✦ LIBER ✦

Mechanism of corrosion fatigue crack propagation in high strength steels

✍ Scribed by Nakasa Keijiro; Takei Hideo; Itoh Hisashi

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 922 KB
Volume: 17
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(83)90041-3

No coin nor oath required. For personal study only.

✦ Synopsis

The crack propagation velocity in corroGon fatigue (du/dN), were measured on the Ni-Cr-Mo steel quenched and tempered at 473 or 773 K. The steel with high sensitivity to delayed failure reveals the largest (du/dN), under square load and the smaller (da/dN), under positive saw tooth load. The frequency dependency of crack propagation characteristics indicates that the interaction between hydrogen atoms and the cyclic moving of triaxial position at crack tip acts an important role in the crack propagation mechanism, i.e. hydrogen concentration process controls the crack propagation of the steel. The steel with low susceptibility to delayed failure reveals, on the other hand, the largest (du/dN), under the positive saw tooth load but the smallest (da/dN), under the square load, i.e. the stress increasing time is important and the hydrogen invasion process is the controlling factor for the crack propagation.

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