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Title: Crystal plasticity finite-element simulation on development of dislocation structures in BCC ferritic single crystals
Authors: Hama, Takayuki  kyouindb  KAKEN_id
Kojima, Keisuke
Kubo, Masahiro
Fujimoto, Hitoshi  kyouindb  KAKEN_id  orcid (unconfirmed)
Takuda, Hirohiko  kyouindb  KAKEN_id
Author's alias: 濵, 孝之
久保, 雅寛
藤本, 仁
宅田, 裕彦
Keywords: ferritic single crystal
crystal plasticity finite-element method
dislocation structure
work-hardening behavior
body-centered cubic metal
Issue Date: May-2017
Publisher: Iron and Steel Institute of Japan
Journal title: ISIJ International
Volume: 57
Issue: 5
Start page: 866
End page: 874
Abstract: The role of {112} slip activity on the deformation of bcc ferritic single crystals with different crystallographic orientations was studied numerically using a crystal plasticity finite-element method. Peeters model [Peeters et al., Acta Mater., 49 (2001), 1607] was utilized to predict development of dislocation structures as well as work-hardening behavior. To examine the effect of the {112} slip activity in detail, the simulation was carried out using original Peeters model in which development of cell-block boundaries (CBBs) along the {112} planes was not taken into account, Peeters model in which development of CBBs along the {112} planes was taken into account (extended-1 model), and Peeters model in which {112} slip activity was not taken into consideration (extended-2 model). The predicted stress-strain curves were in qualitatively good agreement with the experimental results for all cases when the original and extended-1 models were used, whereas two-stage work hardening observed for the crystal with {100} <011> was not predicted when the extended-2 model was used. Concerning development of CBBs, the extended-1 and extended-2 models gave better prediction as compared to the original model. The abovementioned results suggested that the extended-1 model gave the most appropriate predictions among the models in terms of work-hardening behavior and development of CBBs, showing that it was more reasonable to take into account both {110} and {112} slip systems and development of CBBs along not only the {110} planes but also the {112} planes.
Rights: © 2017 by The Iron and Steel Institute of Japan
Publisher permitted to deposit this paper on this repository.
DOI(Published Version): 10.2355/isijinternational.ISIJINT-2017-011
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