May 13 - 16, 2008
Gaylord Palms
Orlando, Florida USA

Extrusion/Die Theoretical

079 TH 
Wednesday, May 14 - 3:45pm

Lifetime Comparison of Different Hot Work Tool Steels for Extrusion Tools in Aluminum Extrusion

Christof Sommitsch, Thomas Wlanis, Friedrich Krumphals -- Christian Doppler Laboratory for Materials Modelling and Simulation, University of Leoben, Austria;
Thomas Hatzenbichler -- Materials Center Leoben, Austria;
Christian Redl -- Böhler Edelstahl GmbH, Austria

To compare lifetime behavior of different hot work tool steels, a 3-D FEA process model with viscoplastic constitutive equations calculates inelastic strains to describe strain hardening and time recovery effects of kinematic and isotropic hardening. A creep-fatigue lifetime rule for complex multiaxial loading is proposed. Stress, temperature, and lifetime consumption distribution comparisons for hot work tool steels are presented for a two-part container and die.