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Fractography of fish-eye cracks in nitride steel speci- mens: assessment of residual fatigue life

Slamecka K., Kianicova M., Pokluda J.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2011

z. 99

53-54

An assessment of the residual fatigue life of plasma-nitrided high-strength low-alloy steel specimens subjected to symmetrical in-phase bending-torsion loading has been performed. All specimens failed due to the internal fish-eye type of fracture initiated at non-metallic inclusions within the specimen interior. The deflection of the crack plane from the plane perpendicular to the specimen axis was almost negligible in the radial direction and varied as a function of the loading regime in the tangential direction. In all cases, the crack propagated predominantly under a local mode I loading.