The Evolution of Ultra-High Strength Steels, and Research on Materials and Various Novel Techniques of Fabrication of High Performance Rocket Motor Cases.
MELLON INST PITTSBURGH PA
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Fine wires 0.005 in. diam were drawn of 3 Al alloys, and effort was directed toward the production of Be wire. Study was continued of steel melting and casting techniques. Mechanical property tests of butt welds indicated that the addition of W facilitates the weldability of high tensile strength 300 ksi steels. Studies are continuing on weld grain refinement with ultrasonic excitation. Filler wire evaluation was discontinued. Scale-model 3.5-in.-diam chambers heat treated to several strength levels were hydrotested. Rocoloy 270 showed considerable yielding biaxial ductility prior to fracture.