Abstract
Hoar and Hines1–5 have studied the transgranular stress-corrosion cracking of 18–8 type stainless steels in aerated aqueous magnesium chloride solution (42 wt.-per cent of magnesium chloride) at temperatures of 120–154° C., using thin wires directly stressed in tension. They found rates of crack propagation in the range 0.5–2 mm./hr., similar to those found in other work using much thicker material, and several orders of magnitude smaller than the rate of cracking in mechanical brittle fracture. They suggested that a crack is propagated by the selective anodic dissolution of the highly stressed metal forming its advancing edge, the unstressed sides of the crack remaining relatively unattacked.
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References
Hoar, T. P., and Hines, J. G., J. Iron and Steel Inst., 182, 124 (1956).
Hines, J. G., and Hoar, T. P., J. Iron and Steel Inst., 184, 166 (1956).
Hoar, T. P., and Hines, J. G., Symposium on Stress Corrosion Cracking and Emorittlement, 107 (Wiley, 1956).
Hoar, T. P., and Hines, J. G., International Committee for Electrochemical Thermodynamics and Kinetics (CITCE), 8th Meeting (Butterworths, London) (in the press).
Hines, J. G., and Hoar, T. P., J. App. Chem. (in the press).
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HOAR, T., WEST, J. Mechano-Chemical Anodic Dissolution. Nature 181, 835 (1958). https://doi.org/10.1038/181835a0
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DOI: https://doi.org/10.1038/181835a0
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