Optimization of Sigma Phase Precipitates with Respect to the Functional Properties of Duplex Cast Steel

Open access

Optimization of Sigma Phase Precipitates with Respect to the Functional Properties of Duplex Cast Steel

The paper presents the results of examination concerning optimization of the σ phase precipitates with respect to the functional properties of ferritic-austenitic cast steel. 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. Morphology and quantities of σ phase precipitates were determined, as well as its influence on the erosion and corrosion wear resistance. It was shown that annealing at 800°C or 900°C significantly improves tribological properties as compared with the supersaturated state, and the best erosion and corrosion wear resistance achieved due to the ferrite decomposition δ → γ' + σ was exhibited in the case of annealing at the temperature of 800°C for 3 hours.

Johansson K. A., Strandmyr O., Eie G. E. (2007). 25 years with duplex. From Tammeliten to Gjoea, Duplex 2007 Conference, Stainless Steel World, Grado, Italy.

Martins M., Casteletti L. C. (2009). Microstructural characteristics and corrosion behavior of a super duplex stainless steels casting. Materials Characterizations. 60 (2), 150-155.

Cassgne T., Busschaert F. (2007). Experience with duplex stainless steels in oil and gas prodution, Duplex 2007 Conference, Stainless Steel World, Grado, Italy.

Stradomski Z. (2010). Microstructure in the problems of abrasion-resting cast steel wear. Edit. Politechnika Częstochowska (in Polish).

Stradomski Z. (2011). Ferritic-austenitic cast steel-selected problems. Archives of Foundry Engineering. 11 (3), 47-50.

Topolska S., Łabanowski J. (2009). Effect of microstructure on impact toughness of duplex and superduplex stainless steels. Journal of Achievements in Materials and Manufacturing Engineering. 36/2, 142-149.

Brodziak A., Stradomski Z. (2010). Assessment the possibility of enhancing the tribological properties of the ferritic-austenitic cast steel. Archives of Foundry Engineering, 10 (Special Issue 1), 287-290.

Archives of Foundry Engineering

The Journal of Polish Academy of Sciences

Journal Information

CiteScore 2016: 0.42

SCImago Journal Rank (SJR) 2016: 0.192
Source Normalized Impact per Paper (SNIP) 2016: 0.316


All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 70 69 7
PDF Downloads 25 25 4