Research on hydrogen effects on phase distribution ahead of propagating cracks in stainless steel. Final report
- Univ. of Illinois, Urbana, IL (United States). Dept. of Materials Science and Engineering
This research was performed in support of computations to determine the distribution of hydrogen at a crack tip in an unstable stainless steel. It involved metallographic observations of the distribution of martensite at a stressed crack tip. It is concluded that the martensite phase distribution is much too fine to model realistically by the finite element method when far-field stress effects must be included. The mesh size would have to be less than 50 micrometers in order to include the effects of non-uniform distribution of martensite within a single grain. This would lead to unrealistic computation times. A reasonable compromise is to assume that a finite element will be considered to change from the hydrogen diffusivity of the austenite to that of the bcc martensitic phase when the yield stress of the austenite has been reached. This should give a significantly different hydrogen distribution from the case of untransforming austenite and allow the FEM computations to verify or disprove the kinetic model of hydrogen embrittlement of unstable austenitic stainless steels.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Illinois Univ., Urbana, IL (United States). Dept. of Materials Science and Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 106638
- Report Number(s):
- LA-SUB-93-155; ON: DE96000175; CNN: Subcontract 9-HG0-H0655-1; TRN: AHC29525%%139
- Resource Relation:
- Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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