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Segregation Effects and the Toughness of High-Strength Steels.
Final technical rept. 1 Oct 73-30 Sep 76,
CAMBRIDGE UNIV (ENGLAND) DEPT OF METALLURGY AND MATERIALS SCIENCE
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A study has been made of impurity segregation in low alloy steels and iron alloys. Various problems of practical importance have been investigated together with some of the more fundamental aspects of segregation. The general approach has been to employ simplified alloy compositions and to combine mechanical testing with Auger electron spectroscopy AES and scanning electron microscopy. Segregation occurring during the austenitizing cycle has been examined in commercial and high-purity Ni-Cr steels. Low concentrations of P, Sb and Sn do not appear to embrittle as-quenched commercial Ni-Cr or Ni-Cr-Mo steels. By employing higher P concentrations it is shown that P segregation occurs at low austenitizing temperatures in Mn-free Ni-Cr steels. The main effect of Mn additions is to decrease the observed temperature dependence of P segregation in austenite.
APPROVED FOR PUBLIC RELEASE