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Eisengusswerkstoffe
Dokumenten-Nummer: 57850
Tagungsbeitrag
Zhang, Jian-jun; Gao, Yi-Min; Xing, Jian Dong; Ma, Sheng-Qiang; Yan, Wan-Qin; Yan, Jing-Bo
Publikationssprache: Englisch
Microstructure and Properties of Isothermally Quenched High Boron White Cast Iron
Mikrogefüge und Eigenschaften von isothermisch abgeschrecktem borreichem weißem Gusseisen
Microstructure and properties of isothermally quenched high boron white cast iron were investigated in this paper. The
results show that the microstructure of high boron white cast iron is mainly composed of many continuous and netlike
eutectic borides, pearlite and ferrite under as-cast condition. The microhardness of Fe2B ranges in 1200-1600HV
whose value seems to approximate that of (Fe, Cr)7C3-type carbide (HV1200~1800) in high chromium white cast iron.
After isothermal quenching, the matrix transforms into lower bainite in which carbide precipitations are arranged in
parallel rows at an angle of 60 deg to the long axis of the plates, but the morphology of boride remains nearly
unchanged compared with its as-cast condition. Moreover, precipitation particles with the size of about 1~4 micro m
can be found in the matrix of isothermally quenched high boron white cast iron. Impact fracture morphology of
isothermally quenched high boron white cast iron indicates that fracture propagated more easily through boride/matrix
interface than through matrix.
Xian Jiaotong University, CN
Erscheinungsjahr 2010
S. S.207-212
Seiten/Bilder/Tabellen/Quellen: 6S
Eisengusswerkstoffe
Dokumenten-Nummer: 57827
Tagungsbeitrag
Zhao, Hai-dong; Liu, Bai-cheng
Prediction of Microstructure and Porosity Formation of Practical Spheroidal Graphite Iron Castings
Vorhersage des Mikrogefüges und der Porositätsbildung bei praktischen Gussteilen aus Gusseisen mit Kugelgraphit
The mathematical model for microstructure formation and porosity prediction during solidification process of SG iron
casting was established and applied to a practical brake housing casting. Quantitative microstructure analysis of
specimens machined from the castings was compared with the simulation, and the two results are in acceptable
agreement on nodule counts and size, pearlite fractions and hardness. It is indicated that the model can calculate the
fraction of ferrite and pearlite more accurately, and specially can reflect the effect of both under-cooling during
solidification and the nodules formed in eutectic period on the pearlite content. The present porosity prediction was
compared with those of a former method and commercial software, which leads to that the current methods used for
porosity prediction should be investigated and improved further.
South China University of Technology, Guangzhou, CN; Tsinghua University, Beijing, CN
Key Engineering Materials
Erscheinungsjahr 2010
S. S.349-354
Seiten/Bilder/Tabellen/Quellen: 6S
Giesserei Literaturschau