Structure/property/continuum synthesis of ductile fracture in Inconel alloy 718
Journal Article
·
· Metall. Trans., A; (United States)
- Michigan Technological Univ., Houghton
Two microscopic ductile fracture processes have been established in a fracture tough superalloy, Inconel 718, aged to five strength levels. At yield strengths less than 800 MPa, the mechanism is a slow tearing process within large pockets of inhomogeneous carbides and nitrides, giving rise to plane strain fracture toughness (K/sub IC/) values greater than 120 MPa-m/sup 1/2/. At yield strengths greater than 900 MPa, the mechanism involves fracture initiation at carbides and nitrides followed by off crack plane void sheet growth nucleated at the Laves (sigma) phases. Here, the fracture toughness drops to about 80 MPa-m/sup 1/2/. A Mode I normal strain growth model for low yield strength conditions and a shear strain void sheet model for high yield strength ones are shown to model K/sub IC/ data obtained from a J-integral evaluation of compact tension results.
- OSTI ID:
- 6518529
- Journal Information:
- Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 9:5; ISSN MTTAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
COALESCENCE
CRACKS
CRYSTAL STRUCTURE
DUCTILITY
FAILURES
FRACTURE PROPERTIES
FRACTURES
HARDENING
HEAT TREATMENTS
INCONEL 718
INCONEL ALLOYS
LAVES PHASES
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
NUCLEATION
PLASTICITY
STRAIN HARDENING
SURFACES
TENSILE PROPERTIES
VOIDS
YIELD STRENGTH
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
COALESCENCE
CRACKS
CRYSTAL STRUCTURE
DUCTILITY
FAILURES
FRACTURE PROPERTIES
FRACTURES
HARDENING
HEAT TREATMENTS
INCONEL 718
INCONEL ALLOYS
LAVES PHASES
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
NUCLEATION
PLASTICITY
STRAIN HARDENING
SURFACES
TENSILE PROPERTIES
VOIDS
YIELD STRENGTH