The effect of process perturbations on the local thermal environment in VAR alloy 718
- Sandia National Labs., Albuquerque, NM (United States)
- Carpenter Technology Corp., Reading, PA (United States)
- Teledyne Allvac, Monroe, NC (United States)
Melt pool shape in VAR is controlled by fluid flow, which is governed by the balance between two opposing flow fields. At low melt currents, flow is dominated by thermal buoyancy. In these instances, metal is swept radially outward on the pool surface, resulting in relatively shallow melt pools but increased heat transfer to the crucible at the melt pool surface. At high melt currents, flow is primarily driven by magento-hydrodynamic forces. In these cases, the surface flow is radially inward and downward, resulting in a constricted arc, the pool depth and relative heat transfer to the crucible are intermediate, even though the melt rate is significantly lower than either diffuse arc condition. Constricted arc conditions also result in erratic heat transfer behavior and non-uniformities in pool shape.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5837191
- Report Number(s):
- SAND-92-0593C; ON: DE92009067
- Country of Publication:
- United States
- Language:
- English
Similar Records
Vacuum arc remelting of Alloy 718
Monochromatic imaging studies of a low pressure arc burning on molten Inconel 718 alloy electrodes during vacuum arc remelting
Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
ALLOY-NI53CR19FE19NB5MO3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
DIFFUSION
ELECTRODES
ENERGY TRANSFER
FABRICATION
FLUID FLOW
FLUID MECHANICS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TRANSFER
HYDRODYNAMICS
INCONEL 718
INCONEL ALLOYS
IRON ALLOYS
JOINING
MAGNETOHYDRODYNAMICS
MATERIALS
MECHANICS
MELTING
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM A
PHASE TRANSFORMATIONS
THERMAL DIFFUSION
VACUUM MELTING
WELDING