184/1 Chunky graphite in ductile iron castings R Källbom *, K Hamberg ** and L-E Björkegren *. * Swedish Foundry Association, Sweden, ** Chalmers University of Technology, Sweden. Abstract Non-spherical graphite morphology is detrimental on the mechanical properties of ductile iron castings. This includes the branched and interconnected chunky graphite that occasionally occurs in the thermal center of castings. In this work the graphite morphology in ferritic ductile iron that contained chunky graphite was studied. Chunky graphite was shown to be a progressively degenerated morphology of spherical graphite. Attempts to investigate the presence and segregation patterns of elements that might play a role in the still concealed formation and growth mechanism of chunky graphite were made. No macro segregation was detected. The possible role of micro segregation of trace elements was discussed but could not be determined. The graphite nucleation potential seemed to be low in the chunky graphite areas due to the lack of available oxygen and/or sulphur. Key words ductile iron, graphite morphology, chunky graphite, segregation, nucleation
Chunky graphite in ductile iron castings
Jun 23, 2023
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