Elongated inclusions, particularly MnS, contribute
significantly to reduced ductility and toughness in hot
rolled steel but earlier research indicated that these properties
can be improved by titanium additions. Such additions to a
steel result in titanium being dissolved in manganese sulphide
or MnS being replaced by TiS and/or titanium carbosulphides.
In the present study, a steel was designed to decrease alloying
element segregation and to evaluate the effect of titanium on
centreline sulphide precipitates. Precipitates were identified
by using scanning electron microscopy and characterized
by the use of transmission electron microscopy following
sample preparation by focused ion beam milling techniques.
Irontitanium-sulphides form in close proximity to MnS
precipitates that contain iron. Evidence is provided that an
increase in the titanium content of steel leads to an increase
in the percentage of titanium contained in the iron sulphides
and a decrease in the iron content of MnS inclusions.