Mechanical properties and microstructure of centrifugally cast alloy 718
Journal Article
·
· Metall. Trans., A; (United States)
The relationship between the microstructure and mechanical properties of alloy 718 was investigate for two discs centrifugally cast at 50 and 200 rpm and given a duplex age heat treatment. The results of mechanical property tests at temperatures from 426 to 649/sup 0/C showed that the tensile, yield and ultimate strength levels of both castings were similar. However, the creep-rupture properties were considerably enhanced for the casting produced at 200 rpm. Comparison of the radial and transverse creep properties of each disc indicated that creep life was generally independent of orientation, but ductility was greatest for specimens oriented transverse to the radial direction of the casting. Fatigue crack propagation performance was not greatly influenced by orientation or mold speed parameters and is comparable to wrought alloy 718 when compared on the basis of stress intensity factor range. The centrifugal casting process was found to produce a homogeneous microstructure free of porosity but with the expected segregation of solute alloying elements to Laves and carbide phases. The effect of the as-cast microstructure on the mechanical behavior and the potential influence of hot isostatic pressing to improve the microstructure are discussed.
- Research Organization:
- Naval Research Laboratory, Washington, DC
- OSTI ID:
- 6088405
- Journal Information:
- Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 16A:7; ISSN MTTAB
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of interactions between bubbles and graphite particles in copper alloy melts on microstructure formed during centrifugal casting. Part 2: Experiments
Status Report of Physical and Mechanical Test Data of Alloy 718
The cast structure of a 7075 alloy produced by a water-cooling centrifugal casting method
Journal Article
·
Tue Jun 01 00:00:00 EDT 1999
· Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
·
OSTI ID:364009
Status Report of Physical and Mechanical Test Data of Alloy 718
Technical Report
·
Fri Sep 01 00:00:00 EDT 1978
·
OSTI ID:6807751
The cast structure of a 7075 alloy produced by a water-cooling centrifugal casting method
Journal Article
·
Mon Feb 28 23:00:00 EST 1994
· Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)
·
OSTI ID:7207567
Related Subjects
36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CARBIDES
CARBON COMPOUNDS
CASTING
CENTRIFUGATION
CHROMIUM ALLOYS
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
FABRICATION
HIGH TEMPERATURE
HOT PRESSING
INCONEL 718
INCONEL ALLOYS
LAVES PHASES
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
PRESSING
SEPARATION PROCESSES
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CARBIDES
CARBON COMPOUNDS
CASTING
CENTRIFUGATION
CHROMIUM ALLOYS
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
FABRICATION
HIGH TEMPERATURE
HOT PRESSING
INCONEL 718
INCONEL ALLOYS
LAVES PHASES
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
PRESSING
SEPARATION PROCESSES