Título:
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Effect of thermal treatments on the wear behaviour of duplex stainless steels
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Autor/a:
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Fargas Ribas, Gemma; Mestra Rodríguez, Álvaro Miguel; Anglada Gomila, Marcos Juan; Mateo García, Antonio Manuel
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Otros autores:
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Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Micromecànica i Fiabilitat dels Materials |
Abstract:
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Duplex stainless steel (DSS) is a family of steels characterized by two-phase
microstructure with similar percentages of ferrite (α) and austenite (y).Their attractive
combination of mechanical properties and corrosion resistance has increased its use in last
decades in the marine and petrochemical industries. Nevertheless, an inappropriate heat
treatment can induce the precipitation of secondary phases which affect directly their
mechanical properties and corrosion resistance. There are few works dealing with the influence
of heat treatments on wear behaviour of these steels in the literature. For instances, this paper
aims to determine wear kinetic and sliding wear volume developed as a function of heat
treatment conditions. Therefore, the samples were heat treated from 850 ° C to 975 º C before
sliding wear tests. These wear tests were carried out using ball on disk technique at constant
sliding velocity and different sliding distances. Two methodologies were used to calculate the
wear volume: weight loss and area measurement using a simplified contact model.
Microstructural observations showed the presence of sigma phase for all studied conditions.
The formation kinetics of this phase is faster at 875 ºC and decrease at higher temperatures.
Results related to wear showed that the hardness introduced due to the presence of sigma phase
plays an important role on wear behaviour for this steel. It was observed also that wear rates
decreased when increasing the percentage of sigma phase on the microstructure. |
Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria dels materials::Assaig de materials -Stainless steel -Materials--Testing -Acer inoxidable -Assaigs de materials |
Derechos:
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Tipo de documento:
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Artículo - Versión publicada Artículo |
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