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pearlitic ductile iron

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Image
Published: 01 March 2002
Fig. 2.51 Pearlitic ductile (nodular) cast iron (2.95% C, 0.36% Mn, 2.75% Si, and 0.09% Mg). Dark, rounded particles are graphite. 4% picral etch. 500× More
Image
Published: 01 August 2018
Fig. 17.86 Ductile cast iron with (a) pearlitic and (b) martensitic matrix. Etchant: nital. Courtesy of J. Sertucha, Azterlan, Centro de Investigacion Metalurgica, Durango, Bizkaia, Spain. More
Image
Published: 01 January 2022
Fig. 9.1 Typical ferritic, pearlitic, bainitic, and martensitic ductile iron microstructures More
Image
Published: 01 March 2002
Fig. 4.23 Representative micrographs of ferrite-pearlite ductile cast iron test block 1. (a) Note the ferrite halo around the graphite nodules. The matrix is pearlite. 4% picral etch. 100×. (b) Same specimen unetched to compare with ASTM A 247, plate III, in Fig. 4.22 . 100× More
Image
Published: 01 August 2018
Fig. 17.85 Ductile cast irons with ferrite plus pearlite matrixes, with different volume fractions of ferrite. The ferrite is formed preferentially around the graphite nodules. Decreasing the ferrite volume fraction increases the strength, as in the case of steels. Courtesy of J. Sertucha More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140175
EISBN: 978-1-62708-264-8
.... In the as-cast condition, a ductile iron will be ferritic, pearlitic, or, more often, some mix of ferritic and pearlitic. Fig. 16.12 presents a micrograph of a ductile cast iron that has a matrix with a pearlite-ferrite mix that is predominantly white ferrite. Ductile irons are graded or classified as shown...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170062
EISBN: 978-1-62708-297-6
... to ductile iron. Fig. 1 Spheroidal graphite in an unetched ductile iron matrix shown at 75× (a) and in the etched (picral) condition shown at 300× (b). Etching reveals that the matrix consists of ferritic envelopes around the graphite nodules (bull’s-eye structure) surrounded by a pearlitic matrix...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400087
EISBN: 978-1-62708-258-7
... limit is very restricting for some fine microstructures. For example, as described in Chapter 2 , pearlite is a constituent in steel consisting of alternating plates or lamella of soft ferrite (nearly pure iron) and hard cementite (iron carbide). This microstructure is mostly unresolved...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400023
EISBN: 978-1-62708-258-7
... a minimal amount of cementite, for example, very-low-carbon automotive sheet steels. These latter steels need ductility and formability, and the presence of cementite tends to degrade these properties. Pearlite Pearlite is a constituent that contains both ferrite and cementite. According to the iron...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060247
EISBN: 978-1-62708-261-7
... of their production process. For example, malleable iron castings are subjected to a malleabilizing treatment; the highest ductility grades of ductile iron are often annealed; permanent mold cast gray irons are annealed or normalized; and pearlitic malleable iron and high-strength grades of ductile iron may be either...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2022
DOI: 10.31399/asm.tb.isceg.t59320163
EISBN: 978-1-62708-332-4
... the typical microstructures of ferritic, predominantly pearlitic, bainitic, and martensitic, microstructures. Fig. 9.1 Typical ferritic, pearlitic, bainitic, and martensitic ductile iron microstructures 9.2 Advantages of Ductile Iron Ductile iron offers superior tensile and yield strengths...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170100
EISBN: 978-1-62708-297-6
... strength, while increasing the amount of pearlite increases hardness and strength but decreases ductility. Martensite provides further increases in hardness and strength but with additional decreases in ductility. A comparison of tensile properties with hardness of pearlitic malleable iron and as-cast...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2022
DOI: 10.31399/asm.tb.isceg.t59320031
EISBN: 978-1-62708-332-4
... (ductile or nodular) shapes of graphite, as indicated. The rate of cooling through the eutectoid interval that influences the microstructure of pearlite or ferrite is shown. The heat treatment of white iron to obtain cluster graphite (or temper graphite) along with the targeted matrix to obtain different...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730069
EISBN: 978-1-62708-283-9
... areas are pearlite. Source: Ref 7.6 If the sulfur content is kept very low, and magnesium or cerium is added to the melt just before casting, the graphite will form as spheroids. The resulting product is called ductile cast iron. Figure 7.12 shows a typical microstructure. The mechanical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170091
EISBN: 978-1-62708-297-6
...%, depending on whether a ferritic or pearlitic structure is desired. The phosphorus content should be less than 0.06% in order to obtain maximum ductility from the matrix. Fig. 2 Optimum range for carbon and silicon contents for CG iron 94 / Cast Irons Sulfur Content. Although CG iron has been produced from...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240453
EISBN: 978-1-62708-251-8
... treatment), to increase the nodule count. Increasing the nodule count is important, because a higher nodule count is associated with less chilling tendency ( Fig. 24.19 ) and a higher as-cast ferrite/pearlite ratio. Fig. 24.19 Postinoculation of ductile cast iron. Source: Ref 2 Postcasting...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440207
EISBN: 978-1-62708-262-4
... 0.10 … High-strength grade 3.0 1.5 0.8 0.20 0.10 … White cast iron 2.0–3.5 (all combined) 0.5–1.5 0.5 0.2–0.4 0.10 … Malleable cast iron 2.3 1.0 0.4 0.20 0.10 … Ductile cast iron Ferrite 3.5 2.5 0.2 0.05 0.01 0.04 Mg Pearlitic 3.5 2.5...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220583
EISBN: 978-1-62708-259-4
... ductile iron Nodular graphite B, austempering Heat treatment Note: A = austenite, F = ferrite, P = pearlite, M = martensite, B = bainite. Source: Ref 5 Though cast irons with less than 4.3% C (the eutectic composition in the stable Fe-C phase diagram) are commonly classified...
Image
Published: 01 August 2018
graphite. (c) Graphite formation inside areas of cementite, still present in the microstructure. (d) Graphite formed is not compact in shape. (e) Blackheart malleable cast iron. (Compare to ductile cast iron structures, in the section “ 17.5 Nodular Cast Iron or Ductile Cast Iron ” in this chapter More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420143
EISBN: 978-1-62708-310-2
... deformation. Fig. 8.18 Pearlite interlamellar spacing versus transformation temperature. Source: Ref 8.13 as published in Ref 8.1 Although fully pearlitic steels with a lamellar microstructure have high strength, high hardness, and good wear resistance, they also have rather poor ductility...