Cyclic oxidation plus carburization of heat-resistant alloys

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Corrosion

DOI:https://doi.org/10.5006/1.3294361· OSTI ID:28022

Harper, M A; Ducasse, M; Young, D J ^[1]

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1. Univ. of New South Wales, Kensington (Australia). School of Materials Science and Engineering

Carburization of iron-nickel-chromium (Fe-Ni-Cr) alloys is observed in several industrial processes, particularly in the production of ethylene from thermal cracking of hydrocarbons. Nine heat-resistant alloys were exposed to cycles of oxidation plus carburization. Each cycle consisted of 4 h of oxidation in air at 700 C followed by 16 h of carburization in hydrogen gas (H{sub 2}) + propylene (C{sub 3}H{sub 6}) at 950 C. The alloys were tested for 1, 3, and 5 cycles, and invariably were found to have undergone internal carburization. The rate of this process was measured with respect to cumulative carburization time, and the kinetics were found to be parabolic. Data from isothermal carburization of the same alloys were compared with rates found in the cyclic process. In general, the internal carburization produced by the 3- and 5-cycle runs was greater than that resulting from isothermal carburization. This was a result of a ``metal dusting`` attack of the alloys and increased carbon activities in their surface regions.

• Sponsoring Organization: USDOE
• OSTI ID: 28022
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 3 Vol. 51; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
AUSTENITIC STEELS
CARBURIZATION
CHEMICAL REACTION KINETICS
HEAT RESISTING ALLOYS
LOW ALLOY STEELS
OXIDATION
PETROLEUM REFINERIES
STAINLESS STEELS