Modeling and Simulation of Cavitation During Hot Working (Preprint)
Abstract
Many metallic materials develop internal cavities when subjected to large uniaxial or multiaxial tensile strains at elevated temperatures. These materials include conventional alloys of aluminum, titanium, copper, lead, and iron as well as emerging intermetallic materials such as titanium aluminide alloys. For a given material, with a given microstructure, the extent of cavitation depends on the specific deformation conditions (e.g., strain rate, temperature, and stress state). In most cases, cavitation may lead to premature failure at levels of deformation far less than those at which flow-localization-controlled failure would occur. Cavitation is a very important phenomenon in hot working of materials because it may yield inferior properties in the final part let alone lead to premature failure during forming. Cavity formation usually comprises three distinct but simultaneously occurring stages, i.e. nucleation, growth, and coalescence. An important requirement for cavitation during deformation under either conventional hot-working (high-strain-rate) conditions or superplastic forming is the presence of a tensile stress.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2009
- Accession Number
- ADA502413
Entities
People
- Ashish Ghosh
- P. D. Nicolaou
- Sheldon Lee Semiatin
Organizations
- Air Force Research Laboratory