Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 830, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.142030
Keywords
Single crystal plasticity; Bauschinger effect; Latent hardening; Ni-base superalloys; Cyclic loading
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG) [SE 1989/8]
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This paper evaluates the Bauschinger effect and latent hardening of single crystals in finite element calculations using a single crystal plasticity model. The results show that different strength levels observed in micro-bending tests on different crystal orientations can only be described with latent kinematic hardening, while the pronounced Bauschinger effect is well described by both kinematic hardening laws.
In this paper, the Bauschinger effect and latent hardening of single crystals are assessed in finite element calculations using a single crystal plasticity model with kinematic hardening. To this end, results of cyclic micro-bending experiments on single crystal Alloy 718 in different crystal orientations (single slip and multi slip) with respect to the loading direction are used to determine the slip system related material properties of the single crystal plasticity model. Two kinematic hardening laws are considered: a kinematic hardening law describing latent hardening and a kinematic hardening law without latent hardening. For the determination of material properties for both hardening laws, a gradient-based optimization method is used. The results show that the different strength levels observed for micro-bending tests on different crystal orientations can only be described with latent kinematic hardening well, whereas the pronounced Bauschinger effect is described well by both kinematic hardening laws. It is concluded that cyclic micro-bending experiments on single crystals using different crystal orientations give an appropriate data base for the determination of the slip system related material properties of the single crystal plasticity model with latent kinematic hardening.
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