ENVIRONMENT ASSISTED FRACTURE IN HIGH STRENGTH STEELS

Susceptibility to environmentally-assisted fracture at low stress levels is a characteristic of low alloy high-strength steels, such that the fracture toughness under sustained loading may be reduced to a fraction of the normal kic. While the phenomenon may be separately identified as stress-corrosion cracking or as hydrogen embrittlement, the mechanism is now thought to be the same in both cases and it is considered that the embrittling effect of hydrogen results from a weakening of the cohesive forces between atoms in the steel. The present work has established an empirical relationship between environmentally-assisted fracture toughness kiscg and kic so that kiscg may be estimated from the more readily determined kic. Furthermore environmentally-assisted fracture is not a serious problem when kic is greater than 0.001mnm. Where kic is lower, linear elastic fracture mechanics can be successfully applied to environment-assisted fracture in high-strength steels using kiscg as a design criterion. The factors which need to be considered in designing components to resist environmentally-enhanced fracture are discussed. (a). The number of the covering abstract of the conference is IRRD abstract no 213776. /TRRL/

  • Supplemental Notes:
    • Presented at the First Australian Conference on Engineering Materials.
  • Corporate Authors:

    University of New South Wales

    School of Civil Engineering, Anzac Parade
    Kensington, New South Wales  Australia  2033
  • Authors:
    • Bloomery, R I
    • Corderoy, DJH
    • Muir, H
  • Publication Date: 0

Media Info

  • Features: Figures; References;
  • Pagination: 16 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00129583
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Conf Paper
  • Files: ITRD, TRIS
  • Created Date: Apr 7 1976 12:00AM