Fundamental studies of stress distributions and stress relaxation in oxide scales on high temperature alloys
The high temperature X-ray diffraction system developed for this program is being used to measure the strains which develop during oxidation. This is being applied to Ni/NiO and Cr/Cr[sub 2]O[sub 3]. Our work suggests tat the oxide and metal crystalline texture, anisotropic elastic modulus and anisotropic thermal expansion can have a pronounced effect on strain state of these systems. Acoustic emission is being used to study oxide scale failure (fracture) during oxidation. AE data from 304 stainless steel are being used to develop a statistical model of fracture process. Strength of metal/scale interface is an important property that has been difficult to quantify. Using Nano-indentation and scratch techniques developed for characterizing thin film interfaces, an effort has begun to measure the fracture toughness of the metal/scale interface. Mathematical modelling of origin and time evolution of growth stresses is an extension and improvement of previous models. The current effort employs a more sophisticated stress analysis and expands the scope to include other stress relaxation process. The interaction between the modeling studies and the X-ray diffraction measurements provides a natural credibility check to both efforts.
- Research Organization:
- Minnesota Univ., Minneapolis, MN (United States). Corrosion Research Center
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-88ER45337
- OSTI ID:
- 7018555
- Report Number(s):
- DOE/ER/45337-5; ON: DE93003654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM
OXIDATION
HEAT RESISTING ALLOYS
SCALING
NICKEL
NICKEL OXIDES
ADHESION
OXIDES
STRESS RELAXATION
STRESSES
ACOUSTIC EMISSION TESTING
INTERFACES
PROGRESS REPORT
STAINLESS STEEL-304
STRESS ANALYSIS
X-RAY DIFFRACTION
ACOUSTIC TESTING
ALLOYS
AUSTENITIC STEELS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
COHERENT SCATTERING
CORROSION RESISTANT ALLOYS
DIFFRACTION
DOCUMENT TYPES
ELEMENTS
HEAT RESISTANT MATERIALS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
METALS
NICKEL ALLOYS
NICKEL COMPOUNDS
NONDESTRUCTIVE TESTING
OXYGEN COMPOUNDS
RELAXATION
SCATTERING
STAINLESS STEELS
STEEL-CR19NI10
STEELS
TESTING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
360105 - Metals & Alloys- Corrosion & Erosion