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Kinetics of the σ Phase Precipitation in Respect of Erosion-corrosion Wear of Duplex Cast Steel

Brodziak-Hyska A., Stradomski Z., Kolan C.

Archives of Foundry Engineering

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2014

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Vol. 14, iss. 1

17--20

EN

The examined material comprised two grades of corrosion-resistant cast steel, namely GX2CrNiMoN25-6-3 and GX2CrNiMoCuN25-6-3-3, used for example in elements of systems of wet flue gas desulphurisation in power industry. The operating conditions in media heated up to 70°C and containing Cl- and SO4 ions and solid particles produce high erosive and corrosive wear. The work proposes an application of the σ phase as a component of precipitation strengthening mechanism in order to increase the functional properties of the material. The paper presents the results of examination of the kinetics of σ phase precipitation at a temperature of 800°C and at times ranging from 30 to 180 minutes. Changes in the morphology of precipitates of the σ phase were determined using the value of shape factor R. Resistance to erosion-corrosion wear of duplex cast steel was correlated with the kinetics of sigma phase precipitating.

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The influence of sigma phase on erosion and corrosion properties of duplex steel

Stradomski Z., Brodziak A.

Archives of Foundry Engineering

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2010

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Vol. 10, iss. 3

85--88

EN

The paper presents the results of investigations concerning the influence of σ phase precipitating on the erosion and corrosion properties of ferritic-austenitic cast steel. The object of investigation have been two grades of corrosion-resistant cast steel: GX2CrNiMoCuN25-6-3-3 and GX2CrNiMoN25-6-3. The examinations have involved measurements for obtaining potentiodynamic curves, examination of erosion and corrosion resistance, and microstructural analysis. The supersaturated cast steel and the material after heat treatment have been examined. It has been found that the tribological properties of supersaturated cast steel are worse than those of the supersaturated and annealed cast steel. The highest erosion and corrosion resistance has been achieved as a result of ferrite decomposition δ → γ’+ σ. The examinations of corrosion resistance have revealed that the ageing process after supersaturation do not cause significant changes in the anti-corrosive properties.

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Możliwości zwiększenia odporności na zużycie erozyjne staliwa ferrytyczno-austenitycznego: część 2 - właściwości użytkowe

Stradomski Z., Dyja D., Stachura S., Pirowski Z.

Inżynieria Materiałowa

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2006

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Vol. 27, nr 3

730-732

PL

W pracy przedstawiono możliwości sterowania strukturą staliwa typu duplex w aspekcie własności eksploatacyjnych odlewów. Przeprowadzono badania mikrostruktury staliwa po różnych zabiegach obróbki cieplnej oraz opisano wpływ tych zabiegów na jego własności, zwłaszcza twardość udarność oraz odporność na korozje i zużycie erozyjne. Badania wykazały, że staliwa duplex dają duże możliwości optymalizacji struktury, w zależności od nasilenia destrukcyjnych procesów erozyjno-korozyjnych.

EN

The possibilities of microstructure controlling of the duplex cast steel in the aspect of exploitation properties were shown in this work. Microstructure investigations of the cast steel after various heat treatments were done. Influence of the processes on cast steel properties, especially hardness, impact strength and corrosion and erosion resistance, was shown. The investigations proved that there are large possibilities of microstructure controlling of the duplex cast steel, in the dependence of intensity of destructive corrosion-erosion processes.