Corrosion Fatigue Behaviour of Armco‐Iron as a function of heat treatments

Abstract

AbstractA corrosion fatigue testing device is presented which satisfies in a simple way many needs of this kind of research. In particular, the behaviour of stresses and strains vs. time is known at every point of the specimen; load may be varied and controlled; electrochemical measures are easily obtained; reproducibility is assured. The specimen acts as a cantilever beam. Results are presented and discussed concerning alterations in the structure of Armco iron as a consequence of the following two heat treatments: A. heating in a vacuum furnace at 760°C for two hours, quenching in water (some experiments have been performed quenching in NaCl solution or in aqueous oil emulsion) at 20 °C. B. heating in a vacuum furnace at 760°C for one hour, then at 925°C for four hours, quenching under the same conditions as in A. Sensitization and protection with respect to intergranular attack and consequently to the rate of fatigue corrosion cracking respectively follow the two above mentioned heat treatments.