Metallography and Microstructures of Ductile Irons
Metallographic techniques for ductile irons are similar to those for other cast irons but more difficult than for steels, because graphite retention is a challenging task. This article presents recommended procedures to prepare ductile irons. It discusses three contemporary approaches for preparing ductile cast iron specimens with a wide range of phases and constituents as well as variations in graphite morphologies. A wide variety of matrix microstructures can be obtained in ductile irons. Examples are presented using a variety of etchants. Control of the nodularity of graphite in ductile irons is critical to their performance. The article presents details concerning the characterization of the graphite nodules.
George F. Vander Voort, Juan Asensio-Lozano, Metallography and Microstructures of Ductile Irons, Cast Iron Science and Technology, Vol 1A, ASM Handbook, Edited By Doru M. Stefanescu, ASM International, 2017, p 645–656, https://doi.org/10.31399/asm.hb.v01a.a0006350
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