The influence of copper on the microstructure and selected parameters of duplex cast steel

• Autorzy: Stradomska J. , Stachura S. , Stradomski Z. , Soiński M. S.
• Języki publikacji: EN

Abstrakty

EN

Technological problems related to mastering the production of castings made of ferritic-austenitic cast steel (duplex type), i.e problems related to low carbon content (Cmax 0.03%) and high hot cracking susceptibility due to phenomena taking place during solidification and cooling of castings, cause that this material, although attractive due to its price and improving company prestige, is rarely produced in Poland. The undertaken attempts have mainly dealt with GX2CrNiMoCu25-6-3-3 grade containing copper due to the requirements of power industry which is the main possible customer with respect to the elements made of duplex cast steel. The authors of this paper have thought it reasonable to present selected aspects of microstructural and mechanical properties for the two cast steel grades described in the PN-EN 10283:2002 Standard, which differ only by Cu addition. The examinations concerned mainly the as-cast condition, because it is decisive for the defective production. It has been shown that the weak austenite-forming copper exerts a strong influence on the primary structure of cast steel, resulting in precipitating the [...] austenite within ferrite, where the austenite is crystallographically dependent on the matrix. The GX2CrNiMoCu25-6-3-3 cast steel in supersaturated state is characterised by Charpy V-notch impact energy lower by about 30% than for the cast steel grade without Cu addition.

Słowa kluczowe

EN

innovative; foundry materials; foundry technologies; duplex cast steel; solidification; segregation; mechanical properties

PL

innowacyjność; materiał odlewniczy; technologia odlewnicza; staliwo typu duplex; krzepnięcie; segregacja; właściwości mechaniczne

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2009
• Tom: Vol. 9, iss. 1
• Strony: 87--90
• Opis fizyczny: Bibliogr. 16 poz., rys., tab., wykr.

Twórcy

autor

Stradomska J.

autor

Stachura S.

autor

Stradomski Z.

autor

Soiński M. S.

• Chair of Foundry, Technical University of Częstochowa, av. Armii Krajowej 19, Częstochowa, Poland,,

Bibliografia

• [1] I. M. Hannah, S. Paterson, Reducing risk of hydrogen induced stress cracking (HISC) in duplex stainless steel for subsea application, Duplex 2007 Conference, Stainless Steel World, Grado, Italy.
• [2] A. Tuomi, A. Lofstrand, M. Harju, Increased usage of duplex materials in manufacturing of pulping equipment, Duplex America 2000, Conference Stainless Steel World, 401-407.
• [3] K. A. Johansson, O. Strandmyr, G. E. Eie, 25 years with duplex. From Tammeliten to Gjoea, Duplex 2007 Conference, Stainless Steel World, Grado, Italy.
• [4] R. Dos Santos, H. G. Priesmeyer, Control of the solidification morphology I austenitic-ferritic superduplex steels, Giessereiforschung, vol. 54, No.2, (2002) 45-55 (in German).
• [5] Z. Stradomski, S. Stachura, D. Dyja, Ferritic-austenitic cast steels-perspective and problems, Hutnik- Wiadomości Hutnicze, vol. LXXIII, No. 6 (2006) 275-27921 (in Polish).
• [6] L. Karlsson, The past, present and future of stainless steels, Stainless Steel World, v. 17, November 2005, 48-55.
• [7] K. Forch, Ch. Gillessen, I.von Hagen, Wesseling: Stainless ferritic-austenitic steels-a group of materials with great development potential, Stahl u. Eisen, No. 4 (1992) 53-62 (in German).
• [8] K. A. Bakken, Cost effective materials selections-what is true?, Stainless Steel World 2005 Conference & Expo Maastricht, Netherlands 18-23.
• [9] Z. Stradomski, D. Dyja, S. Stachura, Technological problem in elaboration of massive casting from duplex cast steel, Stainless Steel World 2005 Conference & Expo, Maastricht, Netherlands 363-368.
• [10] D. Dyja, Z. Stradomski, S. Stachura, Solidification structure of massive castings from duplex cast steel, Archives of Foundry, vol. 5, No 15 (2005) 79.
• [11] Z. Stradomski, D. Dyja, Influence of carbon content on the segregation processes in duplex cast steel Archives of Foundry, vol. 7,(2007), Issue 1, January-March, 269÷272.
• [12] J. Głownia D. Szczypkowsli, B. Kalandyk, J. Górniok, S. Sobula, Low-carbon ferritic-austenitic (F-A) cast steels for pump castings, Foundry Journal. 12/2008, 616-621(in Polish).
• [13] G. Lothongkum, P. Wongpanya, S. Morito, T. Furuhara, T. Maki, Effect of nitrogen on corrosion behavior of 28Cr - duplex and microduplex stainless steels in air- 3.5wt% NaCl solution, Corrosion Science, vol. 48 (2006) 137-153.
• [14] M. Gajewski, Precipitate strengthening highly alloyed Cr-Ni-Cu cast steels, Inżynieria Materiałowa, No. 2 (1988) 35-41.
• [15] J. Głownia, B. Kalandyk, K. Hübner, Delta ferrite predictions for cast duplex steels with high nitrogen content, Materials Characterization 47 (2001) 149-155.
• [16] M. Gajewski, Corrosive and erosive resistance precipitate strengthening cast steel, Archives of Foundry, No.1 (2000) 16-21 (in Polish).