Deformation induced microstructural and microchemical changes during thermomechanical treatment
- 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; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-86NE37963
- OSTI ID:
- 6119499
- Report Number(s):
- DOE/NE/37963-18; ON: DE92004392
- Country of Publication:
- United States
- Language:
- English
Similar Records
Deformation induced microstructural and microchemical changes during thermomechanical treatment. Quarterly progress report, October 1, 1990--December 31, 1990
Deformation induced microstructural and microchemical changes during thermomechanical treatment. Quarterly progress report, January 1, 1991--March 31, 1991
Related Subjects
STAINLESS STEEL-304
STRESS CORROSION
THERMOMECHANICAL TREATMENTS
STAINLESS STEEL-316
CHROMIUM
GRAIN BOUNDARIES
HEAT AFFECTED ZONE
PROGRESS REPORT
SEGREGATION
ALLOYS
AUSTENITIC STEELS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CORROSION
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
DOCUMENT TYPES
ELEMENTS
FABRICATION
HEAT RESIS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS WORKING
METALS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
STAINLESS STEELS
STEEL-CR17NI12MO3
STEEL-CR19NI10
STEELS
TRANSITION ELEMENTS
ZONES
360105* - Metals & Alloys- Corrosion & Erosion
360101 - Metals & Alloys- Preparation & Fabrication