Journal
MATERIALS CHARACTERIZATION
Volume 45, Issue 3, Pages 211-220Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S1044-5803(00)00080-2
Keywords
powder metallurgy steels; manganese sulphide; fatigue fracture
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This study examined the fatigue fracture morphology and microstructure of two powder metallurgy steels containing 0.0 or 0.5% manganese sulphide (MnS) powder at three density levels: nominal 7.15, 7.45, and full density. Fractography showed that MnS had not participated in fatigue crack initiation or in changing the crack propagation mechanisms. Fatigue crack origins were initiated at pores located at specimen surfaces (7.15 and 7.45 materials), or at subsurface hard inclusions (full density materials). Fatigue crack growth occulted by transparticle serrated and striated mechanisms, by interparticle neck separation from microvoid coalescence, and by transparticle cleavage fracture. (C) 2000 Elsevier Science Inc. All rights reserved.
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