Deformation induced microstructural and microchemical changes during thermomechanical treatment. FY 91 quarterly annual progress report, April 1, 1991--June 30, 1991
- Oregon Graduate Inst. of Science and Technology, Beaverton, OR (United States)
- Pacific Northwest Lab., Richland, WA (United States)
This quarter`s effort has been directed towards development and assessment of the capability to predict sensitization development, in particular, sensitization development during continuous cooling. Model predictions are first compared to a continuous cooling (plus prestrain) data base developed under Nuclear Regulatory Commission funding. Parallel model development allowed prediction of weld thermal histories, assessment of weld induced sensitization, and prediction of weldment susceptibility to intergranular stress corrosion cracking (IGSCC). It has long been known that IGSCC of austenitic Type 300 Series stainless steels (SS) is directly related to the presence of grain boundary chromium depletion, and that this depletion, also called ``sensitization``, is caused by the formation of grain boundary chromium carbides/nitrides. Thus is is well documented that susceptibility to IGSCC is caused by a diffusion controlled process. However, quantification of this phenomena is still on active research area, and the research reported herein pertains to the development of a computer-based model capable of predicting IGSCC susceptibility in the heat affected zone (HAZ) of Type 304 and 316 SS girth pipe weldments. Model predictions are based on prediction of chromium depletion at grain boundaries. It is assumed that as grain boundary sensitization increases susceptibility to IGSCC increases. The model predicts levels of sensitization, with susceptibility to IGSCC estimated on a system by system assessment.
- Research Organization:
- Oregon Graduate Inst. of Science and Technology, Beaverton, OR (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-86NE37963
- OSTI ID:
- 10108231
- Report Number(s):
- DOE/NE/37963-18; ON: DE92004392
- Resource Relation:
- Other Information: PBD: [1991]
- Country of Publication:
- United States
- Language:
- English
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