Crystal Plasticity Finite-element Simulation on Development of Dislocation Structures in BCC Ferritic Single Crystals

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.KEY WORDS: ferritic single crystal; crystal plasticity finite-element method; dislocation structure; workhardening behavior; body-centered cubic metal.

Influence of Strain Ratio on Surface Roughening in Biaxial Stretching of IF Steel Sheets

“…24) The reference-strain rate and the rate-sensitivity parameter were taken to be  γ 0 = 0.002/s and m = 0.02, respectively. Please refer to our previous studies 26,27) for details of the model.…”

“…In the simulation, the representative volume element was an eight-node solid element with selective reduced integration. 27) The same crystallographic orientation was embedded into all eight integration points. The simulation procedures are detailed in the literature.…”

“…The simulation procedures are detailed in the literature. 27) Because the preparation of the materials followed the literature, 24) the material parameters reported in the literature were also employed in the present study. Figure 9 shows the comparison between the measured and simulated stress-strain relationships for the three types of specimens shown in Table 2.…”

“…Furthermore, the influence of the distribution of crystal orientations on the surface roughness development was numerically examined using a crystal plasticity finite-element analysis (CPFEA). [24][25][26][27]…”

Crystal Plasticity Modeling for Non-ferrous Metals and its Engineering Applications

“…Thereafter, due to the improvements in computational power, crystal plasticity modeling, and simulation technique, the number of studies on quantitative prediction of macroscopic deformation behavior, including work hardening, contour of equal plastic work, and Lankford values, has recently increased especially for hcp metals; e.g. [12][13][14][15][16][17][18][19][20][21][22] as a result, crystal plasticity models are also drawing attention in industrial applications. Contrary to phenomenological constitutive models, one of the advantages of crystal plasticity models is that they can predict the macroscopic deformation characteristics even if they have not been observed experimentally.…”