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Dokumenten-Nummer: 57872
Tagungsbeitrag
Ren, Qin-Xin; You, Ming; Yao, Yun-Bang; Wen, Guang-Min; Cai, Qi-zhou
Publikationssprache: Englisch
Effect of Yttrium-Containing Nodulizer on the Microstructure Formation and Mechanical Properties
of Heavy Section Ductile Iron Castings
Einfluss eines yttriumhaltigen Kugelbildners auf die Mikrogefügebildung und die mechanischen Eigenschaften von
dickwandigen Gussteilen aus Gusseisen mit Kugelgraphit
Ductile iron specimens with dimensions of 400 mm x 400 mm x 450 mm were prepared by treating the melt with an
yttrium-containing nodulizer. The effect of yttrium on microstructure and mechanical properties was investigated, and
the formation of degenerate graphite was discussed as well. The results show that the yttrium-containing nodulizer has
good nodulization fading resistance for heavy section ductile iron, since the high melting point hexagonal oxide Y2O3
particles were formed from the nodulizer in the melt and those could act as heterogeneous nuclei for graphite nodule
for a long time. Segregation of Ti and MgO at grain boundaries broke the austenite shell, resulting in graphite
degeneration. When heavy section ductile iron castings with pearlite matrix were cast, graphite nodule size became
finer and the nodularity of graphite nodules improved due to the addition of 0.01wt% Sb to the melt, and pearlite
content in specimens increased due to alloying with Cu, Cr, Mo. The heavy section ductile iron tool bed was fabricated
by treating the melt with the yttrium-containing nodulizer and Ni. The nodularity of the attached block was 85%~90%,
tensile strength, elongation and impact toughness were 440 MPa, 23.3% and 5.0 J/cm(exp 2) respectively.
CITIC Heavy Industries, Luoyang, CN; Huazhong University of Science and Technology, Wuhan, CN
Erscheinungsjahr 2010
S. S.73-78
Seiten/Bilder/Tabellen/Quellen: 6S
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