Mark D Rhoads

US Patent:

6692550, Feb 17, 2004

Filed:

Mar 28, 2002

Appl. No.:

10/109995

Inventors:

Edward Lee Raymond - Maineville OH
Mark Alan Rhoads - Cincinnati OH
Glenn Charles Culbertson - Mason OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

C21C 706

US Classification:

75508, 164 571, 164568

Abstract:

A steel article is fabricated by providing an iron-base alloy having less than about 0. 5 weight percent aluminum, melting the alloy to form a melt, adding calcium to the melt, thereafter adding aluminum to the melt to increase the aluminum content of the melt to more than about 0. 5 weight percent aluminum, and casting the melt to form a casting. Other calcium additions may be made simultaneously with the adding of aluminum, and after the adding of aluminum but before casting the melt. The calcium additions deoxidize the melt to minimize the formation of clustered aluminum-oxygen-based inclusions.

US Patent:

6966954, Nov 22, 2005

Filed:

Oct 24, 2002

Appl. No.:

10/279488

Inventors:

Mark Alan Rhoads - Cincinnati OH, US
Michael Gilbert Johnson - Fairfield OH, US
Jonothan Allen Scheetz - Waynesville OH, US

Assignee:

General Electric Comany - Schenectady NY

International Classification:

C22C038/22
C22C038/44
C21D009/00
C23C008/26

US Classification:

148319, 148230, 148231, 148208

Abstract:

A roller bearing that provides ball and roller bearing elements comprised of M50 steel and M50NiL steel having surface hardnesses above 60 HRC, and in the range of 65-72 HRC. The hardness in the surface region is achieved by nitriding the surface to achieve a high hardness and extended life. This improvement is brought about by controlling the microstructure of the alloy by minimizing the formation of retained austenite. The material is tempered as required. The surface is then nitrided, but the nitriding operation is carefully controlled to avoid the formation of intergranular nitrides. Because of the method used to prevent the formation of intergranular nitrides, some carbon may be present to prevent the surface of the steel from becoming depleted of carbon. The hardening element in this nitro-carburizing operation is nitrogen, which forms iron nitride as FeN or FeN intragranularly. The purpose of the carbon in the operation is to maintain the concentration of carbon in the surface of the bearing so that the properties are not altered by decarburizing the surface.

US Patent:

7094273, Aug 22, 2006

Filed:

Feb 6, 2004

Appl. No.:

10/773362

Inventors:

Edward Lee Raymond - Maineville OH, US
Mark Alan Rhoads - Cincinnati OH, US
Glenn Charles Culbertson - Mason OH, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

C21C 7/06

US Classification:

75508, 164 571

Abstract:

A steel article is fabricated by providing an iron-base alloy having less than about 0. 5 weight percent aluminum, melting the alloy to form a melt, adding calcium to the melt, thereafter adding aluminum to the melt to increase the aluminum content of the melt to more than about 0. 5 weight percent aluminum, and casting the melt to form a casting. Other calcium additions may be made simultaneously with the adding of aluminum, and after the adding of aluminum but before casting the melt. The calcium additions deoxidize the melt to minimize the formation of clustered aluminum-oxygen-based inclusions.

US Patent:

20110159175, Jun 30, 2011

Filed:

Dec 30, 2009

Appl. No.:

12/649737

Inventors:

Jon Raymond GROH - Loveland OH, US
Thomas Allen Kauffung - West Chester OH, US
Mark Alan Rhoads - Cincinnati OH, US

International Classification:

B05D 1/36
B05D 1/02
B05D 5/00
B05D 1/18
B05D 1/28

US Classification:

427142, 427402, 427405, 427247, 4274191, 4274192

Abstract:

Disclosed herein is a method for inhibiting corrosion of a high strength steel turbine component subject to rotary stress. The method comprises applying a sacrificial overlay coating material to at least a portion of a surface of the component to form a protected component, and applying a seal material to at least a portion of the protected component to form a seal coat having a temperature resistance of greater than about 500 F. Also disclosed herein is a turbine component and corresponding engine protected by the method. Further provided is a method for repairing a high strength steel component of a turbofan engine. These methods are capable of inhibiting at least one of stress corrosion cracking or surface pitting of the turbine component after exposure to corrosive water.

US Patent:

51004836, Mar 31, 1992

Filed:

Apr 24, 1991

Appl. No.:

7/690208

Inventors:

Mark A. Rhoads - Cincinnati OH

Assignee:

Cincinnati Milacron Inc. - Cincinnati OH

International Classification:

C21D 148

US Classification:

148 165

Abstract:

A method of case hardening ferrometallic parts that avoids the use of protective coatings or shields is provided. The process comprises the steps of a) carburizing the entire part, b) machining the carburized part to form first and second surface regions wherein the second surface region has a carbon content at least 100% greater than the carbon content of the first surface region, c) heating the machined part at a hardening temperature with the entire part in contact with a gaseous atmosphere containing a source of carbon and a carbon content of from 85% to 115% of the carbon content of said first surface region, and d) quenching the part.

US Patent:

55188206, May 21, 1996

Filed:

Jun 16, 1992

Appl. No.:

7/899562

Inventors:

Benjamin L. Averbach - late of Belmont MA
Jon C. Schaeffer - Milford OH
Mark A. Rhoads - Cincinnati OH
Joseph A. Heaney - Forest VA

Assignee:

General Electric Company - Cincinnati OH

International Classification:

B32B 1504
F16C 3300

US Classification:

428469

Abstract:

A bearing includes a bearing component, such as a bearing race, having a bearing contact surface. A region at the bearing contact surface is made of titanium aluminide, preferably an alpha-2 or gamma titanium aluminide. A case-hardened layer present at the surface of the titanium aluminide region increases the hardness and wear resistance of the titanium aluminide at elevated temperature. The case-hardened layer is preferably formed by diffusing carbon into the surface of the titanium aluminide from a gaseous medium, at elevated temperature land at ambient or reduced pressure.

US Patent:

53934881, Feb 28, 1995

Filed:

Aug 6, 1993

Appl. No.:

8/102923

Inventors:

Mark A. Rhoads - Cincinnati OH
Edward L. Raymond - Maineville OH
Warren M. Garrison - Pittsburgh PA

Assignee:

General Electric Company - Cincinnati OH

International Classification:

C22C 3852

US Classification:

420 95

Abstract:

A duplex strengthened structural steel that is particularly suitable for demanding applications which require both high yield strength and fatigue properties is provided. The preferred steel alloys of this invention are characterized by both the presence of intermetallic strengthening precipitates like maraging steels, as well as alloy carbide strengtheners as is common with secondary hardening steels. Titanium is substantially absent from the preferred steel alloys of this invention. Thus the formation of nonmetallic inclusions, such as titanium carbonitrides, are alleviated which correspondingly enhances the fatigue properties of the preferred alloys. To compensate for the lack of titanium strengthening precipitates within the alloy, additions of aluminum are provided such that the aluminum forms intermetallic strengthening precipitates with nickel.

US Patent:

20230066145, Mar 2, 2023

Filed:

Aug 24, 2021

Appl. No.:

17/410512

Inventors:

- Schenectady NY, US
Mark Alan Rhoads - Cincinnati OH, US

International Classification:

B22F 9/18
B22F 1/00

Abstract:

Methods for reducing a concentration of hexavalent chromium within a first aluminum slurry by adding a reducing agent to form a second aluminum slurry are provided. The reducing agent causes a chemical reduction reaction with the hexavalent chromium compound of the first aluminum slurry to form a trivalent chromium compound within the second aluminum slurry such that a first weight ratio of hexavalent chromium to trivalent chromium in the first aluminum slurry is decreased to a second weight ratio of hexavalent chromium to trivalent chromium in the second aluminum slurry, with the second weight ratio being less than the first weight ratio.