Abnormal orientation relation between fcc and hcp structures revealed in a deformed high manganese steel

doi:10.1016/j.jmst.2020.07.003

Abstract

Abstract:

The crystallography of phase transformation is an important issue for studying metallic alloys. Here, we demonstrate an abnormal orientation relation between face-centered cubic (fcc) and hexagonal close-packed (hcp) phases due to the intersection of two ε_hcp-martensite variants in a high manganese steel. The corresponding crystallographic characteristics, including invariant line, habit plane and atomic steps, have been characterized by transmission electron microscopy and the quasi-O-line model. In addition, the models of phase transformation about the intersection are proposed based on transmission mechanisms of dislocations. Our findings enrich the theories of phase transformation and implicate the possibility to fabricate stronger and tougher steel.

Key words: Phase transformation, Invariant line, Habit plane, Interface, High-manganese steels

Pan Xie, Shucheng Shen, Cuilan Wu, Jianghua Chen. Abnormal orientation relation between fcc and hcp structures revealed in a deformed high manganese steel[J]. J. Mater. Sci. Technol., 2021, 60: 156-161.

Figures/Tables 7

Fig. 1. (a) TEM images showing the intersection of two εhcp variants viewed from the zone axis [-110]γ // [2-1-10]ε; (b-d) are corresponding diffraction patterns of the areas marked by the circles “b”, “c” and “d” in (a), respectively; (e) stereographic projection of crystal indices showing orientation relationships of multi-phases.

Fig. 2. (a) HRTEM image of intersection of two εhcp variants; (b, c) are magnified images of areas marked by “b” and “c” in (a), respectively.

Table 1 Results of the calculated invariant lines and habit planes in comparison with the experimental results corresponding to the special OR in Fig. 1.

Basis	γ	ε
Invariant line	$\left[ {\overline {3.2} 1\bar 1} \right]$	[12$\overline {4.96}$]
Calculated habit plane	$(\bar 1\overline {1.58} 1.58)$	(02.491)
	∠11.3°∧$(\bar 1\bar 11){\text{\gamma }}$	∠77.9°∧(002)ε
Experimental habit plane	∠10.7°∧$(\bar 1\bar 11){\text{\gamma }}$	∠80°∧(002)ε
Difference	～0.6°	～2.1°

Table 2 Geometric orientation relationship analysis for different slip modes (m' = cosψ · cosκ).

Fig. 3. An extended superimposed pattern of reciprocal points in the zone axes of [0 1 1]γ and [2-1-10]ε according to the quasi-O-line OR similar to the special OR in our experiment.

Fig. 4. HRTEM image showing steps formed between εhcp-martensite and γR-austenite on atomic scale. Note that the habit plane trace is indicated by green dot-dashed line.

Fig. 5. Schematic representation of phase transformation models in the austenitic matrix based on transmission mechanisms of dislocations. Green arrows indicate the directions of dislocation glide.

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