STRESS-CORROSION CRACKING OF HIGH-STRENGTH ALLOYS
Quarterly progress rept. no. 9, 1 Jan-31 Mar 1963
AEROJET-GENERAL CORP AZUSA CA
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Test results showed that, under all the test conditions of this program, the 6A1-4V titanium alloy is immune to stress-corrosion cracking in the annealed, quenched-and-aged, and as-welded conditions. The 20-nickel grade of maraging steel was found to be highly susceptible to stress-corrosion cracking in the annealed-and aged condition. This same alloy, when cold worked 50 to 75 before aging, was found to be only mildly susceptible to stress- corrosion cracking. The most favorable mechanical proper ties were attained after 50 cold reduction and subsequent aging. The welded-and-aged alloy was found to be extremely susceptible to stress corrosion cracking in the weld-heat- affected zone. The 18-nickel grade of maraging steel was also found to be susceptible to stress-corrosion cracking, which was found to occur more rapidly in the annealed-and-aged material than in the 50 cold-worked-and-aged material.
- Metallurgy and Metallography