On the scavenging effect of precipitated austenite in a low carbon Fe-5.5Ni alloy |
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Authors: | J I Kim J W Morris |
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Affiliation: | (1) Lawrence Berkeley Laboratory, University of California, 94720 Berkeley, CA;(2) Department of Materials Science and Engineering, University of California, 94720 Berkeley, CA |
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Abstract: | The scavenging effect of precipitated austenite in a low carbon, commercial Fe-5.5Ni cryogenic alloy was investigated through
observation of the dissolution of cementite precipitates during intercritical tempering and study of the associated change
in Charpy impact toughness. Cementite precipitates initially located along prior austenite grain boundaries were gradually
dissolved into reverted austenite as the intercritical tempering proceeded. The austenite tends to form at or around the carbide
particles and may be catalyzed by their presence. The Charpy impact energy is changed through both a decrease in the ductile-brittle
transition temperature and an increase in the upper shelf energy. The latter effect is specifically associated with the dissolution
of the carbides which act as preferential void nucleation sites in the untempered alloy. |
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