M. J. Crill, D. J. Chellman, J. E. Barnes, W. R. Garver, C. A. Brice, Lockheed Martin Aeronautics, Fort Worth, TX

Summary:

Titanium alloy airframe structural components fabricated using laser deposition manufacturing (LDM) processes have been evaluated by Lockheed Martin Aeronautics. Evaluations were performed on components simulating typical F/A-22 and F-35 geometries. The intent was to determine if laser deposition processes are currently capable of producing defect-free structures possessing adequate material properties. Included in these evaluations were basic static property, fatigue, toughness, and corrosion tests for a variety of structural types and powder lots. Additionally, Ti-6-4 LDM microstructures were prepared and characterized. Results will be compared against success criteria established by the F/A-22 program and conventional Ti-6Al-4V product form design allowables. Producibility guidelines developed to govern future usage including economically suitable structures, lessons learned, and process enhancements will be discussed. Recommendations on the necessary steps for continued implementation within the aerospace industry will be given.