SEDL / STP / STP432-EB / STP33623S

Metallurgical and Mechanical Aspects of the Sea-Water Stress Corrosion of Titanium

Lane, IR
Physical metallurgists, Marine Engineering LaboratoryNaval Ship Research and Development Center, Annapolis, Md.

Cavallaro, JL
Physical metallurgists, Marine Engineering LaboratoryNaval Ship Research and Development Center, Annapolis, Md.

Pages: 23    Published: Jan 1968

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Abstract

Results of concentrated investigations on the sea-water stress corrosion of titanium indicate that the behavior is dependent on certain mechanical factors and on the metallurgical structure. The mechanical factors include a requirement that localized plastic deformation induce the formation of a coarse slip step. A possible further requirement is that the slip step occurs under crevice conditions. Recent work on the titanium-aluminum system, including kinetics of reactions occurring in the system, add to the evidence that stress corrosion is associated with the presence of the coherent Ti³Al precipitate. The most effective method for control of stress corrosion in titanium alloys containing aluminum is inhibition of the formation of Ti³Al by control of composition and heat treatment.