Abstract
The microstructure of an oxide dispersion strengthened ferritic PM2000 steel with a strong initial (100) texture has been investigated after compression by dynamic plastic deformation (DPD) at room temperature to a strain of 2.1. Measurements using electron backscatter diffraction and transmission electron microscopy indicate that DPD along the (100) direction results in a lamellar-type microstructure, in which lamellae of the (100) orientation alternate with (111) lamellae. These lamellae have a common rotation (110) axis in the compression plane. The microstructure is quite heterogeneous, where regions containing very narrow lamellae (with (111) lamellae as narrow as 20-40 nm) and regions of comparatively broad lamellae are found.
Highlights
Structural refinement by plastic deformation has been extensively investigated aiming at developing high-strength materials [1,2]
In materials deformed by slip, significant structural refinement can be achieved due to grain subdivision by dislocation boundaries, for which the boundary spacing decreases with increasing strain, whereas the average misorientation angle and the fraction of high angle boundaries (HABs) increase with increasing strain [2−4]
The {110} pole figure in Fig.1b reveals that the 〈111〉 lamellae share one 110 pole with the 〈100〉 lamellae. This common pole is perpendicular to the compression axis (CA), i.e. the rotation axis between the 〈111〉 and 〈100〉 lamellae is in the compression plane
Summary
Structural refinement by plastic deformation has been extensively investigated aiming at developing high-strength materials [1,2]. In materials deformed by slip, significant structural refinement can be achieved due to grain subdivision by dislocation boundaries, for which the boundary spacing decreases with increasing strain, whereas the average misorientation angle and the fraction of high angle boundaries (HABs) increase with increasing strain [2−4]. For such materials, it has been demonstrated that deformation at high strain rates can further accelerate the process of grain refinement [5].
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