INVESTIGATION OF STRESS-CORROSION CRACKING OF HIGH-STRENGTH ALLOYS
AEROJET-GENERAL CORP AZUSA CA
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Data to date show that the 6Al-4V titanium alloy is immune to stress- corrosion cracking under the test conditions of this program in both the annealed and in the quenched-and-aged conditions. It was found that stress- corrosion cracking occurs in both 18- and 20-nickel maraging steels, after short exposure to specific environments. The 20-nickel variety, if not coldworked, is found to crack in a branching intergranular pattern when exposed to distilled water, salt water, or a high-humidity atmosphere. However, when this same alloy is cold-worked before aging, it appears to become immune to cracking in all three of these environments. The 18-nickel maraging steel has, to date, been tested only in the cold-worked-and-aged condition. In this condition, the alloy cracks in distilled water and in a high-humidity environment the cracking pattern suggests possible failure along slipplanes.