DESIGN, FABRICATION AND HYDROTESTING OF A 120-INCH DIAMETER PRESSURE VESSEL USING 18 PERCENT NICKEL MARAGING STEEL
Research Contract Status Rept. no. 8, 10 Oct-12 Nov 1963
LOCKHEED PROPULSION CO REDLANDS CA
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The detailed metallurgical analysis work performed in order to determine the cause of closure plate fracture during hydroburst testing of the Lockheed-Excelco 120-in. diameter, maraging 18 nickel steel prototype booster case is described. The metallographic and mechanical strength data presented has led to the belief that delamination of the plate welded to the ring forging is largely responsible for the failure of the closure plate at around half the designed membrane stress. The delamination itself seems to have been triggered by the yielding of the retained austenite and cracking of carbides and nitrides in the banded areas of the plate, leading to the formation of a chain of small cracks followed by interplanar separation in the plate.
- Couplers, Fasteners and Joints
- Properties of Metals and Alloys