Combined atom-probe and electron microscopy characterization of fine scale structures in aged primary coolant pipe stainless steel
The capabilities and complementary nature of atom probe field-ion microscopy (APFIM) and analytical electron microscopy (AEM) for the characterization of fine-scale microstructures are illustrated by examination of the changes that occur after long term thermal aging of cast CF 8 and CF 8M duplex stainless steels. In material aged at 300 or 400/sup 0/C for up to 70,000 h, the ferrite had spinodally decomposed into a modulated fine-scaled interconnected network consisting of an iron-rich ..cap alpha.. phase and a chromium-enriched ..cap alpha..' phase with periodicities of between 2 and 9 nm. G-phase precipitates 2 to 10 nm in diameter were also observed in the ferrite at concentrations of more than 10/sup 21/ m/sup -3/. The reported degradation in mechanical properties is most likely a consequence of the spinodal decomposition in the ferrite.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6587016
- Report Number(s):
- CONF-861207-91; ON: DE87007365; TRN: 87-018391
- Resource Relation:
- Conference: Materials Research Society fall meeting, Boston, MA, USA, 1 Dec 1986; Other Information: Microfiche only, copy does not permit paper copy reproduction
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
22 GENERAL STUDIES OF NUCLEAR REACTORS
PRIMARY COOLANT CIRCUITS
PIPES
STAINLESS STEELS
MECHANICAL PROPERTIES
MICROSTRUCTURE
WATER COOLED REACTORS
AGING
ELECTRON MICROSCOPY
HIGH TEMPERATURE
INSPECTION
ION MICROSCOPY
REACTOR MATERIALS
TEMPERATURE EFFECTS
THERMAL DEGRADATION
ALLOYS
CHROMIUM ALLOYS
COOLING SYSTEMS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
ENERGY SYSTEMS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MICROSCOPY
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTORS
STEELS
360103* - Metals & Alloys- Mechanical Properties
220200 - Nuclear Reactor Technology- Components & Accessories