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Substantial differences in the variation of through-thickness ductility with location in plate length, width, and thickness have been observed. Some rareearth-treated steel plates made for lamellar-tearing-resistant applications exhibit large variations in ductility with location, whereas other plates are much more uniform. Data are given to illustrate both patterns of behavior.
When variation is encountered, the poorest ductility is found in that portion of the plate that represents the bottom/midwidth/midthickness of the ingot. Rare-earth-oxysulfide inclusions tend to cluster and segregate to that location and reduce ductility there. If such inclusions are sufficiently prevalent, the consequent variation in ductility can be substantial. If inclusion prevalence is very low, however, good uniformity of properties is observed.
plate, lamellar tearing, ductility, through-thickness tension test, inclusions
Associate Research Consultant, Research Laboratory, U.S. Steel Corporation, Monroeville, Pa.