FRACTOGRAPHY OF CRACK GROWTH IN STRESS-CORROSION CRACKING AND CORROSION FATIGUE OF A NUMBER OF OFFSHORE STEELS

Three steels (1 CrMoNb, 3.5 NiCrMo and 2.25 CrMo) which could be used in tethered buoyant platforms are assessed. Corrosion fatigue and stress corrosion tests in natural seawater containing sulphide-reducing bacteria have been made on each steel in various heat-treated conditions. Fractographs documenting the development of the cracking mode are presented. Intergranular discontinuous-cleavage and micro-void coalescence are all observed at different times for the different steels. The relationship between the fractography, the microstructure of the steel and the applied stress intensity is investigated. Mechanistic models of crack growth are introduced and their relationship to observed fracture modes are discussed.

• Supplemental Notes:
  • ISOPE 93, 3rd Intl Offshore & Polar Engng Conf; 6-11 June 1993; Singapore. Sponsored by ISOPE, U.S.A. et al. Procs. Publ by ISOPE, ISBN 1-880653-08-7. Vol III, p 296 [7 p, 8 ref, 5 tab, 6 fig]
• Authors:
  • Cole, I S
  • Brook, R
• Publication Date: 1993

Language

• English

Subject/Index Terms

• TRT Terms: Corrosion; Cracking; Fatigue (Mechanics); Steel; Stress corrosion; Stress cracking; Stresses
• Uncontrolled Terms: Crack propagation
• Old TRIS Terms: Corrosion cracking; Corrosion fatigue
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00707545
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM