Development of wire drawing textures in Cu–Fe: the influence of macroscopic and microscopic heterogeneities

Abstract

The current paper presents a comparison of the influence over texture development of different heterogeneity levels of deformation. A viscoplastic self-consistent (VPSC) micromechanical model is coupled with a finite element method (FEM) to simulate wire drawing texture development in a two-phase Cu–Fe material. VPSC models are capable of simulating grain-to-grain heterogeneity, and FEM models can accomplish the task of simulating the macroscopic variation of velocity gradient due to geometrical constraints during wire drawing. Intra-grain heterogeneities are empirically built in the VPSC model by enforcing a common spin between closest neighbour grains. The results are contrasted and validated by neutron diffraction experimental textures. Different levels of heterogeneity are simulated, and the results are assessed and compared against Taylor based simulations. The ‘curling’ problem is also addressed by allowing the grains to interact through the co-spin model and the ellipsoid axes orientations to evolve independently.

Effect of Phase Contiguity and Morphology on the Evolution of Deformation Texture in Two-Phase Alloys

“…Various investigations [15][16][17][18][19][20][21][22][23][24][25][26] have employed characterization tools like X-ray, neutron, synchrotron, and electron backscatter diffraction (EBSD) to study texture and microstructure evolution in the individual phases of two-phase materials. Finite element methods and self-consistent simulations [8,[13][14][15][16][17][18][19] have been used to elucidate the deformation behavior of these materials.…”

Spatial correlation in grain misorientation distribution

“…Bolmaro et al [8] and Tomé et al [9] account for the interactions between neighbor grains in a two-sites self-consistent scheme, by enforcing the same lattice reorientation and maintaining the grains' relative misorientation, a condition dubbed "co-rotation" of neighbor grains. Crystal plasticity finite-element-based models dedicated to texture development simulation may account as well for interactions arising from the enforcement of continuity of the elastic spin at grain boundaries [10,11]. Finally the so-called LAMEL model [12][13][14] also accounts for interactions between a grain and its nearest neighbors by assuming continuity of some components of the traction and velocity gradient tensors at grain boundaries.…”

“…However, the continuity conditions proposed in Refs. [8][9][10][11][12][13][14] clearly lack the understanding of the interactions between dislocation content of grain boundaries, internal stresses arising from grain-boundary incompatibility and deformation mechanisms in the neighboring grains.…”

Thermomechanical Simulation and Experimental Validation of Wire Drawing Processes

“…The study of this problem has attracted the attention since the end of the 19th century (see [1][2][3] for a historical review on this subject). In recent years, the analysis of this process has encompassed different topics such as: assessment of the influence of drawing variables (e.g., drawing velocity, die geometry and heat treatment) on the material response [2][3][4][5][6][7][8] comparison of finite element simulations with analytical results [7][8][9], estimation of the back tension in single [10], and multistep [11][12][13] processes, surface and internal (i.e., chevron) crack formation [14][15][16][17][18][19][20], experimental and numerical evaluation of residual stresses [21][22][23][24][25][26][27], hydrodynamics in the lubricant layer [28,29], wear prediction [30,31], computation of temperature distribution on the wire [30,32,33], strain rate effects in high-speed forming [34], and texture development [35].…”

“…The obtained numerical results were found to consistently agree with the corresponding experimental measurements. Finally, Bolmaro et al [35] studied the development of wire drawing textures in a two-phase Cu-Fe material. Simulation results, achieved through a viscoplastic selfconsistent micromechanical model, were contrasted and validated by neutron diffraction experimental textures.…”