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spherulites

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Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003106
EISBN: 978-1-62708-199-3
... particles, or spherulites, rather than as flakes. This is accomplished through the addition of a very small but definite amount of magnesium and/or cerium to the molten iron in a process step called nodulizing. Ductile iron is produced from the same types of raw material as gray iron, but usually...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003110
EISBN: 978-1-62708-199-3
... shaped graphite nodules instead of flakes, as in gray iron, or small graphite spherulites, as in ductile iron. Malleable iron is produced by first casting the iron as a white iron and then heat treating the white cast iron to convert the iron carbide into the irregularly shaped nodules of graphite. This...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003025
EISBN: 978-1-62708-200-6
... into the interstices between the spherulites, leaving these as contaminated boundaries of lower strength and modulus. Shrinkage during crystallization may leave stresses and voids in these interstices, weakening them even more. The surface between spherulites and amorphous interstices is the weak...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003023
EISBN: 978-1-62708-200-6
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003245
EISBN: 978-1-62708-199-3
... yields a fully retained nodule. Note that the graphite spherulite has been well preserved. As polished, not etched. 800× For cast iron, polishing with diamond abrasives has been found to be most satisfactory. Polishing in two stages is recommended. Coarse polishing frequently is performed with 6...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001303
EISBN: 978-1-62708-170-2
... or nodular iron, contains spherulitic graphite in which the graphite flakes form into balls as do cabbage leaves. Ductile iron is so named because in the as-cast form it exhibits measurable ductility. Ductile iron typically contains 3 to 4% C, 1.8 to 2.8% Si, and 0.1 to 1.0% Mn. Alloying additions...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006287
EISBN: 978-1-62708-169-6
... separates first from the melt. For example, primary silicon particles form first in the liquid-plus-silicon phase of hypereutectic aluminum-silicon alloys. The coarse, faceted primary silicon particles are refined to a fine, spherulitic structure using additives containing phosphorus. In certain casting...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003005
EISBN: 978-1-62708-200-6
... capacity of malleable iron are useful for long service in highly stressed parts. Ductile iron, also known as spheroidal graphite or nodular iron, contains spherulitic graphite in which the graphite flakes form into balls simular to cabbage leaves. Ductile iron is so named because in the as-cast form...