EBSD characterization of dynamic shear band regions in pre-shocked and as-received 304 stainless steels

Microstructural Evolution during the Dynamic Deformation of High Strength Navy Steels

“…Reviews on the subject by Murr [9,10], and other research articles [11][12][13][14][15][16][17][18][19] extensively discuss the origin and underlying mechanisms. Transmission Electron Microscopy (TEM) has been commonly employed to characterize the microstructures of the shear bands for many years, although the narrow dimensions of the shear band width makes the TEM investigation difficult, because specimen perforation generated by ordinary chemical thinning and ion-milling often does not coincide with the band area.…”

“…The technique allows a direct quantitative analysis of the subgrains and substructures as small as 0.2 tm, and permits measurements of subgrain/substructure size, misorientation and the distribution of boundary orientation. Xue and Perez-Prado used EBSD to examine microstructural evolution in the shear bands generated using high-strain rates in 304 stainless steel [ 18] and Ta, and Ta-W alloys [19]. Xue et al found large intragranular misorientation gradients in the shear bands, and employed Taylor factor and misorientation analyses to explain the deformation mechanism [18].…”

“…Xue and Perez-Prado used EBSD to examine microstructural evolution in the shear bands generated using high-strain rates in 304 stainless steel [ 18] and Ta, and Ta-W alloys [19]. Xue et al found large intragranular misorientation gradients in the shear bands, and employed Taylor factor and misorientation analyses to explain the deformation mechanism [18]. Perez-Prado et al have proposed that the microstructural refinement is not due to boundary mobility-based recrystallization processes, but instead could be attributed to lattice rotations associated with shear localization [19].…”

“…Perez-Prado et al have proposed that the microstructural refinement is not due to boundary mobility-based recrystallization processes, but instead could be attributed to lattice rotations associated with shear localization [19]. Kad and Gebert et al have shown that plastic deformation by shear leads to a strong [11][12][13][14][15][16][17][18][19][20] fiber texture prior to the breakup of the existing grain structure [20]. Martinez et al [16] and Lins et al [17] have characterized recrystallization by EBSD in the shear band of Ti-6AI-4V and interstitial free steel respectively.…”

The dynamic response of β titanium alloys to high strain rates at room and elevated temperatures

“…Nasser et al [201] and Meyers et al [106] reached a consensus that in highstrain-rate deformed tantalum, the microstructure changes from the vicinity of shear bands to the Hongyi Zhan 39 The University of Queensland centre of shear bands in the following order; arrays of dislocation lines, dislocation groupings, formation of elongated dislocation cells and subgrains, and recrystallized micro-grains. As TEM can only observe a limited area of microstructure, electron backscatter diffraction (EBSD) has been applied to characterize the microstructure within ASBs in the past decade [202][203][204][205]. A series of EBSD maps of the adiabatic shear bands in Ti-6Al-4V specimens are shown in Figure 22 [204].…”