturing method thereof.
  • Metal powder injection molding is a method of manufacturing a metal powder molded article by melting a molding material, which results by mixing fine metal powder and organic binder (for example, a mixture of a plurality of types of resins; hereinafter called “binder”) to perform injection molding thereof and then performing degreasing and incinerating thereof.
  • binder for example, a mixture of a plurality of types of resins
  • the fine metal powder used in metal powder injection molding is formed in a fine powder production process by a spray method, for example.
  • Patent literature 1 discloses an invention of setting a concentration of titan in the nickel based alloy equal to or less than 0.1 mass % and an invention of performing an adjustment to decrease a concentration of niobium in a case where the concentration of titan is more than 1 mass %, in order to prevent this “pouring blockage”.
  • Patent Literature 1 Japanese patent publication No. 2005-350710 A
  • a metal manufactured by metal powder injection molding has lower strength at high temperatures compared to a metal manufactured by casting or forging and could not be applied to members needing strength at high temperatures.
  • an objective of the present invention is to manufacture a metal member with high strength at high temperatures by metal powder injection molding.
  • a metal member related to a first aspect of the present invention is provided with crystal grains of a metal and a granular reinforcing substance formed at boundaries of the crystal grains.
  • the reinforcing substance includes grains of a shape with a grain area equivalent grain size larger than 1/100 of a grain area equivalent grain size of the crystal grains.
  • the above mentioned reinforcing substance preferably includes grains with a grain area equivalent grain size smaller than 1 ⁇ 5 of the grain area equivalent grain size of the crystal grains.
  • the above mentioned reinforcing substance preferably includes grain of a shape so that a value of a length, in a first direction in which a length thereof is longest, divided by a length of a longest part in a direction orthogonal to the first direction is smaller than 5.
  • the above mentioned reinforcing substance includes a plurality of types of substances and is formed to surround the crystal grains.
  • the above mentioned reinforcing substance preferably includes any of carbon, nitrogen or oxygen.
  • a manufacturing method of metal member by injection molding related to a second target of the present invention includes a mixing step of mixing metal powder, reinforcing powder and binder, an injection molding step of forming an injection molded body by injection molding of mixed powders, a degreasing step of removing the binder from the injection molded body and forming an intermediate molded body, and an incinerating step of incinerating the intermediate molded body.
  • the reinforcing powder includes a reinforcing substance.
  • a maximal grain size of the reinforcing powder is larger than 1/100 of a maximal grain size of the metal powder.
  • the metal powder and the reinforcing powder both are mixed in a powder state in the mixing step.
  • the maximal grain size of the above mentioned reinforcing powder is preferably smaller than 1 ⁇ 5 of a maximal grain size of the metal powder.
  • a step of determining a carbon concentration of the metal powder in accordance with a mass of the reinforcing powder to be mixed is further included.
  • a metal member with a high strength at high temperatures can be manufactured by metal powder injection molding.
  • FIG. 1 is a flowchart showing processes of a manufacturing method related to the present invention.
  • FIG. 2 is structure photography by backscattered electron imaging in connection with a cross sectional surface of a metal member related to the present invention.
  • FIG. 3 is a mapping image of titan concentration by Electron Probe Micro Analyzer (EPMA) analysis in connection with a cross sectional surface of the metal member related to the present invention.
  • EPMA Electron Probe Micro Analyzer
  • FIG. 4 is a mapping image of carbon concentration by EPMA analysis in connection with a cross sectional surface of the metal member related to the present invention.
  • FIG. 5 is a schematic drawing showing a structure of the metal member related to the present invention.
  • FIG. 6 is a graph showing tensile strengths of the metal member related to the present invention and a metal member manufactured by conventional injection molding.
  • FIG. 7 is a graph showing elongations of the metal member related to the present invention and the metal member manufactured by conventional injection molding.
  • FIG. 8 is structure photography by backscattered electron imaging in connection with a cross sectional surface of a metal member manufactured by a conventional injection molding.
  • FIG. 9 is a mapping image of titan concentration by EPMA analysis in connection with a cross sectional surface of the metal member manufactured by a conventional injection molding.
  • FIG. 10 is a mapping image of carbon concentration by EPMA analysis in connection with a cross sectional surface of the metal member manufactured by a conventional injection molding.
  • FIG. 11 is a schematic drawing showing a structure of the metal member manufactured by a conventional injection molding.
  • FIG. 12 is structure photography by secondary electron imaging in connection with a cross sectional surface of a metal member manufactured by casting.
  • FIG. 13 is a mapping image of titan concentration by EPMA analysis in connection with a cross sectional surface of the metal member manufactured by casting.
  • FIG. 14 is a mapping image of carbon concentration by EPMA analysis in connection with a cross sectional surface of the metal member manufactured by casting.
  • FIG. 15 is a schematic drawing showing a structure of the metal member manufactured by casting.
  • FIG. 16 is a graph showing tensile strengths of the metal members with different carbon concentrations manufactured by a conventional injection molding.
  • FIG. 17 is a graph showing elongations of the metal members with different carbon concentrations manufactured by a conventional injection molding.
  • a metal is manufactured by including reinforcing substance including a substance such as carbon, oxygen, nitrogen or the like. This reinforcing substance also reinforces crystal grains boundaries.
  • metal powder injection molding grain surfaces are molten and grains are bonded to each other to be molded as a member. That is, in metal powder injection molding, grains are not entirely molten. For this reason, a metal manufactured by metal powder injection molding has weaker strength at boundaries of crystal grains, compared to metals manufactured by casting, forging or the like. The applicant found out that a cause thereof is that, not only voids are likely to enter at boundaries of crystal grains, but substance reinforcing boundaries of crystal grains is held inside metal grains.
  • a metal has been manufactured by metal powder injection molding, by use of reinforcing substance including metal powder of nickel based alloy including titanium carbide.
  • reinforcing substance including metal powder of nickel based alloy including titanium carbide.
  • FIGS. 8 to 10 it is understood that titanium carbide of a reinforcing substance is distributed throughout a cross sectional surface of the metal. That is, the reinforcing substance is held inside metal grains and is not precipitated from inside metal grains to boundaries of crystal grains.
  • the reinforcing substance 120 is distributed inside crystal grains 110 , however is not precipitated at boundaries of crystal grains 110 , as shown in FIG. 11 . In other words, reinforcing influence by the reinforcing substance 120 is small at boundaries of crystal grains 110 .
  • the crystal grains themselves are hardly divided due to reinforcing substance and strength of metal incinerated bodies is high at a low temperature environment.
  • the reinforcing substance is not precipitated at boundaries of crystal grains, the crystal grains are easily divided at boundaries and strength of the metal member at high temperatures is low.
  • a metal has been manufactured by casting, by use of reinforcing substance including metal powder of nickel based alloy including titanium carbide.
  • titanium carbide of the reinforcing substance is precipitated at boundaries of crystal grains. That is, it is understood that since grains are entirely molten in casting, titanium carbide precipitates from inside crystal grains to boundaries of crystal grains.
  • FIG. 15 By schematically showing, as shown in FIG. 15 , since grains are entirely molten, the reinforcing substance 220 inside the crystal grains 210 precipitates at boundaries of crystal grains 210 as reinforcing substance 230 For this reason, there is a few amount of reinforcing substance 220 inside crystal grains 210 .
  • a metal member A has been manufactured by metal powder injection molding by using metal powder of nickel based alloy with a carbon concentration of 0.02 mass % with respect to the entire metal powder.
  • a metal member B has been manufactured by using metal powder of nickel based alloy with a carbon concentration of 0.06 mass %.
  • the carbon concentration in the metal member A after manufacturing was 0.06 mass % with respect to the entire metal member A.
  • the carbon concentration in the metal member B was 0.12 mass %.
  • the tensile strength of the metal member A is approximatively 470 MPa.
  • the tensile strength of the metal member B is approximatively 5.50 MPa: the metal member B with a higher carbon concentration has a higher tensile strength.
  • the elongation of the metal member A is, as shown in FIG. 17 , approximatively 5%.
  • the elongation of the metal member B is approximatively 3%: the metal member A with a lower carbon concentration has a higher elongation. That is, in general, the higher the carbon concentration is, the higher the tensile strength becomes and the smaller the elongation becomes.
  • a high strength can be kept at high temperature environment by, arranging reinforcing substance at boundaries of crystal grains when manufacturing metal members by metal powder injection molding.
  • the elongation of metal members can be prevented to become smaller by keeping a concentration of reinforcing substance equal to or lower than a certain value.
  • a manufacturing method 1 of forming a metal member with a high strength at a high temperature environment by metal powder injection molding will be explained.
  • the manufacturing method 1 manufactures a metal member in which reinforce substance is arranged at boundaries of crystal grains even by using metal powder injection molding.
  • a powder manufacturing step of manufacturing metal powder and reinforcing powder is performed.
  • the method of manufacturing the metal powder includes a method of melting the metal once and then manufacturing, a method of mechanically pulverizing and then manufacturing, a method of chemically manufacturing and the like, and any method can be chosen.
  • a method of melting once and then manufacturing there is an atomization method.
  • the atomization method is a method of manufacturing a powder by blowing a gas to the molten metal which flows out.
  • a maximal grain size of this metal powder is, for example, 20 ⁇ m (micrometer).
  • This metal powder is, for example, a fine powder classified by openings of sieve net compliant to standard of JIS Z8801 or ASTM E11.
  • grain size distribution may be measured by a laser diffraction-scattering method compliant to JIS Z8825-1 standard.
  • fine powder classified by airstream classification may be used.
  • the strength of the metal member to be manufactured is ensured.
  • 0.12 mass % of carbon is added related to the entire metal to be molten.
  • mass of carbon to add is adjusted in accordance with a mass of the reinforcing powder to mix.
  • the carbon to add is of an amount larger than 5 mass % and smaller than 90 mass % related to carbon concentration of the metal member to manufacture.
  • a mass of the carbon to add is preferably larger than 0.01 mass % and smaller than 0.18 mass % related to the entire metal to melt.
  • an amount of carbon to add is 0.01 mass % related to the entire metal to melt.
  • any metal such as nickel based alloy, cobalt based alloy, titanium alloy, tungsten alloy, stainless steel, tool steel, aluminum alloy, copper alloy and the like can be used as the metal.
  • the reinforcing powder which includes reinforcing substance including a plurality of type of substances such as carbon, nitrogen and the like, is similarly manufactured as well.
  • the reinforcing powder is titanium carbide powder, silicon carbide powder, titanium nitride powder, silicon dioxide powder or the like.
  • a maximal grain size of the reinforcing powder is preferably smaller than 1 ⁇ 5 of a maximal grain size of the metal powder.
  • the maximal grain size of the reinforcing powder is preferably smaller than 1/7 of the maximal grain size of the metal powder.
  • the maximal grain size of the reinforcing powder is preferably larger than 1/100 of the maximal grain size of the metal powder.
  • the maximal grain size of the metal powder is 20 ⁇ m
  • the maximal grain size of the reinforcing metal is 3 ⁇ m.
  • Reinforcing powder is, for example, fine powder classified by a sieve net.
  • grain size distribution may be measured by the laser diffraction-scattering method compliant to JIS Z8825-1 standard.
  • fine powder which results of reinforcing powder classified by airstream classification may be used.
  • a mixing step of mixing the metal powder, the reinforcing powder and a binder is performed.
  • a mixing drum or the like is used to mix the metal powder and the reinforcing powder, both in powder state when mixing.
  • An amount of the reinforcing powder to mix is preferably larger than 1 part of mass and smaller than 50 parts of mass related to 1000 parts of mass of the metal powder. Additives may be mixed as needed.
  • the binder for example, a mixture of one or more types in each of organic compounds, such as paraffin wax, carnauba wax, fatty acid ester and the like, and thermoplastic resins with relatively low melting point, such as polyethylene (PE), polypropylene (PP), ethylene vinyl acetate (EVA) copolymer and the like, can be used.
  • the metal powder and the binder may be mixed when manufacturing the powder in the step S 10 .
  • the binder is kneaded in a molten state together with the molten metal to be granulated into metal powder which is then used.
  • step S 30 an injection molding step of molding an injection molded body by injection molding of the mixed powder.
  • the mixed powder is provided to an injection molding apparatus.
  • the provided powder is heated and molten, then pumped into a metal mold to be injection molded. Later, the metal mold is cooled down and opened to take the injection molded body therefrom.
  • a degreasing step of degreasing the injection molded body that has been taken out and removing the binder from the injection molded body is performed.
  • the injection molded body is heated to 500° C. to remove the binder therefrom.
  • an intermediate molded body, from which the binder is removed is formed.
  • various methods can be used, such as degreasing by irradiating a light beam, degreasing by immersing in a solvent such as water or organic solvent, or the like, in accordance with characteristics of the binder.
  • step S 50 an incinerating step of incinerating the intermediate molded body from which the binder has been removed to form an incinerated body is performed.
  • bonding of metal powder is grown by heating in vacuum or inert gas.
  • Incineration temperature is, for example, 1200° C. or more and 1300° C. or less.
  • a pressurizing step of pressurizing the incinerated body to remove voids in the incinerated body is performed.
  • a metal member with an incinerated density of 90% or more and 100% or less is molded.
  • the incinerated density may be 95% or more.
  • the incinerated density may be 97% or less.
  • a metal member with a reinforcing substance arranged at boundaries of crystal grains can be manufactured.
  • a nickel based alloy member has been manufactured by the manufacturing method 1 .
  • a nickel based alloy powder has been prepared.
  • This nickel based alloy powder has a maximal grain size of 20 ⁇ m and a carbon concentration of 0.01 mass %.
  • This carbon concentration is a value in accordance with an amount of reinforcing powder to be mixed, because the carbon concentration of the metal member after manufacturing is controlled to 0.2 mass %.
  • a titanium carbide powder has been prepared as reinforcing powder.
  • the maximal grain size of this titanium carbide powder is 3 ⁇ m.
  • An amount of the titanium carbide is 0.66 mass % related to the nickel based alloy powder.
  • carbon concentration of manufactured metal member has been 0.22 mass %.
  • the titanium carbide of the reinforcing powder is formed in granular state so as to surround crystal grains of the nickel based alloy. This is a characteristic obtained by mixing reinforcing powder to a powder for injection molding.
  • no reinforcing substance is precipitated at boundaries of crystal grains of an injection molded metal member in general.
  • the titanium carbide precipitated at boundaries of those crystal grains is greater than the maximal grain size of the reinforcing powder. It is understood by this as well that the titanium carbide at boundaries of crystal grains results of the mixed reinforcing powder which has melted and precipitated. That is, the grain area equivalent grain size of the reinforcing substance precipitated at boundaries of crystal grains is larger than 1/100 of the grain area equivalent grain size of crystal grains.
  • the reinforcing powder includes a one with a size smaller than 1 ⁇ 5 of the grain area equivalent grain size of the crystal grains.
  • the reinforcing powder includes a one with a size smaller than 1 ⁇ 8 of the grain area equivalent grain size of the crystal grains.
  • most of titanium carbide have a shape so that a value of a length, in a direction in which the length thereof is the longest, divided by a length of a longest part in a direction orthogonal to this direction, is smaller than 5.
  • 90% or more of granular titanium carbide has a shape in which this value is smaller than 5. Further, this value may be smaller than 3.
  • reinforcing substance 230 is precipitated along boundaries of crystal grains 10 .
  • reinforcing substance inside crystal grains 10 precipitates at boundaries of crystal grains.
  • the reinforcing substance 230 precipitating at boundaries of the crystal grains 10 precipitates along the boundaries.
  • most of the reinforcing substance 230 precipitated at boundaries have a shape so that a value of a length in a direction in which the length thereof is the longest, divided by a length of a longest part in a direction orthogonal to this direction, is greater than 5.
  • the manufacturing method 1 manufactures by injection molding. For this reason, it is understood that the entire grain is not molten and that titanium carbide of reinforcing substance is distributed inside the crystal grains too.
  • the reinforcing substance 30 is formed in granular state so as to surround crystal grains 10 .
  • the reinforcing substance 20 is included inside crystal grains 10 too.
  • FIGS. 12 to 14 reinforcing substance is hardly verified inside crystal grains of metal members manufactured by casting.
  • metal members manufactured by the manufacturing method 1 has a structure different from ones manufactured by conventional metal powder injection molding, casting or the like.
  • tensile strengths and elongations will be compared between a metal member manufactured by the manufacturing method 1 and a metal member manufactured by a general metal powder injection molding.
  • a metal member C has been manufactured by use of metal powder of nickel based alloy with a carbon concentration of 0.12 mass %, by metal powder injection molding. A maximal grain size of this powder is 20 ⁇ m.
  • the carbon concentration of the manufactured metal member was 0.20 mass %. That is, the carbon concentration is of a same level than the one of the metal member manufactured by manufacturing method 1 .
  • the tensile strength of this metal member C was approximatively 585 MPa.
  • the tensile strength of the metal member manufactured by the manufacturing method 1 was approximatively 620 MPa, which is a higher strength compared to the metal member C.
  • the one of the metal member C is approximatively 2%
  • the one of the metal member by the manufacturing method 1 is approximatively 6% which is larger. That is, it is understood that the tensile strength and the elongation of a metal member manufactured by the manufacturing method 1 are higher than ones of metal member having a carbon concentration of a same level.
  • the elongation of the metal member A is approximatively 5%.
  • the elongation of the metal member by the manufacturing method 1 is approximatively 6%: although the carbon concentration thereof after manufacturing is higher, this is larger than the elongation of the metal member A. That is, the metal member manufactured by the manufacturing method 1 has both larger tensile strength and larger elongation.
  • the metal member manufactured by the manufacturing method 1 has an advantageous effect on both tensile strength and elongation compared to a metal member manufactured by conventional metal powder injection molding.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
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JP2017-085858 2017-04-25
JP2017085858A JP6774369B2 (ja) 2017-04-25 2017-04-25 金属部材及びその製造方法
PCT/JP2018/000273 WO2018198440A1 (ja) 2017-04-25 2018-01-10 金属部材及びその製造方法

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JP3358775B2 (ja) * 1994-08-09 2002-12-24 株式会社豊田中央研究所 複合材料およびその製造方法
WO2005072954A1 (en) * 2004-01-29 2005-08-11 The Nanosteel Company Wear resistant materials
JP2005350710A (ja) 2004-06-09 2005-12-22 Daido Steel Co Ltd 金属粉末射出成形用耐熱合金
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CA3057264A1 (en) 2018-11-01
JP2018184627A (ja) 2018-11-22
EP3616808A4 (de) 2020-12-30
JP6774369B2 (ja) 2020-10-21
WO2018198440A1 (ja) 2018-11-01

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