The propensity of thermally stabilized Inconel 600 to undergo low temperature stress corrosion cracking (SCC) in sulfur bearing environments has been investigated with U-bends and slow strain rate testing. The results have been compared with those of sensitized Inconel 600. The potential dependence of crack propagation rate has been established in a single test by using several U-bends held at different potentials by choosing an appropriate electrical circuitry. The difference in SCC susceptibility of the sensitized and stabilized materials has been discussed in terms of the grain boundary chromium depletion and resultant intergranular attack in boiling ferric sulfate-sulfuric acid tests, and electrochemical potentiokinetic reactivation (EPR) tests.

Subject
Materials, Intergranular stress corrosion cracking, Precipitates, Nickel based alloys, Transmission electron microscopy, Corrosion attacks, U bends, Optical micrographs, Heat, Immersion, Grain boundary, Corrosion potential, Electrode potential
National Association of Corrosion Engineers
1984
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