Paper Title:
Creep and Fatigue Damage in Hot Work Tools Steels during Copper and Aluminium Extrusion
  Abstract

During hot extrusion, tools experience cyclic thermo-mechanical loads that can lead to materials degradation and failure. For a process optimization and study of the occurring damage mechanisms, the finite element method (FEM) is an appropriate means. Local inelastic strains result from the interaction of the applied temperature and stress loading and can be computed by suitable inelastic constitutive equations. Stress amplitudes and dwell times during extrusion result in creepfatigue damage. A lifetime consumption model sums increments of a damage variable over time and defines materials failure as the accumulation of the resulting damage variable to a critical value. The predominant failure mechanism, i.e. creep or fatigue, can be found by the investigation of the damage rate over several cycles. A comparison of both a creep dominated (copper extrusion) and a fatigue controlled (aluminium extrusion) lifetime consumption in an extrusion die is shown with the hot work tool steel Böhler W300 ISOBLOC in comparison with W400 VMR (both ~ EN 1.2343).

  Info
Periodical
Edited by
Luca Tomesani and Lorenzo Donati
Pages
169-176
DOI
10.4028/www.scientific.net/KEM.367.169
Citation
C. Sommitsch, T. Wlanis, T. Hatzenbichler, C. Redl, "Creep and Fatigue Damage in Hot Work Tools Steels during Copper and Aluminium Extrusion", Key Engineering Materials, Vol. 367, pp. 169-176, 2008
Online since
February 2008
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