A FIELD-EMISSION MICROSCOPE INVESTIGATION OF THE EFFECTS OF AMBIENT ATMOSPHERES ON THE STRESS-CORROSION CRACKING OF URANIUM-MOLYBDENUM ALLOYS
ARIZONA UNIV TUCSON DEPT OF ELECTRICAL ENGINEERING
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The effects of heat treatment and ambient atmospheres on the stress- corrosion cracking behavior of U-10 wo Mo were investigated using a field- emission microscope of cylindrical geometry. Cathodic protection and the effect of static electric DC fields were investigated as possible protective techniques in the stress-corrosion cracking of U-10 wo Mo. A special gas shield protective technique was also investigated. The stress-corrosion cracking behavior of U-10 wo Mo was found to be influenced by heat treatments. A gamma homogenization and quench followed by a tempering treatment were found to be most beneficial in reducing the susceptibility of the alloy. A tentative critical stress for initiation of stress-corrosion cracking was set at 36,500 psi. This critical stress was found to be strongly dependent upon heat treatments and internal structure. Cathodic protection and electric fields had no effect on the stress-corrosion cracking behavior of U-10 wo Mo. Pure, dry nitrogen on the other hand, was found to be most effective as a protective shield during cyclic loading of U-10 wo Mo specimens.
- Properties of Metals and Alloys
- Fission Reactor Materials