Stress corrosion cracking (SCC) in selected depleted uranium alloys in salt ladened moist air environments has been studied by cantilever beam testing. Crack growth kinetics were monitored during the test using a computer data acquisition system. Continuous measurements of crack growth with time showed discontinuous crack growth with increasing KI. Threshold stress intensity values for stress corrosion cracking KISCC, were found to be 24.4 MPa - m½ and 15.6 MPa - m½ for U-3/4 Ti and DU-3/4 Quintalloys, respectively. Values for U-2 Mo in two heat treated conditions were slightly less than the U-3/4 Ti threshold. Data is presented in a "safe zone" plot of flaw size vs applied stress. Fractographic investigation by scanning electron microscopy revealed mixed fracture modes with both transgranular and intergranular fracture occurring.

Subject
Crack growth, Materials, Intergranular stress corrosion cracking, Salts, Molybdenum alloys, Uranium, Micrography, Stress, Fracture, Titanium alloys, Alloys, Stress corrosion cracking, Electrolytes
National Association of Corrosion Engineers
1981
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