To Study the Effect of Austempering Temperature on Fracture Behaviour of Ni-Mo Austempered Ductile Iron (ADI)

Vikas Chawla, Uma Batra, D. Puri, Amita Chawla

Chemistry Department, Govt. Brijindra College. Faridkot, Punjab, India.
Mechanical Engineering Department, L.L.R.I.E.T, Moga, Punjab, India.
Metallurgical & Materials Engineering, I.I.T. Roorkee, India.
Metallurgy Department, P.E.C, Chandigarh, India.

DOI: 10.4236/jmmce.2008.74024                

Abstract

Austempered Ductile Iron (ADI) can be as twice as strong as standard spheroidal iron at the same level of toughness. It responds to work-hardening surface treatments and exhibits excellent fatigue and wear property. There is extensive work done on the fracture of steel with ferrite or/and austenite structure, but little on fracture behaviour of ADI whose microstructure also comprises austenite and ferrite but with graphite nodules in the matrix. The present work is aimed in this direction. The fracture behavior of Ni-Mo ADI is studied. It is found that the crack always originates from graphite nodules and the matrix affects the propagation path.

Keywords

Austempered ductile iron (ADI), Fractography, Dimpled structure, Fracture, Fracture mode.

Conflicts of Interest

The authors declare no conflicts of interest.

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