PSI - Issue 28

Jesús Toribio et al. / Procedia Structural Integrity 28 (2020) 2432–2437 Jesús Toribio / Procedia Structural Integrity 00 (2020) 000–000

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4. Micro-fracture maps (MFMs) in notch-induced fracture of cold drawn pearlitic steel in hydrogen Fig. 4 (Toribio and Vergara, 2020) shows micro-fracture maps (MFMs) in blunt-notch samples of progressively cold-drawn pearlitic steel in hydrogen. The microscopic modes of fracture are tearing topography surface (TTS), micro-void coalescence (MVC), cleavage (C). The TTS zone represents the hydrogen-assisted micro-damage region.

Fig. 4. Fracture surfaces and their respective schemes for different types of MFM: (a) type I; (b) type II; (c) type III; (d) type IV.

5. Micro-fracture maps (MFMs) in notch-induced fracture of 316L austenitic stainless steel in hydrogen Fig. 5 (Toribio and Ayaso, 2020) shows micro-fracture maps (MFMs) in sharply notched samples (shallow notch) of 316L austenitic stainless steel in hydrogen ( long test ), showing evidence of hydrogen-assisted micro-damage in the form of a multi-cracked external ring where multi-cracking is extended in volume.

Fig. 5. Micro-fracture maps (MFMs) in notch-induced fracture of 316L austenitic stainless steel ( shallow sharp notch ).