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Materials
/ ADI
ADI (Austempered Ductile
Iron) is the term used for a group of cast iron
materials which are heat treated to produce a special
microstructure. This structure is comprised of austenite
and needle-shaped ferrite and is referred to as
“ausferrite”. Another commonly used
term is “quench tempered cast iron”.
In earlier literature this structure was also frequently
called “bainitic cast iron”.
The profile of properties of the tough grades of
ADI make them suitable for applications which used
to be the reserve of forged steels. However, the
density of ADI is approximately 10% less than that
of steel because of its high graphite content, which
makes this group of materials an attractive alternative
for light-weight constructions. In addition, the
material also has outstanding damping capacity,
thanks to the graphite and the ausferritic matrix,
which is a particular advantage for many applications,
e.g. for transmissions.
The high-tensile grades are used mainly for applications
where good resistance to wear is required, such
as is in soil cultivation machinery used in agriculture
or in mining applications. Here they provide an
alternative to manganese steel and high-alloy, white
cast iron. ADI is often a more economical solution
than these materials.
For even greater resistance to wear, hard carbides
can also be added. The group known as carbidic ADI
materials (CADI) is not currently covered by any
standards.
Techn.
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