Effect of microstructure on the fatigue strength of an austempered ductile iron

Rotating bending fatigue tests were carried out on austempered ductile iron containing 1.5 wt.% nickel and 0.3 wt.% molybdenum. The ductile iron was austenitized at 900 or 1050 deg C and then austempered at 280 or 400 deg C for different lengths of time to obtain different microstructures. The fatig...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials science 1994-09, Vol.29 (18), p.4933-4940
Main Authors: Shanmugam, P., Prasad Rao, P., Rajendra Udupa, K., Venkataraman, N.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Rotating bending fatigue tests were carried out on austempered ductile iron containing 1.5 wt.% nickel and 0.3 wt.% molybdenum. The ductile iron was austenitized at 900 or 1050 deg C and then austempered at 280 or 400 deg C for different lengths of time to obtain different microstructures. The fatigue strength was correlated with the amount of retained austenite and its carbon content, which were both determined by x-ray diffraction. While the tensile strength decreased with increasing retained austenite content, the fatigue strength was found to increase. Carbide precipitation was found to be detrimental to fatigue strength. Lower austenitizing temperature resulted in better fatigue strength.
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00356546