There is extensive work on the fracture of steel with ferrite and
austenite structure, but little on fracture behaviour of ADI, whose
microstructure also comprises austenite and ferrite. The present
work is aimed in this direction. The role of austempering
tempeature on the fracture behaviour of Ni-Mo austempered ductile
iron has been studied. In present work, the fractographic and
fractomicrographic features of the fractured specimens austempered
at 270, 330, 380 C for 1 hr and broken in tensile test and impact
test, respectively, have been studied. The matrix of ADI is a
complex mixture of austenite, bainitic ferrite needles with or
without carbide particle depends upon the austempering temperature.
The matrix of ADI can withstand a certain amount of deformation
before fracture during tensile or impact testing, however the
graphite nodules in the matrix cannot deform and hence are barrier
to matrix deformation and give rise to crack initiation. The crack
propagation is influenced by the orientation of bainitic ferrite
with respect to load direction, also by the presence of carbide
particles inside the needles. Thus producing characteristic
features."
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