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Bainite
*** Shopping-Tip: Bainite
{{Template:Steels}}
Image:Phase diag iron carbon.PNG thumb|right|250px|Iron-carbon [[phase diagram, showing the
eutectoid temperature and composition, at which bainite can form.]]
'''Bainite''' is a mostly
metallic substance that exists in
steel after certain
heat treatments. First described by
Davenport ES Davenport E. S. and
Edgar Bain, it forms when
austenite (a solution of
carbon in
iron) is rapidly cooled past a critical temperature of 1333°F (about 723°C).
A fine non-lamellar structure, bainite commonly consists of
ferrite and
cementite. It is similar in constitution to
pearlite, but with the ferrite forming by a displacive mechanism similar to
martensite formation, followed by precipitation of carbides from the supersaturated ferrite or austenite.
When formed during continuously cooling, the cooling rate to form bainite is higher than that required to form pearlite, but lower than that to form martensite, in steel of the same composition.
Bainite is generally stronger and more
ductility ductile than pearlite.
External link
-
Free online textbook devoted to bainite, from
Cambridge University Press and the
Institute of Materials
{{alloy-stub}}
Category:Metallurgy
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