PSI - Issue 60

Vivek Srivastava et al. / Procedia Structural Integrity 60 (2024) 233–244 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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initiate from metallurgical stress concentrations, such as, persistent slip bands, grain boundaries, pores, non-metallic inclusions or particles, which is accelerated by aggressive environment and localized pit formation [2]. Similar fractographic features were observed in our XS steel having YS = 444 MPa, similar to that of X60 steel.

Fig. 8. SEM fractography of FC specimen after CFCGR test with fractographic features: quasi-brittle (QC), inclusions (INC), secondary cracks (SC) and aligning of INC along shear lips (SL) in final fracture region

Fig. 9. SEM-EDS analysis of fractured surface showing the presence of sulfide and aluminium oxide inclusions