Effect of temperature on the fracture toughness behavior of Inconel X-750
Conference
·
OSTI ID:5880536
The elastic-plastic J/sub Ic/ fracture toughness response of precipitation heat treated Inconel X-750 was evaluated by the multi-specimen resistance curve (R-curve) technique at room temperature and elevated temperatures. The fracture toughness of this nickel-base superalloy was found to increase slightly at intermediate temperatures (approximately 427/sup 0/C), but it decreased dramatically at the highest test temperature (649/sup 0/C). Metallographic and electron fractographic examination of the Inconel X-750 fracture surfaces revealed that the slight increase in J/sub Ic/ at intermediate temperatures was associated with an intergranular to transgranular fracture mechanism transition. Under room temperature conditions, crack extension occurred primarily by an intergranular dimple rupture mechanism attributed to microvoid coalescence along a grain boundary denuded region. In the 427 to 538/sup 0/C regime, the fracture surface was dominated by a transgranular morphology consisting of poorly defined dimples coupled with a rather flat, faceted appearance. At the highest test temperature (649/sup 0/C), intense heterogeneous slip initiated localized separation which resulted in a very faceted fracture surface morphology and a severe degradation in fracture toughness.
- Research Organization:
- Hanford Engineering Development Lab., Richland, WA (USA)
- DOE Contract Number:
- EY-76-C-14-2170
- OSTI ID:
- 5880536
- Report Number(s):
- HEDL-SA-1818; CONF-791115-2
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Thu Sep 01 00:00:00 EDT 1977
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Journal Article
·
Sun Jun 01 00:00:00 EDT 1980
· Metall. Trans., A; (United States)
·
OSTI ID:5348983
Related Subjects
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
AEROSPACE INDUSTRY
ALLOYS
ANNEALING
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
CRACKS
CRYSTAL STRUCTURE
DUCTILITY
FRACTURE PROPERTIES
GRAIN BOUNDARIES
HEAT TREATMENTS
HIGH TEMPERATURE
INCONEL ALLOYS
INCONEL X750
INDUSTRY
IRON ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MIGRATION
MORPHOLOGY
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUCLEAR INDUSTRY
SLIP
SURFACES
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TITANIUM ALLOYS
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
AEROSPACE INDUSTRY
ALLOYS
ANNEALING
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
CRACKS
CRYSTAL STRUCTURE
DUCTILITY
FRACTURE PROPERTIES
GRAIN BOUNDARIES
HEAT TREATMENTS
HIGH TEMPERATURE
INCONEL ALLOYS
INCONEL X750
INDUSTRY
IRON ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MIGRATION
MORPHOLOGY
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUCLEAR INDUSTRY
SLIP
SURFACES
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TITANIUM ALLOYS