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The changes of ADI structure during high temperature annealing

Krzyńska A., Kaczorowski M.

Archives of Foundry Engineering

2010

Vol. 10, iss. 1 spec.

87--92

The results of structure investigations of ADI during it was annealing at elevated temperature are presented. Ductile iron austempered at temperature 325 °C was then isothermally annealed 360 minutes at temperature 400, 450, 500 and 550 °C. The structure investigations showed that annealing at these temperatures caused substantial structure changes and thus essential hardness decrease, which is most useful property of ADI from point of view its practical application. Degradation advance of the structure depends mainly on annealing temperature, less on the time of the heat treatment. It was concluded that high temperature annealing caused precipitation of Fe3C type carbides, which morphology and distribution depend on temperature. In case of 400 °C annealing the carbides precipitates inside bainitic ferrite lath in specific crystallographic planes and partly at the grain boundaries. The annealing at the temperature 550 °C caused disappearing of characteristic for ADI needle or lath – like morphology, which is replaced with equiaxed grains. In this case Fe3C carbides take the form very fine precipitates with spheroidal geometry.