DEVELOPMENT OF AN ACCELERATED TEST METHODOLOGY FOR NEAR-THRESHOLD CORROSION FATIGUE TESTING OF WELDED SHIPBUILDING STEELS IS PROPOSED.

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$48,393.00
Award Year:
1986
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Agency Tracking Number:
4170
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Msnw Inc
Po Box 865, San Marcos, CA, 92069
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
DR GEORGE H REYNOLDS
(619) 744-7658
Business Contact:
() -
Research Institution:
n/a
Abstract
DEVELOPMENT OF AN ACCELERATED TEST METHODOLOGY FOR NEAR-THRESHOLD CORROSION FATIGUE TESTING OF WELDED SHIPBUILDING STEELS IS PROPOSED. MIL S-24645 CLASS 3 HSLA STEEL WILL BE USED FOR INITIAL DEMONSTRATION OF THE TECHNIQUE. PRE-TEST MATERIALS CHARACTERISTIZATION WILL INCLUDE MICROSTRUCTURAL FEATURES AND ELECTROCHEMICAL BEHAVIOR. PHASE 1 NEAR-THRESHOLD CORROSION FATIGUE TESTS WILL BE PERFORMED ON BASE METAL SPECIMENS IN SYNTHETIC SEAWATER AT 0 DEG AND 20 DEG F AT THE FREE CORROSION POTENTIAL AND TWO LEVELS OF CATHODIC PROTECTION FOR A SINGLE TEST TEMPERATURE. POST-TEST CHARACTERIZATION OF CORROSION FATIGUE TEST SPECIMENS WILL ATTEMPT TO RELATE OBSERVED MICROSTRUCTURAL FEATURES AND CORROSION PRODUCTS TO TEST VARIABLES AND CORROSION FATIGUE PROCESS MECHANISTICS. SUBMERGED ARC AND PULSED GAS METAL ARC WELDING PROCEDURES WILL BE DEVELOPED TO PROVIDE WELDMENT TEST SPECIMENS SUITABLE FOR ISOSTRUCTURAL CRACK PROPAGATION CORROSION FATIGUE TESTS OF WELD METAL AND HEAT AFFECTED ZONES IN PHASE 2.

* information listed above is at the time of submission.

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