INVESTIGATION OF STRESS-CORROSION CRACKING OF HIGH-STRENGTH ALLOYS
Abstract
Results obtained to date indicate that the 6A1 4V titanium alloy is immune to stress-corrosion cracking in the annealed, quenched and aged and as- welded conditions. The 20%-nickel maraging steel was found to be highly susceptible to stress-corrosion cracking in the annealed-and aged condition. Welding and aging the material causes it to become more susceptible; all failures occur in the heat-affected zone of the weld. When the alloy is cold- worked 50 or 75% before aging, the resistance to stress-corrosion cracking is greatly increased. The 18%-nickel maraging steel was also found to be susceptible to stress-corrosion cracking. While the 18% nickel grade was found to have a longer time to-failure than the annealed-and-aged 20%-nickel steel in the distilled water, salt water, sea coast air, trichloroethylene, and 140 F water saturated air environments, it showed some failures in tap water, chromate solution and soluble oil solutions where the 20%-nickel grade was not affected. It was found that prior cold working decreased the stress-corrosion cracking susceptibility. Fifteen coating systems designed to prevent stress-corrosion cracking are under evaluation over H-11 steel. The most promising systems are the two inhibited epoxy and one pure vinyl system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 1963
- Accession Number
- AD0406056
Entities
People
- R. B. Setterlund
Organizations
- Aerojet Rocketdyne Holdings