The role of Ti, Zr and Ce in shaping of the Cr-Ni-Nb cast steel resistance to carburising

• Autorzy: Tęcza, G. , Zapała, R. , Kawalec, M.
• Języki publikacji: EN

Abstrakty

PL

From the centrifugally cast Cr-Ni-Nb steel pipes, specimens were cut out and subjected to carburising for 100 hours in a mixture of charcoal (90%) and Na₂CO₃ (10%) at the temperatures of 950 and 1150°C. The specimens were cut in direction normal to the pipe axis and were examined by optical and scanning microscopy. As a parameter describing the resistance of the examined alloy to the carburising effect, the thickness of a carburised layer was accepted. It has been observed that additions of Ti and Zr, and of Ti+Zr+Ce introduced jointly, increase the thickness of the carburised layer, while the addition of Ce improves the alloy resistance to carburising. On the alloy surface, a layer composed of oxides, mainly of chromium, silicon and iron, has been formed. Changes in the chemical composition of the surface layer were examined by scanning microscopy.

Słowa kluczowe

PL

nawęglanie; stal austenityczna; mikrododatki; mikrostruktury

EN

carburisation; austenitic cast steels Cr-Ni; microadditives; microstructures

• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2008
• Tom: Vol. 8, iss. 3s
• Strony: 144--148
• Opis fizyczny: Bibliogr. 11 poz., rys., tab., wykr.

Twórcy

autor

Tęcza, G.

• AGH, Faculty of Foundry Engineering, Department of Cast Alloys and Composites Engineering, Reymonta street 23, 30-059 Cracow, Poland,

autor

Zapała, R.

• AGH, Faculty of Foundry Engineering, Department of Cast Alloys and Composites Engineering, Reymonta street 23, 30-059 Cracow, Poland

autor

Kawalec, M.

• AGH, Faculty of Foundry Engineering, Department of Cast Alloys and Composites Engineering, Reymonta street 23, 30-059 Cracow, Poland

Bibliografia

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• [3] J. Łabanowski, Examination of degradation process of catalytic tubes during exploitation in reformer methane, Wydawnictwo Politechniki Gdańskiej, Gdańsk (2003) (in Polish).
• [4] G. Tęcza, R. Zapała, Technology of production segments of centrifugally tubes of Cr-Ni-Nb cast steels, XXIII Konferencja Naukowa z okazji Święta Odlewnika, Kraków (2004) s.53 – 57 (in Polish).
• [5] M. Kupka, A. Wala A, Effect of carburization on some phisical properties of cast steel used in chemical and petrochemical installation, Ochrona przed Korozją no 6 (1979) 148–151 (in Polish).
• [6] A. Rahmel, H.J. Grabke, W. Steinkusch, Carburization – introduction survey, Materials and Corrosion 49 (1998) 221-225.
• [7] T. Shinohara, I. Kohchi, K. Shibata, J. Sugitani, K. Tsuchida, Development of nondestructive technique for measuring carburization thickness and of a new carburization-resistant alloy, Werkstoffe und Korrosion, no 37 (1986), 410-418.
• [8] G. Palasantzas, H. J. Kooij, J. Th. M. De Hosson, Carbon induced metal dusting of iron-nickel-chromium alloy surfaces: a scanning auger microscopy study, Applied Surface Science no 229 (2004) 190-196.
• [9] D. J. Tillack, J. E. Guthrie, Wrought and Cast Heat-Resistant Stainless Steels and Nickel Alloys for the Refining and petrochemical Industries, NiDI Technical Series, No. 10071 (1998).
• [10] D.R.G Mitchell, D.J. Young, W. Kleemann, Carburisation of heat-resistant steel, Materials and Corrosion no 49 (1998) 231-236.