Multiphase stainless steels are produced for their attractive properties of mechanical strength and corrosion resistance relative to their austenite-ferrite structure. The manufacture of these steel by powder metallurgy technology presents some advantages in terms of low cost and formability of complex shapes. Mechanical and corrosion resistances are not at the level of the wrought steels due to their porous nature. In this work the fatigue and corrosion fatigue behaviour of some sintered steels obtained by sintering from 316L and 434L base powders has been studied for characterisation and comparison. The sintered steels were fatigue tested in two different environments: air and NaCl aqueous solution. The tests performed indicate that the chemical and microstructral composition has no great influence on fatigue behaviour in comparison with the manufacturing technology (sintering). This is most evident in the more aggressive environment, like seawater, in which these steels could be advantageously used. The analysis of fracture surfaces using SEM microscopy shows a peculiar crack propagation characterised by cleavage, stress intensification due to porosity, and features of localised ductility on sintering necks and base powder particles.

Corrosion fatigue characterisation of sintered multiphase stainless steels / Felli, Ferdinando; A., Scicutelli; L., Ippati; L., Fedrizzi; A., Molinari. - In: MATERIALS SCIENCE AND TECHNOLOGY. - ISSN 0267-0836. - 21:6(2005), pp. 641-647. [10.1179/174328405x43162]

Corrosion fatigue characterisation of sintered multiphase stainless steels

FELLI, Ferdinando;
2005

Abstract

Multiphase stainless steels are produced for their attractive properties of mechanical strength and corrosion resistance relative to their austenite-ferrite structure. The manufacture of these steel by powder metallurgy technology presents some advantages in terms of low cost and formability of complex shapes. Mechanical and corrosion resistances are not at the level of the wrought steels due to their porous nature. In this work the fatigue and corrosion fatigue behaviour of some sintered steels obtained by sintering from 316L and 434L base powders has been studied for characterisation and comparison. The sintered steels were fatigue tested in two different environments: air and NaCl aqueous solution. The tests performed indicate that the chemical and microstructral composition has no great influence on fatigue behaviour in comparison with the manufacturing technology (sintering). This is most evident in the more aggressive environment, like seawater, in which these steels could be advantageously used. The analysis of fracture surfaces using SEM microscopy shows a peculiar crack propagation characterised by cleavage, stress intensification due to porosity, and features of localised ductility on sintering necks and base powder particles.
2005
corrosion fatigue; duplex stainless steels; fatigue; multiphase stainless steels; sintered steels
01 Pubblicazione su rivista::01a Articolo in rivista
Corrosion fatigue characterisation of sintered multiphase stainless steels / Felli, Ferdinando; A., Scicutelli; L., Ippati; L., Fedrizzi; A., Molinari. - In: MATERIALS SCIENCE AND TECHNOLOGY. - ISSN 0267-0836. - 21:6(2005), pp. 641-647. [10.1179/174328405x43162]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/13073
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