Babout, L.

Engelberg, D.L.

Marrow, T.J.

Newman, R.C.

English

The influence of environment on the degree of susceptibility of grain boundaries, and the effect of stress on the maximum intergranular stress corrosion crack length have been investigated in a Type 304 stainless steel. Fully sensitised specimens, exposed to acidified tetrathionate (K2S4O6) solutions, indicate a shift in the intergranular corrosion susceptibility criteria with the aggressiveness of the solution. Increasing fractions of the random grain boundary population showed immunity with a rise in pH. This behaviour may be attributed to grain boundary structure related chromium depletions, with different levels of chromium being attacked by different pH solutions. IGSCC tests of statically loaded Double-Beam-Bent specimens, exposed to tetrathionate solution, showed an effect of microstructure and stress on the maximum crack length. The results are compared with existing models for percolation-like behaviour and a new grain bridging model, which includes the effect of stress. The results support the grain bridging model and highlight the disadvantages of simplified models, which include only grain boundary statistics

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Grain Boundary Engineering for Crack Bridging: Intergranular Corrosion and Stress Corrosion Crack Path Dependencies

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Grain Boundary Engineering for Crack Bridging: Intergranular Corrosion and Stress Corrosion Crack Path Dependencies

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The University of Manchester - Institutional Repository