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The Microscopic Study on the Basis of Finite Element Johnson-Cook Model to Powder Compacting Mechanism

Powder high speed compaction mechanism is still a controversial issue.In order to study the densification mechanism of powder in the high speed compaction process,the article aims to study the powder densification mechanism by using the discrete density volleyball accumulation model that MSC.MARC to Ti6A14V and to describe the microscopic deformation and temperature changes of powder with Johnson-cook model. By analyzing the speed and temperature changes of particles in different position node,we found that powder particles start to deform a lot within microsecond and fill the holes and gaps of the powder in the flow,so that the air in the particles will form high-pressure and high-energy in a relatively adiabatic environment and make the temperature high and partial melting of the particle surface. It proves that the consolidation is the major mechanism of particles’large deformation,heat and soften hot-melt process in a short time.