Ling O Yang

US Patent:

6405601, Jun 18, 2002

Filed:

Dec 22, 2000

Appl. No.:

09/742446

Inventors:

Ling Yang - Clifton Park NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

G01N 1908

US Classification:

73799

Abstract:

A method to estimate the crack growth rate of HIPed cast IN718 material with various grain sizes and working environments comprising determining the average grain size diameter and duration of hold time and solving the following equation, whereby N is the number of operating cycles, a is the crack length, da/dN is crack growth rate GS is the average grain size in meters, HT is hold time in seconds, Env is 1 for an air environment, and Env is -1 if a steam environment. The estimates obtained from the transfer function can be used for designing of and predicting the life of cast IN718 components such as manifolds.

US Patent:

6409853, Jun 25, 2002

Filed:

Oct 25, 1999

Appl. No.:

09/426306

Inventors:

Samuel V. Thamboo - Latham NY
Ling Yang - Niskayuna NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

C22F 110

US Classification:

148677, 148410, 148428, 148676

Abstract:

A process for forging large components of Alloy 718 material so that the components do not exhibit abnormal grain growth includes the steps of: a) providing a billet with an average grain size between ASTM 0 and ASTM 3; b) heating the billet to a temperature of between 1750Â F. and 1800Â F. ; c) upsetting the billet to obtain a component part with a minimum strain of 0. 125 in at least selected areas of the part; d) reheating the component part to a temperature between 1750Â F. and 1800Â F. ; e) upsetting the component part to a final configuration such that said selected areas receive no strains between 0. 01 and 0. 125; f) solution treating the component part at a temperature of between 1725Â F. and 1750Â F. ; and g) aging the component part over predetermined times at different temperatures.

US Patent:

6512982, Jan 28, 2003

Filed:

Dec 20, 2000

Appl. No.:

09/742667

Inventors:

Ling Yang - Clifton Park NY
Robert Falsetti - Schenectady NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

G01N 3120

US Classification:

702 34, 702 36, 700 30, 707102

Abstract:

A method and system for evaluating structural defects in metals is provided. In one embodiment, the method recognizes that the acceptability of a given defect is principally determined by the four basic parameters of operating temperature, operating stress, defect area, and defect shape. Ranges are established for each of these four basic parameters, and intermediate values within these ranges are selected to create a series of index value data sets. The method evaluates these index value data sets by calculating a life cycles estimate for each. Using statistical methods, the life cycles results are analyzed to determine the effect each of the four basic parameters has on the life of a component with a defect. Understanding the relationship between these four basic parameters and life cycles enables the method to provide an interpolation algorithm for finding the life cycles for any component having a defect.

US Patent:

6539810, Apr 1, 2003

Filed:

Dec 22, 2000

Appl. No.:

09/742444

Inventors:

Ling Yang - Clifton Park NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

G01N 308

US Classification:

73826, 73760, 73789

Abstract:

A method to estimate the tensile properties of HIPed cast IN718 components at various grain sizes and different operating temperatures by using transfer functions to estimate ultimate tensile strength, yield strength, and elongation.

US Patent:

6962483, Nov 8, 2005

Filed:

Dec 4, 2003

Appl. No.:

10/707308

Inventors:

Swami Ganesh - Clifton Park NY, US
Robin Carl Schwant - Pattersonville NY, US
Peter William Schilke - Brewster MA, US
Ling Yang - Niskayuna NY, US
John Zhiqiang Wang - Greenville SC, US
Robert B. Falsetti - Schenectady NY, US
Francis Alexander Reed - Princetown NY, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

F01D025/00

US Classification:

415200, 4152161

Abstract:

A monolithic rotor comprising first and second rotor regions axially aligned within the monolithic rotor and a transition zone therebetween. The first and second rotor regions are formed of different alloys and the transition zone having a composition that differs from and varies between the first and second rotor regions. The first rotor region is located within a high pressure region of the monolithic rotor and is formed from an alloy chosen from the group consisting of CrMoV low alloy steels, martensitic stainless steels containing about 11 to about 14 weight percent chromium, Fe—Ni alloys, and nickel-base alloys. The second rotor region is located within a low pressure region of the monolithic rotor and is formed from an alloy chosen from the group consisting of NiCrMoV low alloy steels and martensitic stainless steels containing about 11 to about 14 weight percent chromium.

US Patent:

6971850, Dec 6, 2005

Filed:

Dec 4, 2003

Appl. No.:

10/707306

Inventors:

Swami Ganesh - Clifton Park NY, US
Robin Carl Schwant - Pattersonville NY, US
Ling Yang - Niskayuna NY, US
John Zhiqiang Wang - Greenville SC, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

F01D005/06

US Classification:

4152161

Abstract:

A process for producing a rotor, the rotor formed thereby, as well as turbines in which such a rotor is installed. The rotor is formed by casting an ingot to have first and second regions formed of different alloys that intermix during casting to define a transition zone therebetween. The ingot is forged to yield a rotor forging that contains axially-aligned first and second alloy regions and a transition zone therebetween. The effects of the transition zone can be mitigated by modeling the transition zone and then off-center machining the forging so that the axis of rotation of the machined monolithic rotor is more centrally located with respect to the transition zone.

US Patent:

7065872, Jun 27, 2006

Filed:

Dec 4, 2003

Appl. No.:

10/707302

Inventors:

Swami Ganesh - Clifton Park NY, US
Robin Carl Schwant - Pattersonville NY, US
Ling Yang - Niskayuna NY, US
John Zhiqiang Wang - Greenville SC, US
Francis Alexander Reed - Scotia NY, US
Robert V. Falsetti - Schenectady NY, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

B23P 6/00

US Classification:

2988912, 2988971, 2940705

Abstract:

A method of processing a rotor. The rotor is formed by casting an ingot to have first and second regions formed of different alloys that intermix during casting to define a transition zone therebetween. The ingot is forged to yield a rotor forging that contains axially-aligned first and second alloy regions and a transition zone therebetween. A three-dimensional approximation of the transition zone is generated, which can be used to predict the effects of the transition zone on the dynamic performance of a rotor machined from the forging.

US Patent:

7546685, Jun 16, 2009

Filed:

Mar 1, 2005

Appl. No.:

11/070467

Inventors:

Swami Ganesh - Clifton Park NY, US
Robin Carl Schwant - Pattersonville NY, US
Ling Yang - Niskayuna NY, US
John Zhiqiang Wang - Greenville SC, US
Francis Alexander Reed - Scotia NY, US
Robert V. Falsetti - Schenectady NY, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

B23P 15/02

US Classification:

2988971, 29889, 298892, 298897

Abstract:

A process for producing a rotor, the rotor formed thereby, as well as turbines in which such a rotor is installed. The rotor is formed by casting an ingot to have first and second regions formed of different alloys that intermix during casting to define a transition zone therebetween. The ingot is forged to yield a rotor forging that contains axially-aligned first and second alloy regions and a transition zone therebetween. The effects of the transition zone can be mitigated by modeling the transition zone and then off-center machining the forging so that the axis of rotation of the machined monolithic rotor is more centrally located with respect to the transition zone.