The distribution of intervariant crystallographic planes in a lath martensite using five macroscopic parameters

Heat affected zone microstructures and their influence on toughness in two microalloyed HSLA steels

“…The latter inversely correlated with the distribution of grain boundary energy in a polygonal ferrite, where the {1 1 2} tilt boundaries shows a relatively lesser energy compared with {1 1 0} [18,27]. The present result reveals similar distributions to those recently reported for the lath martensite [19], where the crystallographic constraints associated with the shear transformation (i.e., lath bainite) mainly promotes the {1 1 0} planes during the phase transformation, which may not necessarily be the energetically most favourite configuration.…”

“…Three of these refer to the misorientation of the adjacent crystal lattices and the other two define the plane of the lath boundary. This method has addressed various fundamental aspects of grain boundaries in metals and ceramics (e.g., [17][18][19][20][21][22]) but the present work is perhaps the first time that it has been applied to a notable technological problem. Details of the EBSD maps are summarised in Table 2 for all conditions.…”

The Role of Thermomechanical Routes on the Distribution of Grain Boundary and Interface Plane Orientations in Transformed Microstructures

“…Here, the typical c-fiber texture was observed having a texture strength of~12 MRD (Figure 4(c)). It has been [3], [5], and [6], respectively.…”

“…It was recently found that the grain boundary network is largely controlled by the phase transformation mechanism constraints rather than the relative energies of the interfaces. [3,4] The purpose of this paper is to review and compare the grain boundary character distributions of four microstructures processed in different ways. These distributions have been previously reported in different contexts, [3,5,6] but here we focus on the role of the transformation path on the grain boundary character distribution.…”

Five-Parameter Grain Boundary Determination in Annealed Ferrite Structure Using Electron Backscatter Diffraction and Serial Sectioning Technique

“…Thus, five parameters are required for macroscopic description of the grain boundary-three parameters associated with rotational alignment of unit cells of adjacent grains, and two parameters [azimuth (c) and polar angles (b)] for defining the grain boundary plane inclination [4][5][6]. In 9Cr-1Mo steel, the tempered martensite type microstructure utilized for service applications exhibit complex heterogeneous structure, fine crystallites and high defect density [7], whereas the intermediate polygonal ferrite microstructure exhibit good formability required in fabrication of components. The present study reports the characterization of 5-parameter Grain Boundary Character Distribution (GBCD) in a polygonal ferrite microstructure of 9Cr-1Mo steel (obtained by diffusional phase transformation).…”