James C Malas, 66Liberty, IN

H002227, Dec 2, 2008

Nov 13, 2002

10/295550

Prasad VRK Yellapregada - Bangalore, IN
Steven C. Medeiros - Beavercreek OH, US
William G. Frazier - Oxford MS, US
James C. Malas - Bellbrook OH, US

The United States of America as represented by the Secretary of the Air Force - Washington DC

C22F 1/18

148671

A high speed titanium alloy microstructural conversion method from lamellar to equiaxed is disclosed. The method includes identification and estimation of process parameters such that the average strain rate is between about 1-100 sand the deformation temperature of the material is in the range of about 975-1010 C.

4617817, Oct 21, 1986

Feb 6, 1985

6/698728

Harold L. Gegel - Kettering OH
James C. Malas - Dayton OH
Sokka M. Doraivelu - Beavercreek OH
Douglas R. Barker - Centerville OH
James T. Morgan - Huber Heights OH
Kristine A. Lark - Enon OH

The United States of America as represented by the Secretary of the Air
Force - Washington DC

B21J 500

72364

An improved hot forming method for metals, alloys and the like, and in particular, for difficult to process high strength and high temperature metals and alloys of particular use in aerospace applications, is described, which comprises the steps of generating flow stress data as a function of strain rate and temperature on samples of the material at predetermined strain within predetermined ranges of temperature and strain rate; determining from that data the strain rate sensitivity and power dissipation efficiency of the material within the ranges of temperature and strain rate represented by the generated data; selecting values of strain rate and corresponding temperature for a selected value of the dissipation efficiency for the material; and hot forming the material at the selected strain rate and temperature values to a predetermined shape. The improved method may be of particular application to forging, extrusion, rolling or other hot forming process appropriate for titanium, aluminum, nickel, cobalt, copper, iron, zirconium and their alloys. A processing map for hot forming each metal or alloy may be generated according to the methods taught.

4762679, Aug 9, 1988

Jul 6, 1987

7/070276

Harold L. Gegel - Kettering OH
Yellapregada V. R. K. Prasad - Bangalore, IN
Sokka M. Doraivelu - Dublin OH
Raghavan Srinivasan - Fairborn OH
J. S. Gunasekera - Athens OH
Douglas R. Barker - Centerville OH
James T. Morgan - Huber Heights OH
James C. Malas - Dayton OH
Kristine A. Lark - Enon OH
Lawrence E. Matson - Xenia OH

The United States of America as represented by the Secretary of the Air
Force - Washington DC

B22F 324

419 28

A process for manufacturing powder metallurgy (P/M) preforms which are conditioned for optimum intrinsic workability is described which comprises steps of heating a quantity of P/M material in a can to a first preselected temperature under vacuum to degas the material, compacting the canned material at a second preselected temperature under pressure to provide a compact of the material; or cold compacting the powder to about 75% density and degassing it at suitable temperature and then vacuum hot pressing the powder at about 0. 75 melting point; generating flow stress data as a function of strain rate and temperature on samples of the compact at predetermined strain within predetermined ranges of temperature and strain rate and determining powder dissipation efficiency of the compact and entropy rate ratio within those ranges of temperature and strain rate; selecting values of strain rate and extrusion temperature at which dynamic recrystallization is the dominant metallurgical mechanism characterizing the compact: and extruding the compact in an extrusion can at the selected extrusion temperature and at an extrusion rate corresponding to the selected strain rate using a streamlined die. An improved processing map for preselecting optimum processing parameters for the material is described.

6233500, May 15, 2001

Apr 2, 1998

9/053898

James C. Malas - Bellbrook OH
W. Garth Frazier - Xenia OH
Enrique A. Medina - Xenia OH
Venkat Seetharaman - Beavercreek OH
S. Venugopal - Fairborn OH
R. Dennis Irwin - Athens OH
William M. Mullins - Dayton OH
Steven C. Medeiros - Fairborn OH
Anil Chaudhary - Centerville OH
Raghavan Srinivasan - Beavercreek OH

The United States of America as represented by the Secretary of the Air
Force - Washington DC

B29F 324

700204

A method for predicting process parameters for optimization and control of microstructure in metal and alloy products of hot working fabrication processes is described. The method uses state-space material behavior models and hot deformation process models for calculating optimal strain, strain rate and temperature trajectories for processing the material. Using the optimal trajectories and appropriate optimality criteria, suitable process parameters such as ram velocity and die profile for processing the material are determined to achieve prescribed strain, strain rate and temperature trajectories.