Author： Franklin P. Davies B. L.
Publisher： Maney Publishing
ISSN： 1743-2901
Source： Powder Metallurgy, Vol.21, Iss.1, 1978-01, pp. : 7-12
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Abstract
Fatigue fractures of sintered iron have been examined using optical and scanning electron microscopy techniques. Fatigue specimens, machined from sintered rectangular blocks of ROSPL MP32 iron powder at a density of 6·9 Mg m−3, were tested in rotating bending at 50 Hz. Fatigue striae, dimple-type ductile fractures, and shear fractures were all observed in single areas of local fracture and macrocracks propagated predominantly in an in-tergranular fashion. No evidence of slip band formation was observed. The characteristics of fractures produced under static test conditions are compared with those produced by cyclic stressing and a model for fatigue crack propagation in sintered metals is proposed.
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