Enhancement of carburization/oxidation resistance in fossil fuel environments through alloy compositional optimization

Book · Thu Aug 01 04:00:00 EDT 1996

OSTI ID:268215

Baker, B A; Smith, G D; Tassen, C S ^[1]

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1. INCO Alloys International, Inc., Huntington, WV (United States)

Carburization resistance of numerous heat resistant alloys has been evaluated in equilibrated atmospheres having a wide range of oxygen potentials. This paper attempts to characterize and explain alloy performance in these simulated fossil fuel environments on the basis of alloy content and scale characteristics and discusses means of further improvements in performance. A survey of current information regarding scale characteristics of wrought nickel-base alloys is also presented. Typical carburizing service environments contain at least some level of oxygen. Such applications include heat treating, ethylene pyrolysis, coal conversion, activated carbon production and steam hydrocarbon reforming. Carburization usually plays some role in the ultimate failure of an alloy; it often compromises creep and fatigue life and/or ductility. Conversely, creep, fatigue and thermal cycling can cause protective scales to crack and spall, thereby compromising carburization resistance. To maximize carburization resistance in future alloys, attention must be paid not only to corrosion performance in static environments but also to scale-alloy compatibility, growth stresses, creep and thermal gradient stresses, and inward and outward diffusion coefficients, and scale repairability.

• OSTI ID: 268215
• Report Number(s): CONF-960389--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
02 PETROLEUM
36 MATERIALS SCIENCE
ALLOY-HK-40
CARBON DIOXIDE
CARBURIZATION
CHEMICAL REACTORS
CHROMIUM CARBIDES
CONVERSION
CORROSION RESISTANCE
CORROSIVE EFFECTS
EXPERIMENTAL DATA
FOSSIL FUELS
HEAT RESISTING ALLOYS
HYDROGEN
INCOLOY 800
INCONEL 617
INCONEL 625
IRON CARBIDES
METALLURGICAL EFFECTS
METHANE
NICKEL BASE ALLOYS
OXIDATION
PETROLEUM REFINERIES
PROTECTIVE COATINGS
STAINLESS STEEL-310