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...