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In this study a group of high strength microalloyed steels has been characterized under stress corrosion cracking (SCC) and hydrogen induced cracking (HIC) in different environmental conditions. A J-integral based elastic-plastic fracture mechanics analysis was applied to these SCC and HIC behaviours. An analytical and experimental procedures was defined and used to determine the HIC behaviour of microalloyed steels through parameters associated to initiation and crack propagation rate. A local approach model applied shows that the crack propagation in HIC takes place as a succession of isolated local fractures which are nucleated and developed in the crack-tip plastic zone where hydrogen establishes critical strain conditions. Based on finite elements analysis crack propagation models in the elastic-plastic regime have been prepared to model SCC. A first model reproduces cracking behaviour. A second model is presented to reproduce hydrogen mobility inside the material. Both are combined to create another model from which the critical parameters controlling the crack advance can be analytically determined.

Additional information

Authors: GUTIÉRREZ-SOLANA F ET AL, Universidad de Cantabria (ES);BRASS A ET AL, URA 1107, LMS Orsay (FR);COUDREUSE L ET AL, Creusot-Loire Industries (FR);ASTIZ M, Universidad Politécnica de Madrid (ES);BELZUNCE J, Instituto Tecnológico de Materíales (ES)
Bibliographic Reference: EUR 17249 EN (1997) 184pp., FS, ECU 31.50
Availability: Available from the (2)
ISBN: ISBN 92-828-0276-O
Record Number: 199710839 / Last updated on: 1997-07-02
Original language: en
Available languages: en