Abstract
The stress corrosion cracking resistance of 24 heats of INCONEL* alloy X-750 was measured in high purity pH 10 water at 360 °C. An overaging heat treatment of 96 hours at 760 °C produced an improved combination of strength and cracking resistance because of the homogenization of slip in the matrix. Examination of residual elements showed that Zr additions further improved the cracking resistance by stabilizing theγ′ precipitate in the grain boundary region. Combining the new heat treatment with the Zr addition produced approximately a 50 pct improvement in stress corrosion cracking resistance at a 10 pct lower yield strength.
Published Version
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