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The effect of molybdenum (Mo) on the microstructure and thermal expansion of heat-resistant ductile iron having ferrite matrix was investigated. Microstructure of heat-resistant ferritic ductile iron consists of ferrite, eutectic carbide at eutectic cell boundaries, precipitated carbide in grain and graphite. Pearlite was found around eutectic carbide in some specimens, however, all pearlite was decomposed by the annealing treatment. As Mo content was increased, the fraction of pearlite and the number and size of carbide increased and the number of graphite decreased. After annealing, a pearlite decompsed to Fe and C atoms. The size of precipitated carbide increased by the effect of particel coarsening. As Mo contents increased, the contraction by ferrite-austenite transformation decreased. The growth at high temperature exhibited different patterns between 900 and 1,000 o C. It is considered to be due to the differences in the fraction of transformed austenite.

Effect of Mo on the microstructure and thermal expansion of high Si ferritic heat-resistant ductile iron