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The need for clean materials; the sources of trace impurities in metals; preparation of clean superalloys; high purity, low residual and clean steels; chemical analysis of trace impurities in metals; grain-boundary segregation of impurities in iron and steels and effects on steel properties; the effect of grain-boundary segregation on intergranular failures; trace element effects on high-temperature fracture; solid solution hardening by impurities.
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