In recent years, attempts of engineering the surface of duplex stainless steels were made in order to improve their hardness and tribological properties, without affecting their corrosion resistance. A possibility of improving these properties is provided by a family of processes developed by Prof. B.H. Kolster in the Netherlands in the late 1980's. These processes (the Kolsterising® treatments) consist of a low temperature carburizing, which involves the diffusion of large quantities of carbon atoms (up to 6-7% weight rate) into the steel at a diffusion temperature below 450 °C. In the present paper a characterization of the surface layer of Kolsterised duplex SAF 2205 stainless steel was carried out to study the effects of this treatment on surface properties. The characterization includes optical metallographic examination, microhardness test and SEM investigation on the Kolsterised steel in the as treated condition and after annealing treatments at 200, 250, 300 350 and 400°C for 10 hours, to evaluate the stability of Kolsterised layer???s properties with a moderate increase in temperature. Moreover, complying with ASTM G48-03 Method E Standard, in order to evaluate the effect of the Kolsterising® treatment on steel pitting resistance, the critical pitting temperature was obtained for Kolsterised duplex SAF 2205 stainless steel compared with the base metal.

Effect of kolsterising treatment on surface properties of a duplex stainless steel

FACCOLI, Michela
;
CORNACCHIA, Giovanna;ROBERTI, Roberto;
2011-01-01

Abstract

In recent years, attempts of engineering the surface of duplex stainless steels were made in order to improve their hardness and tribological properties, without affecting their corrosion resistance. A possibility of improving these properties is provided by a family of processes developed by Prof. B.H. Kolster in the Netherlands in the late 1980's. These processes (the Kolsterising® treatments) consist of a low temperature carburizing, which involves the diffusion of large quantities of carbon atoms (up to 6-7% weight rate) into the steel at a diffusion temperature below 450 °C. In the present paper a characterization of the surface layer of Kolsterised duplex SAF 2205 stainless steel was carried out to study the effects of this treatment on surface properties. The characterization includes optical metallographic examination, microhardness test and SEM investigation on the Kolsterised steel in the as treated condition and after annealing treatments at 200, 250, 300 350 and 400°C for 10 hours, to evaluate the stability of Kolsterised layer???s properties with a moderate increase in temperature. Moreover, complying with ASTM G48-03 Method E Standard, in order to evaluate the effect of the Kolsterising® treatment on steel pitting resistance, the critical pitting temperature was obtained for Kolsterised duplex SAF 2205 stainless steel compared with the base metal.
2011
9788885298842
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11379/95913
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