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A temperature dependent cyclic plasticity model for hot work tool steel including particle coarsening

  • Hot work tools are subjected to complex thermal and mechanical loads during hot forming processes. Locally, the stresses can exceed the material’s yield strength in highly loaded areas as e.g. in small radii in die cavities. To sustain the high loads, the hot forming tools are typically made of martensitic hot work steels. While temperatures for annealing of the tool steels usually lie in theHot work tools are subjected to complex thermal and mechanical loads during hot forming processes. Locally, the stresses can exceed the material’s yield strength in highly loaded areas as e.g. in small radii in die cavities. To sustain the high loads, the hot forming tools are typically made of martensitic hot work steels. While temperatures for annealing of the tool steels usually lie in the range between 400 and 600 °C, the steels may experience even higher temperatures during hot forming, resulting in softening of the material due to coarsening of strengthening particles. In this paper, a temperature dependent cyclic plasticity model for the martensitic hot work tool steel 1.2367 (X38CrMoV5-3) is presented that includes softening due to particle coarsening and that can be applied in finite-element calculations to assess the effect of softening on the thermomechanical fatigue life of hot work tools. To this end, a kinetic model for the evolution of the mean size of secondary carbides based on Ostwald ripening is coupled with a cyclic plasticity model with kinematic hardening. Mechanism-based relations are developed to describe the dependency of the mechanical properties on carbide size and temperature. The material properties of the mechanical and kinetic model are determined on the basis of tempering hardness curves as well as monotonic and cyclic tests.show moreshow less

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Metadaten
Author:Andreas Jilg, Thomas Seifert
Publisher:American Institute of Physics
Year of Publication:2018
Language:English
GND Keyword:Mikrostruktur; Plastizität; Stahl
Tag:cyclic plasticity; hot work tool steel; particle coarsening
DDC classes:600 Technik, Medizin, angewandte Wissenschaften
Parent Title (English):AIP Conference Proceedings
Volume:1960
Issue:1
ISSN:1551-7616
First Page:170007-1
Last Page:170007-6
Document Type:Conference Proceeding
Institutes:Hochschule Offenburg / Bibliografie
Acces Right:Zugriffsbeschränkt
Release Date:2019/01/03
Licence (German):License LogoEs gilt das UrhG
DOI:https://doi.org/10.1063/1.5035064