Fe-base alloys in CH₄/H₂ carburizing gas mixtures

Author: Yin, Ruchuan

Source: Materials at High Temperatures, Volume 21, Number 4, November 2004 , pp. 205-211(7)

Publisher: Science Reviews 2000 Ltd

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Abstract:

This study involved cyclic carburization exposures of three Fe-base alloys (310SS, 800HT, and 556) at 800°C in 2% CH₄/H₂ and at 1,100°C in 10% CH₄/H₂ carburizing gas mixtures for 500h. Carburization thermodynamics, kinetics, and carburization behavior are discussed. The exposure at 800°C in 2% CH₄/H₂ was mixed oxidizing/carburizing, but reducing carburizing at 1,100°C in 10% CH₄/H₂. At 800°C Fe-base alloys suffered external carburization and oxidation, and the external Cr-rich scale layers were continuous consisting of oxides and carbides. Carburization resistance primarily depends on the protection afforded by external continuous layers rather than Ni content. At 1,100°C, extensive external carburization occurred, and external layers became discontinuous consisting of Cr/Fe-carbides or metallic CrFe phases. Carburization resistance depends greatly on Ni (Co) content.

Keywords: Fe-base alloy; arburization; carbide; reducing carburizing

Document Type: Research article

DOI: http://dx.doi.org/10.3184/096034004782748666

Affiliations: 1: Materials and Corrosion Section, Sabic Technology Center, P.O. Box # 11669, Jubail Industrial City 31961, Saudi Arabia. ; yinruchuan@yahoo.com, Email: ruchuany@sabic.com

Publication date: 2004-11-15

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Materials at High Temperatures serves the needs of those who develop and use materials for high temperature applications. It publishes peer reviewed contributions relating to high temperature applications in the power, chemical, engine, processing and furnace industries.
The effects of high temperatures on corrosion, fatigue, creep, strength and wear in alloys, intermetallics, ceramics, refractories and composites are covered. Papers dealing with aspects of materials usage including modelling of behaviour and life prediction will be particularly welcome. The journal has a policy of emphasizing practical aspects and authors presenting results from research programmes are encouraged to relate these, if possible, to actual or potential applications.
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