Preliminary communication

Influence of the cooling rate on the corrosion resistance of duplex cast steel

B. Kalandyk ; AGH University of Science and Technology, Krakow, Poland
M. Starowicz ; AGH University of Science and Technology, Krakow, Poland
M. Kawalec ; AGH University of Science and Technology, Krakow, Poland
R. Zapała ; AGH University of Science and Technology, Krakow, Poland

Abstract

The results of the influence of the cooling rate of the casting made of the acid-resistant ferritic - austenitic cast steel on the microstructure and corrosion resistance are presented in the paper. Samples cut out from the walls of the casting being cooled at the cooling rate of 3,2 - 0,5 ºC/s were used in the study. Different cooling rates create favorable conditions for the segregation processes lowering properties of castings. It was found, that differences in the polarization curves occur only in the more aggressive corrosive environment. The reason of such behaviour of cast steel is the segregation of elements dissolved in austenite and the difference in the volume fraction of ferrite and austenite in the walls of the different thickness.

Keywords

electrochemical corrosion; casting; stainless steel; microstructures

Hrčak ID:

86770

URI

https://hrcak.srce.hr/86770

Publication date:

1.1.2013.

Visits: 1.361 *