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1 Archives of Materials Science and Engineering

1 2008

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Innovative PM duplex stainless steels obtained basing on the Schaeffler diagram

Dobrzański L., Brytan Z., Actis Grande M., Rosso M.

Archives of Materials Science and Engineering

2008

Vol. 30, nr 1

49-52

Purpose: The purpose of this paper was to describe the sintered duplex stainless steels manufactured in sinterhardening process and its usability in field of stainless steels and moreover using computer software to calculate the powder mix composition. Design/methodology/approach: In presented paper duplex stainless steels were obtained through powder metallurgy starting from austenitic or ferritic base powders by controlled addition of alloying elements powder. In the studies besides the preparation of powder mixes, computer software based on Schaeffler’s diagram was studied. Findings: It has been demonstrated that austenitic-ferritic microstructures with regular arrangement of both phases and absence of precipitates can be obtained with properly designed powder mix composition and sintering cycle. Research limitations/implications: According to the alloys characteristic applied cooling rate and powder mix composition seems to be a good compromise to obtain balanced duplex stainless steel microstructures, nevertheless further tests should be carried out in order to examine different cooling rates and sintering parameters. Practical implications: Applied producing method of sintered duplex steels and used sintering cycle as well as developed computer software to calculating powder mix composition proves his advantage in case of obtained microstructures and additionally it seem to be very promising for obtaining a balanced duplex structure, also working with cycles easy to be introduced in industries. Originality/value: The utilization of sinter-hardening process combined with use of elemental powders added to a stainless steel base powder shows its advantages in terms of good microstructural homogeneity and especially working with cycles possible to introduce in industrial practice.