Role of Metallographic Analysis in the Identification of Location of Crack Initiation in a Burst Tested AA 2219 Propellant Tank

摘要

Owing to its excellent combination of weld-ability and strength at low temperatures (up to 4 K), aluminum alloy AA 2219 is the material of choice for the design of propellant tanks for cryogenic engines of satellite launch vehicles. In order to assess the design margins available, one propellant tank has been subjected to burst test. This paper highlights the role of microstructural analysis conducted on the burst tested propellant tank in locating the origin of crack initiation. Specimens collected from different locations of the burst tested tank have been subjected to optical microscopy and scanning electron microscopy to locate the origin of crack initiation.