High-temperature corrosion and creep of Ni-Cr-Fe alloys in carburizing and oxidizing environments

Journal Article · Sun Oct 01 04:00:00 EDT 1978 · Oxid. Met.; (United States)

DOI:https://doi.org/10.1007/BF00612086· OSTI ID:6427506

Schnaas, A; Grabke, H J

The carburization of NiCr 32 20 and NiCrSi 60 16 has been studied in CH/sub 4/-H/sub 2/ mixtures in the temperature range 900-1100/sup 0/C. The methods included thermogravimetric measurements and studies on reacted specimens by X-ray diffraction, metallographic, and chemical analysis. Upon carburization internal carbides M/sub 7/C/sub 3/ and M/sub 23/C/sub 6/ are formed (M = mainly Cr); the rate of carburization is determined by carbon diffusion in the Fe-Ni matrix with carbide precipitations. The effect of the alloying elements Ni and Si on the carburization resistance of austenitic alloys is explained. By the same methods the oxidation and carburization in CO-H/sub 2/O-H/sub 2/ mixtures have been studied. The important role of a stable chromium oxide layer for the carburization resistance was confirmed. Creep tests at 1000/sup 0/C in a CO-H/sub 2/O-H/sub 2/ atmosphere where Cr/sub 2/O/sub 3/ is stable showed carburization occurring through cracks in the oxide layer. At high strain rates premature failure occurs by carburization, which is followed by internal oxidation and formation of cracks, voids, and holes.

• Research Organization: Max-Planck-Inst. fuer Eisenforschung, Duesseldorf, Germany
• OSTI ID: 6427506
• Journal Information: Oxid. Met.; (United States), Journal Name: Oxid. Met.; (United States) Vol. 12:5; ISSN OXMEA
• Country of Publication: United States
• Language: English

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