US3740215A - Method for producing a hot worked body - Google Patents
Method for producing a hot worked body Download PDFInfo
- Publication number
- US3740215A US3740215A US00066641A US3740215DA US3740215A US 3740215 A US3740215 A US 3740215A US 00066641 A US00066641 A US 00066641A US 3740215D A US3740215D A US 3740215DA US 3740215 A US3740215 A US 3740215A
- Authority
- US
- United States
- Prior art keywords
- hot
- producing
- heating
- hot worked
- powder
- 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 - Lifetime
Links
Classifications
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/1208—Containers or coating used therefor
- B22F3/1258—Container manufacturing
- B22F3/1266—Container manufacturing by coating or sealing the surface of the preformed article, e.g. by melting
-
- 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
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12014—All metal or with adjacent metals having metal particles
- Y10T428/12021—All metal or with adjacent metals having metal particles having composition or density gradient or differential porosity
Definitions
- the step of sealing the surface was found to substantially i g l g gi %g? to Allegheny Ludlum Industries preclude internal oxidation during both heating and hot N0 'Drawiug. I iled Aug. 24, 1970, Ser. No. 66,641 o king. It provides a dense surface on the body which Int. CL zz 7/00 will resist the penetration of harmful gases at elevated U,s CL 75 20g 7 Claims temperatures. In addition, it is advantageous as it rapidly 10 provides a dense surface which is of the same material as the interior, and thus allows the body to be handled in ABSTRACT OF THE DISCLOSURE the same manner as a solid bar.
- a method for producing a hot worked body having a Self-sealing has been disclosed in the past for various low incidence of oxide inclusions. It comprises the steps reasons, e.g., to improve mechanical strength or to give of consolidating powder comprised of metallic particles direction to gas flo Within a Y- into a porous body, substantially sealing the surface of 709, 3,183,086, and 3,231,430, which respectively issued said body by closing surface pores, heating said body, and on Nov. 6, 1956, May 11, 1965, and Jan. 25, 1966, dishot working said body. close self-sealing.
- the present invention relates to a method of producing stretched during hot working a hot Worked y having a low incidence of Oxide It is accordingly an object of this invention to provide a clusions and more Particularly t0 9 method of Producing method for producing a hot worked body having a low a hot Worked y having a 10W lhcldenoe of oxide incidence of oxide inclusions from powder comprised of clusions from powder comprised of metallic particles.
- the method of the present invention comprises the steps and are more easily designed and fabricated than the bflst of consolidating powder comprised of metallic particles materials available y a few years y can now be into a porous body, substantially sealing the surface of fashioned into Smaller Parts, large! p and more said body by closing surface pores, heating said body, P Shapes than ever before- Largely responsible and hot working said body. Consolidating can involve a creating this advancement in materials technology are cold pressing, hot pressing, or intering operation 01- a modern powder metallurgy processes.
- Hot working can involve any of the known methods Various methods have been attempted to preclude inwhich include extrusion, rolling, swaging, drawing, and ternal oxidation during hot working and heating for hot forging. It can be performed in air or other oxygen conworking.
- One method involved canning of a consolidated t aining atmospheres. powder body under vacuum and hot working of the The powder which is to form the hot worked composite canned assembly. This process provided adequate proteccan be chosen from a Wide spectrum of metals, mixtures tion from oxidation but added extra costs to the hot workof metals, and mixtures of metals and non-metals.
- pretrative metals are stainless steel, tool steel, copper, and paring the can and subsequently removing it.
- a canning bronze Illustrative mixtures are copper-carbon and procedure is disclosed in US. Pat. No. 2,932,882 which graphite-bronze. issued on Apr. 19, 1960.
- a second method involved The following examples are illustrative of the invention. heating in a non-oxidizing atmosphere.
- the present invention provides a method for producing a hot worked body having a low incidence of oxide ininches in diameter by 9 inches long, hydrostatically consolidated at pressures of 20, 25, and 30,000 p.s.i. and vacuum sintered for six hours at 2400 F.
- the bodies were about 2.75 inches in diameter and about 7 inches long.
- the bodies were prepared for extrusion by drilling a inch hole through their centers and by machining the outer diameters to 2.62 inches. Both the inner and outer diameters as well as the ends and corners were then burnished. The burnished outer diameter was 2.60 inches. Extrusion was subsequently carried out with the bodies at a temperature of from 2000 to 2200 F. The bodies were heated in air with an induction heating coil.
- the extruded bodies were examined metallographically for the presence of internal oxidation. The examination revealed that internal oxidation was not present. Burnishing provided a dense surface on the bodies which resisted the penetration of harmful gases during heating and hot working and, thereby, precluded internal oxidation.
- a method of producing a hot worked body having a low incidence of oxide inclusions from powder comprised of metallic particles which comprises the steps of: consolidating powder comprised of metallic particles into a porous body; substantially sealing the surface of said body by closing surface pores; heating said body in an oxidizing atmosphere; and hot working said body in an oxidizing atmosphere, said sealing of said surface substantially precluding internal oxidation during said heating and said hot working by providing a dense surface which resists the penetration of harmful gas at elevated temperatures.
- a method according to claim 1 wherein said powder is consolidated by cold pressing powder and sintering said pressed powder in a non-oxidizing atmosphere and wherein said body is hot worked by extruding said body.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US6664170A | 1970-08-24 | 1970-08-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3740215A true US3740215A (en) | 1973-06-19 |
Family
ID=22070767
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00066641A Expired - Lifetime US3740215A (en) | 1970-08-24 | 1970-08-24 | Method for producing a hot worked body |
Country Status (1)
Country | Link |
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US (1) | US3740215A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5132606U (en) * | 1975-04-16 | 1976-03-10 | ||
US4067096A (en) * | 1975-11-12 | 1978-01-10 | Whalen Jr Mark E | Method for making a reconstituted metal strand |
US4076520A (en) * | 1975-06-05 | 1978-02-28 | Midrex Corporation | Method for continuous passivation of sponge iron material |
US4093455A (en) * | 1975-06-05 | 1978-06-06 | Midrex Corporation | Compacted, passivated metallized iron product |
US4104782A (en) * | 1976-07-14 | 1978-08-08 | Howmet Turbine Components Corporation | Method for consolidating precision shapes |
US4460541A (en) * | 1980-01-16 | 1984-07-17 | Reynolds Metals Company | Aluminum powder metallurgy |
US4587096A (en) * | 1985-05-23 | 1986-05-06 | Inco Alloys International, Inc. | Canless method for hot working gas atomized powders |
EP0219231A1 (en) * | 1985-09-26 | 1987-04-22 | Nippon Kokan Kabushiki Kaisha | Method of sintering compacts |
EP0388968A2 (en) * | 1989-03-24 | 1990-09-26 | Nippon Steel Corporation | Method of producing clad metals |
US6355088B1 (en) | 1997-08-04 | 2002-03-12 | Bechtel Corporation | Method for direct reduction and upgrading of fine-grained refractory and earthy iron ores and slags |
US20170051462A1 (en) * | 2013-03-15 | 2017-02-23 | Oshkosh Corporation | Snow removal truck broom systems and methods |
-
1970
- 1970-08-24 US US00066641A patent/US3740215A/en not_active Expired - Lifetime
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5132606U (en) * | 1975-04-16 | 1976-03-10 | ||
US4076520A (en) * | 1975-06-05 | 1978-02-28 | Midrex Corporation | Method for continuous passivation of sponge iron material |
US4093455A (en) * | 1975-06-05 | 1978-06-06 | Midrex Corporation | Compacted, passivated metallized iron product |
US4067096A (en) * | 1975-11-12 | 1978-01-10 | Whalen Jr Mark E | Method for making a reconstituted metal strand |
US4104782A (en) * | 1976-07-14 | 1978-08-08 | Howmet Turbine Components Corporation | Method for consolidating precision shapes |
US4460541A (en) * | 1980-01-16 | 1984-07-17 | Reynolds Metals Company | Aluminum powder metallurgy |
US4587096A (en) * | 1985-05-23 | 1986-05-06 | Inco Alloys International, Inc. | Canless method for hot working gas atomized powders |
EP0219231A1 (en) * | 1985-09-26 | 1987-04-22 | Nippon Kokan Kabushiki Kaisha | Method of sintering compacts |
EP0388968A2 (en) * | 1989-03-24 | 1990-09-26 | Nippon Steel Corporation | Method of producing clad metals |
EP0388968A3 (en) * | 1989-03-24 | 1991-01-02 | Nippon Steel Corporation | Method of producing clad metals |
US6355088B1 (en) | 1997-08-04 | 2002-03-12 | Bechtel Corporation | Method for direct reduction and upgrading of fine-grained refractory and earthy iron ores and slags |
US20170051462A1 (en) * | 2013-03-15 | 2017-02-23 | Oshkosh Corporation | Snow removal truck broom systems and methods |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ALLEGHENY LUDLUM CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:ALLEGHENY LUDLUM STEEL CORPORATION;REEL/FRAME:004779/0642 Effective date: 19860805 |
|
AS | Assignment |
Owner name: PITTSBURGH NATIONAL BANK Free format text: SECURITY INTEREST;ASSIGNOR:ALLEGHENY LUDLUM CORPORATION;REEL/FRAME:004855/0400 Effective date: 19861226 |
|
AS | Assignment |
Owner name: PITTSBURGH NATIONAL BANK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. RECORDED ON REEL 4855 FRAME 0400;ASSIGNOR:PITTSBURGH NATIONAL BANK;REEL/FRAME:005018/0050 Effective date: 19881129 |