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- W1972594865 abstract "The graphite nodule density and size distribution are two very important parameters in the characterization of the microstructures of ductile iron. Various amount of cerium element ( Ce ) (from 0.005% to 0.020%) were added into ductile iron cast in sand moulds to investigate the effect of Ce concentration on graphite nodule count and size distribution. The addition of Ce has a significant effect on solidified microstructures of ductile iron. Increasing of Ce concentration from 0.005% to 0.014%, an obvious increase in nodule graphite amount is achieved and graphite size becomes finer. When the addition level of Ce reaches 0.018% or 0.020%, spheroidal graphite begins to coarsen, resulting in the decrease in graphite amount and formation of the some non-spherical graphite. An evident nucleus and faceted crystals inside a nodule are clearly distinguished and the thin flakes that constitute the nodule are observed from the SEM photograph. EDX-analysis of nucleus of the spheroidal graphite shows that it is composed of sulfur, cerium, magnesium and trace calcium. The 3-D nodule count of ductile iron is 11.7 × 10 3 / mm 3 with 0.005% Ce addition. The value is 45.8 × 10 3 / mm 3 with Ce addition up to 0.014% and the majority of diameter is less than 30 µm. However, with 0.018% Ce residual, the nodule count decreases to 29.0 × 10 3 / mm 3 . The value is close to that of 0.018% Ce when Ce concentration is 0.020%, and the majority of diameter is less than 40 µm. The results indicate that the graphite nodule count reaches the maximum and mean diameter reaches the minimum with 0.014% Ce residual existing in ductile iron." @default.
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- W1972594865 date "2009-03-20" @default.
- W1972594865 modified "2023-09-25" @default.
- W1972594865 title "EFFECT OF Ce ON GRAPHITE NODULE COUNT AND SIZE DISTRIBUTION IN DUCTILE IRON" @default.
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- W1972594865 doi "https://doi.org/10.1142/s0217979209061731" @default.
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