Abstract
AbstractSecondary Ion Mass Spectrometry (SIMS) was used to qualitatively analyse the distribution of trace solutes in nodules, compacted graphite (CG) particles, and the surrounding matrix in Mg-treated cast iron. In both nodular- and compacted-graphite cast iron, Mg was clearly observed to be present in the graphite particles. Ca and Ti were also observed in the particles at lower levels than Mg. The S was uniformly distributed at a low level throughout the cast iron, with higher concentrations in graphite particles containing Mg and Ca. The distribution of oxygen was also observed to be uniform throughout the graphite and matrix, with higher ion signals than S. The present results support the theory of nodule or compacted graphite growth in which the nodularising elements Mg or Rare Earths are incorporated into the graphite lattice during growth, or adsorbed onto the prismatic or pyramidal planes. The results do not support the theories which assume the nodularising elements react with Al and S, indirec...
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