________
is obtained by isothermal hardening operation.
Cementite
Sorbite
Acicular troostite
Bainite
Bainite
Bainite
is form by isothermal hardening method, which is called as austempering.
Hence, the correct option is (D).
&Key Points:-
●Austempering
is heat treatment that is applied to ferrous metals, most notably steel and
ductile iron.
●In
steel, it produces a bainite microstructure whereas in cast irons, it produces
a structure of a circular ferrite and high carbon.
●Austempering is shown in TTT diagram
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