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A. Trombetta et alii, Fracture and Structural Integrity, 77 (2026) 71-88; DOI: 10.3221/IGF-ESIS.77.06

Figure 4: Microstructures of conditions A: core (a), half radius (b) and surface (c). The ratio between equiaxed and elongated alpha grains increase from core to surface, reflecting hot rolling history and recrystallization when annealing below the β -transus (Etching: Kroll).

Figure 5: Microstructures of conditions A, STA, BA and BSTOA analysed by scanning electron microscopy (SEM).

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