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Corrosion fatigue behaviour of nitrogen-implanted steel in water

✍ Scribed by P. L. De Anna; G. Cerisola; P. L. Bonora; S. Lo Russo; P. Mazzoldi; I. Scotoni; C. Tosello

Publisher: John Wiley and Sons
Year: 1980
Tongue: German
Weight: 947 KB
Volume: 31
Category: Article
ISSN: 0947-5117
DOI: 10.1002/maco.19800311006

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✦ Synopsis

Abstract

The corrosion fatigue behaviour of nitrogen implanted iron in neutral solutions has been investigated utilizing the oscillating cantilever beam method, by means of electrochemical (E~corr~ vs. time plots, R~p~ measurements) and S. E. M. techniques.

The calculated corrosion rate under stagnant conditions is lowered for the implanted iron at all nitrogen doses with respect to untreated iron. The surface oxide layers achieve enhanced protecting capacity.

Consequently under a cyclic load of 25.4 kg mm^−2^, at a frequency of 16.6 Hz, cracks nucleation is delayed. The time to breaking of implanted specimens is considerably lower in our experimental conditions compared to untreated iron. The increase in the crack growth rate is consistent with the detrimental action of structural damage following implantation. The fracture morphology is also discussed.

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