Preliminary communication

Characteristics of low nickel ferritic-austenitic corrosion resistant cast steel

B. Kalandyk ; AGH University of Science and Technology, Krakow, Poland
R. Zapała ; AGH University of Science and Technology, Krakow, Poland
S. Sobula ; AGH University of Science and Technology, Krakow, Poland
M. Górny ; AGH University of Science and Technology, Krakow, Poland
L. Boroń ; Foundry Research Institute, Krakow, Poland

Abstract

The article presents the results of microscopic examinations of corrosion resistant cast steel with reduced nickel content obtained in a test casting with varying wall thickness. Investigations were carried out in as-cast condition and after heat treatment. Regardless of the casting wall thickness, increasing the manganese and nitrogen content to about 5 % and 2 500 ppm, respectively, yields the material with a two-phase microstructure containing ferrite in an amount of 55,6 ÷ 57,2 % (magnetic method) and 52,3 ÷ 55,2 % (analytical method). Based on the results of metallographic examinations, total elimination of the secondary austenite from the microstructure was observed. Microhardness measurements showed average values of 352,3 μHV₂₀ and 267 μHV₂₀ for the chromium ferrite and austenite, respectively.

Keywords

duplex stainless cast steels; microstructure; nitrogen; mechanical properties

Hrčak ID:

122203

URI

https://hrcak.srce.hr/122203

Publication date:

1.10.2014.

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