An experimental investigation was carried out to study the structure of
ductile iron castings which were selected to perform the investigation: 1.4% Ni
- 0.3 Mo and 2.4% Ni - 0.3 Mo. After austenitizing at 880℃ for 1.3 hr, the two alloys were austempered at 250℃ and 350℃ for time intervals of 60, 120, 240 minutes. Microstructure observation
and measurement of UTS, and adhesive wear resistances were reported as functions
of austempering time. The results also showed that the obtained structure
properties are not believed to be the best possible, but rather they should be
viewed as what can be expected with reasonable controls. Production of a
conventional spare gear from austempered
ductile iron was aimed and concluded at a later stage. The same casting and
treating conditions attributed to the optimum structure properties were used
for production of the gear.
Cite this paper
Rijab, M. A. and Al-Mosawi, A. I. (2014). Effect of Austempering Time on Microstructure and Wear Resistance of Ductile Iron Castings. Open Access Library Journal, 1, e1032. doi: http://dx.doi.org/10.4236/oalib.1101032.
Elliott, R. (2004)
Austempering of an Mn-Mo-Cu Alloyed Ductile Iron Part 1—Austempering Kinetics and Processing Window
Part II. Materials Science and Technology, 12, 233-248.
Gundlach (2006) Monitoring the Bainite Reaction during
Austempering of Ductile Iron and High Silicon Cast Steel by Resistivity
Measurement Part III. AFS Transactions, 32, 17-24.
Young, J.M. (2008) Influence of Austempering
Temperature on the Characteristics of Austempered Ductile Iron Alloyed with Cu
and Ni. AFS Transactions, 43, 113-122.
