Vliv dezoxidačního a modifikačního činidla CaSiBa na mikrostrukturu oceli s 0,3 % C

experimental deoxidation agent /modifier
CaSiBa and its impact on steel containing
0.3% C. The alloy CaSiBa in a form of a cored
wire containing approximately 15% barium and
the same amount of calcium was chosen as a
steel modifier. According to physical-chemical
proper ties both alkaline metals have high
affinity to oxygen and sulphur. In addition,
they should suppor t the non-metallic inclusion
shape modification. Two experimental melts
(weight 50 kg) were cast in a vacuum induction
furnace. The first one was deoxidized by pure
aluminium only and during the second one
the CaSiBa alloy was applied. The influence
of modification with barium was evaluated by
scanning electron microscopy including EDAX,
determination of content of non-metallic
inclusions and change of mechanical proper ties.
Analysis of the results showed that CaSiBa
has affected the morphology of inclusions.