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Eisengusswerkstoffe
Dokumenten-Nummer: 57864
Tagungsbeitrag
Pencea, Ion; Stefanescu, Doru Michael; Ruxanda, Roxana; Anghelina, Florina Violeta
Publikationssprache: Englisch
New Aspects Regarding the Structure of Spheroidal Cast Iron Carbon Inclusions Revealed by WAXD
Investigations
Neue Aspekte bezüglich des Struktur von Einschlüssen in Gusseisen mit Kugelgraphit entdeckt durch Untersuchungen
mit Weitwinkel-Rötgendiffraktion
The paper addresses mainly the atomic structure of the spheroidal carbon inclusions (CIs) from a magnesium treated
cast iron. The qualitative phase analysis based on diffraction patterns shows that the CI by-products contain carbon,
ferrite and iron oxides. Based on peak angular positions and their half-width at half-intensity, the distances between
graphenes and the average height of the graphene stack were calculated. To comply with EN 13005 standard, the
calculated results include the extended uncertainties U(95%). The Wide Angle X-ray Diffraction (WAXD) data proves
clearly that the CI from the spheroidal cast iron do not have a polycrystalline graphite structure, but rather a
turbostratic graphite-like structure with the d(002) surprisingly close to the graphite structure, e. g. to 3.34 A. If this
conclusion is accepted, a new approach of the nucleation and growth mechanisms of the CIs in spheroidal cast irons as
turbostratic graphite-like structures should be explored, while the mechanisms based on crystallographic considerations
should be revised.
University Politehnica of Bucharest, RO; Ohio State University, Columbus, OH, US; Emerson Climate Technologies,
Sidney, OH, US; Valahia University, Targoviste, RO
Erscheinungsjahr 2010
S. S.120-125
Seiten/Bilder/Tabellen/Quellen: 6S
Eisengusswerkstoffe
Dokumenten-Nummer: 57821
Tagungsbeitrag
Prasetyo, Y.; Lee, S. K.; Baek, E. R.
Publikationssprache: Englisch
Effect of Copper Addition on Mechanical Properties of Nodular Indefinite Chilled Iron (NICI)
Einfluss eines Kupferzusatzes auf die mechanischen Eigenschaften von Indefinit-Chill-Guss mit Kugelgraphit
Nodular infinite chilled iron (NICI) material with high content of nickel (~4.00%) was usually used as work roll in hot strip
rolling mill. Microstructure of NICI was consists with nodular graphite and cementite with matrix phase consist of
pearlite, martensite and ausferrite that depend on the alloying content. The introduction of copper was successfully
increasing the hardenability of NICI by only using low nickel content (~2.50 %) with small addition of copper (0.52%).
The development of NICI was done by hot shakeout of CO2 sand mold of as-cast iron and then isothermal heating in
muffle furnace in temperature 300 deg C in 6 hours to achieve ausferritic transformation. By achieving the martensite
and ausferrite phase in as-cast condition, the sample will not need austenitizing and quenching process and the sample
that will be free of quenching crack and thermal stress that usually occurred austenitizing and quenching process. It
was confirmed by optical microscope and scanning electron microscope (SEM) observations that with the small addition
of copper (0.52%), the amount of pearlite was very small (~1.00%), but with further addition of copper (2.02%), the
amount of martensite was significantly increase the hardness until 51.56 HRC but the tensile strength was significantly
dropped into 442 Mpa from previously 571 Mpa without copper addition. From hardness and tensile strength data it can
be seen that the optimum content of copper is 1.45 % that have good combination of hardness (47.75 HRC) and
moderate tensile strength (508 Mpa).
Yeungnam University, Gyeongsan, KR
Key Engineering Materials
Erscheinungsjahr 2010
S. S.386-391
Seiten/Bilder/Tabellen/Quellen: 6S
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