TY  - CHAP
U1  - Konferenzveröffentlichung
A1  - Jilg, Andreas
A1  - Seifert, Thomas
ED  - Fratini, Livan
ED  - Di Lorenzo, Rosa
ED  - Buffa, Gianluca
ED  - Ingarao, Giuseppe
T1  - A temperature dependent cyclic plasticity model for hot work tool steel including particle coarsening
T2  - AIP Conference Proceedings
N2  - 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 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.
KW  - Plastizität
KW  - cyclic plasticity
KW  - Stahl
KW  - Mikrostruktur
KW  - hot work tool steel
KW  - particle coarsening
Y1  - 2018
SN  - 1551-7616
SS  - 1551-7616
SN  - 978-0-7354-1663-5
SB  - 978-0-7354-1663-5
U6  - https://doi.org/10.1063/1.5035064
DO  - https://doi.org/10.1063/1.5035064
VL  - 1960
IS  - 1
SP  - 170007-1
EP  - 170007-6
PB  - American Institute of Physics
ER  -