Pulse Current Assisted Heat Treatment for Impeller Disks

Award Information
Agency:
Department of Defense
Branch:
Army
Amount:
$70,000.00
Award Year:
2010
Program:
SBIR
Phase:
Phase I
Contract:
W911W6-11-C-0021
Agency Tracking Number:
A103-147-0419
Solicitation Year:
2010
Solicitation Topic Code:
A10-147
Solicitation Number:
2010.3
Small Business Information
Materials & Electrochemical Research (ME
7960 S. Kolb Rd., Tucson, AZ, 85756
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
147518286
Principal Investigator
 Eugene Dyadko
 Senior Scientist
 (520) 574-1980
 jcwithers@mercorp.com
Business Contact
 Raouf Loutfy
Title: President
Phone: (520) 574-1980
Email: mercorp@mercorp.com
Research Institution
N/A
Abstract
Advanced turboshaft engine impeller disks work at a high rotational speed at elevated temperatures which vary from the disk rim to its bore. Due to contact with combustion gases, the rim possesses a significantly greater temperature than the bore. This temperature gradient implies different requirements for the mechanical properties of the material in the rim and bore areas. A nickel based superalloy at the rim should have coarse grain microstructure to provide high creep resistance, while in the bore the microstructure needs to be fine to ensure high tensile properties. In order to provide such a dual microstructure, a technique which is known in powder metallurgy as plasma assisted treatment will be used. High current pulses with 40-60 Hz frequency will be applied to the impeller disk rim only, while the disk bore will be forcedly cooled. Micro plasma discharges on all the flaws inside the impeller disk rim facilitate mass transfer, motion of grain boundaries and grain growth, while the microstructure of the bore remains intact. A significant pulse current assisted grain growth in a high temperature superalloy has already been demonstrated experimentally.

* information listed above is at the time of submission.

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