Accession Number : AD0429031


Title :   DESIGN, FABRICATION AND HYDROTESTING OF A 120-INCH DIAMETER PRESSURE VESSEL USING 18 PERCENT NICKEL MARAGING STEEL


Descriptive Note : Research Contract Status Rept. no. 8, 10 Oct-12 Nov 1963


Corporate Author : LOCKHEED PROPULSION CO REDLANDS CA


Personal Author(s) : Colbert, L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/429031.pdf


Report Date : Jun 1963


Pagination or Media Count : 75


Abstract : 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.


Descriptors :   *PRESSURE VESSELS , *MARAGING STEELS , CORROSION , STEEL , AUSTENITE , MARTENSITE , HYDROSTATIC PRESSURE , NICKEL ALLOYS , MICROSCOPY , FRACTOGRAPHY


Subject Categories : Couplers, Fasteners, and Joints
      Properties of Metals and Alloys


Distribution Statement : APPROVED FOR PUBLIC RELEASE