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The effects of heat treatment, applied stress and crevice on the stress corrosion cracking (SCC) of Inconel alloy X-750 in 288C pure water were evaluated by means of a creviced bent beam test and a uniaxial constant load test. Also the metallurgical factor for SCC was discussed. The results obtained are summarized as follows: (1) The morphology of SCC is basically intergranular. (2) The materials given a solution annealing in the range 1050 N 1100C and a direct aging at 704C show the lowest SCC susceptibility, and are fully resistant to failure under applied stresses around the yield strength. (3) The materials given a two-step aging including an intermediate treatment at around 850C were highly susceptible to SCC, and fractured even under an applied stress below the yield strength. (4) The crevice obviously accelerates SCC, but it is not a necessary condition for SCC. (5) The metallurgical cause for SCC in the directly aged material seems to be the Cr depletion, while that for the high susceptibility in the two-step aged material has not been clarified.

Factors affecting Stress Corrosion Cracking of Inconel X-750 in High Temperature Pure Water