Issue 74

M. C. Marinelli et alii, Fracture and Structural Integrity, 74 (2025) 129-151; DOI: 10.3221/IGF-ESIS.74.09

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(e) (f) Figure 10: TEM BF microstructure showing dislocation structure of RD samples; zone axis B 111   . BCC: (a) dislocation tangles and wall-like structures at Δε p = 0.1%; (b) slip bands extending across adjacent grains at Δε p = 0.1%; (c) development of well-defined dislocation walls and subgrain formation with curved boundaries indicated by arrows at Δε p = 0.2%; (d) dislocation pinning by cementite particles at Δε p = 0.2%; (e) formation of elongated dislocation cells at Δε p = 0.3%; (f) detail of dislocation cell boundaries

with fine precipitates at Δε p = 0.3%. Dislocation structures in DD samples

At Δε p = 0.1%, the dislocation structures in DD samples (Fig. 11a) closely resemble those observed in RD samples. However, dense dislocation accumulations are observed at specific ferrite grain boundaries. Within the ferrite grains,

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