Andrzej L Wojcieszynski

US Patent:

7288157, Oct 30, 2007

Filed:

Nov 13, 2006

Appl. No.:

11/598082

Inventors:

Alojz Kajinic - Carnegie PA, US
Andrzej L. Wojcieszynski - Pittsburgh PA, US
Maria K. Sawford - Coraopolis PA, US

Assignee:

Crucible Materials Corp. - Syracuse NY

International Classification:

C22C 38/00
C22C 5/10

US Classification:

148325, 420 12

Abstract:

A powder metallurgy corrosion and wear resistant tool steel article, and alloy thereof. The article is manufactured by hot isostatic compaction of nitrogen atomized, prealloyed high-chromium, high-vanadium, high-niobium powder particles. The alloy is characterized by very high wear and corrosion resistance, making it particularly useful for use in the manufacture of components for advanced bearing designs as well as machinery parts exposed to severe abrasive wear and corrosion conditions, as encountered, for example, in the plastic injection molding industry and food industry.

US Patent:

7615123, Nov 10, 2009

Filed:

Sep 29, 2006

Appl. No.:

11/529237

Inventors:

Alojz Kajinic - Carnegie PA, US
Andrzej L. Wojcieszynski - Pittsburgh PA, US

Assignee:

Crucible Materials Corporation - Syracuse NY

International Classification:

C21D 5/00

US Classification:

148321, 420101, 420102

Abstract:

A powder metallurgy cold-work tool steel article of hot isostatic compacted nitrogen atomized, prealloyed powder. The alloy of the article includes the addition of niobium, which combined with the use of gas atomization, results in a fine carbide size distribution. This in turn results in improved bend fracture strength and impact toughness. In addition, as a result of isostatic compaction of nitrogen gas atomized prealloyed powder a fine distribution of carbides results to obtain a microstructure that achieves both improved toughness and wear resistance.

US Patent:

7651575, Jan 26, 2010

Filed:

Jun 27, 2007

Appl. No.:

11/769065

Inventors:

Maria K. Sawford - Corapolis PA, US
Shubhayu Sinharoy - Philadelphia PA, US
Sundaram L. Narasimhan - Marshall MI, US
Alojz Kajinic - Carnegie PA, US
Andrzej L. Wojcieszynski - Pittsburgh PA, US
Jeryl K. Wright - Camillus NY, US

Assignee:

Eaton Corporation - Cleveland OH

International Classification:

C22C 19/07
C22C 38/44
C22C 30/00
C22C 38/08

US Classification:

148410, 420 53, 420 54, 4205861

Abstract:

An Fe—Ni-based alloy that has improved wear resistance at high temperature over Ni-based superalloys is provided. The alloy is particularly useful for manufacturing engine exhaust valves and other high temperature engine components subjected to corrosion, wear and oxidation.

US Patent:

7799271, Sep 21, 2010

Filed:

May 23, 2007

Appl. No.:

11/752584

Inventors:

Andrzej L. Wojcieszynski - Pittsburgh PA, US

Assignee:

Compaction & Research Acquisition LLC - Pittsburg PA

International Classification:

C22C 19/05

US Classification:

420448, 148428

Abstract:

Nickel base alloys for use in applications for highly corrosive and abrasive environments. The alloys contain a large volume fraction of metallic carbide particles that provide wear and abrasion resistance. The alloys are produced by induction melting and gas atomization to form alloy powder particles. The particles are consolidated by hot isostatic pressing to form a solid article.

US Patent:

20060249230, Nov 9, 2006

Filed:

May 9, 2005

Appl. No.:

11/124350

Inventors:

Alojz Kajinic - Carnegie PA, US
Andrzej Wojcieszynski - Pittsburgh PA, US
Maria Sawford - Coraopolis PA, US

International Classification:

C22C 38/36
C22C 38/18

US Classification:

148325000, 420012000

Abstract:

A powder metallurgy corrosion and wear resistant tool steel article, and alloy thereof. The article is manufactured by hot isostatic compaction of nitrogen atomized, prealloyed high-chromium, high-vanadium, high-niobium powder particles. The alloy is characterized by very high wear and corrosion resistance, making it particularly useful for use in the manufacture of components for advanced bearing designs as well as machinery parts exposed to severe abrasive wear and corrosion conditions, as encountered, for example, in the plastic injection molding industry and food industry.

US Patent:

20070053784, Mar 8, 2007

Filed:

Sep 6, 2005

Appl. No.:

11/218618

Inventors:

Joseph Muha - Pittsburgh PA, US
Andrzej Wojcieszynski - Pittsburgh PA, US
Brian McTiernan - Sewickley PA, US

International Classification:

C22C 38/52

US Classification:

419029000, 419066000, 420107000

Abstract:

A fully dense, powder-metallurgy produced maraging steel alloy article of prealloyed powder for use as a tool for high temperature applications. The article in the as-produced condition having a hardness less than 40 HRC to provide machinability and thereafter the article upon maraging heat treatment having a hardness greater than 45 HRC. A method for producing this article comprises compacting prealloyed powder to produce a fully dense article having a hardness less than 40 HRC and thereafter maraging heat treating to a hardness greater than 45 HRC.

US Patent:

20120230859, Sep 13, 2012

Filed:

Feb 23, 2012

Appl. No.:

13/403368

Inventors:

Joseph F. MUHA - Pittsburgh PA, US
Andrzej L. WOJCIESZYNSKI - Pittsburgh PA, US
Brian J. MCTIERNAN - Sewickley PA, US

International Classification:

B32B 15/00
B22F 3/15
C22C 38/44
B22F 3/26

US Classification:

419 27, 419 29, 148335

Abstract:

A fully dense, powder-metallurgy produced maraging steel alloy article of prealloyed powder for use as a tool for high temperature applications. The article in the as-produced condition having a hardness less than 40 HRC to provide machinability and thereafter the article upon maraging heat treatment having a hardness greater than 45 HRC. A method for producing this article comprises compacting prealloyed powder to produce a fully dense article having a hardness less than 40 HRC and thereafter maraging heat treating to a hardness greater than 45 HRC.

US Patent:

60570458, May 2, 2000

Filed:

Oct 14, 1997

Appl. No.:

8/949497

Inventors:

Andrzej L. Wojcieszynski - Pittsburgh PA
William Stasko - West Homestead PA

Assignee:

Crucible Materials Corporation - Syracuse NY

International Classification:

C22C 2902
C22C 3800

US Classification:

428546

Abstract:

A powder-metallurgy produced high-speed steel article having a combination of high hardness and wear resistance, particularly at elevated temperatures. This combination of properties is achieved by the combination of W, Mo, V, and Co. The article is particularly suitable for use in the manufacture of gear cutting tools, such as hobs, and surface coatings.