Morphological stability of [gamma]/[alpha] interface formed by carburization in Fe-C-X alloys

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

OSTI ID:7284354

Ichinose, M; Ishida, K; Nishizawa, T ^[1]; Togashi, F ^[2]

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1. Tohoku Univ., Sendai (Japan)
2. Kawasaki Steel Co. Ltd., Chiba (Japan). Technical Research Center

Effect of alloying elements on the morphological stability of austenite/ferrite interface formed by carburization of Fe-X alloys at 850 C and 800 C was investigated. Planar interfaces were found when the alloying elements added were from among the following: Ti, V, Nb, Ta, Cr, Mo, W, Co, and Cu. Nonplanar interfaces with Widmanstaetten-like structures and/or an isolated phase were observed when the alloying elements were from the following group: P, Al, Sb, Ni, Mn, Si, and Ge. The degree of supersaturation of C in the [alpha] phase adjacent to the [gamma] phase front was analyzed using the concept of local equilibrium. It was confirmed that there was indeed a close correlation between the morphological stability and the degree of C supersaturation, which in itself depended on whether the alloying element added was an [alpha] or [gamma] stabilizer and how strongly it bonded with C in the ferrite phase.

• OSTI ID: 7284354
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 25:3; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM
ANTIMONY
AUSTENITE
CARBON
CARBON ADDITIONS
CHROMIUM
COBALT
COPPER
ELEMENTS
FERRITE
GERMANIUM
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
MOLYBDENUM
NICKEL
NIOBIUM
NONMETALS
PHASE STUDIES
PHOSPHORUS
SEMIMETALS
SILICON
STABILITY
TANTALUM
TITANIUM
TRANSITION ELEMENTS
TUNGSTEN
VANADIUM