PSI - Issue 82

S.S.M. Tavares et al. / Procedia Structural Integrity 82 (2026) 192–198 Tavares et al. / Structural Integrity Procedia 00 (2026) 000–000

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Fig. 3. Microstructures: (a) AR-850-15; (b) AR-850-30; (c) ST-850-15; (d) ST-850-30.

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Fig. 4. (a) Microstructure of specimen 1100-SC; (b) Thermal cycle of 1100-SC.

Specimen slowly cooled had 21.8% s and 1.7% c , totaling ~ 23.5% of intermetallic phases. Such a high amount of deleterious phases is easily detected with ferritoscope, and cause hardening and severe embrittlement. The presence of such high amounts of deleterious phases was already found in practice, as described in previous failure analysis works (Smiderle et al., 2014; Tavares et al., 2018). The hardness data show that this property cannot be used to detect deleterious phases. For solution treated and aged