Thermal and microstructural characterization of a novel ductile cast iron modified by aluminum addition

High-chromium white cast iron (WCI) specimens locally reinforced with WC–metal matrix composites were produced via an ex situ technique: powder mixtures of WC and Fe cold-pressed in a pre-form were inserted in the mold cavity before pouring the base metal. The microstructure of the resulting reinforcement is a matrix of martensite (α’) and austenite (γ) with WC particles evenly distributed and (Fe,W,Cr)6C carbides that are formed from the reaction between the molten metal and the inserted pre-form. The (Fe,W,Cr)6C precipitation leads to the hypoeutectic solidification of the matrix and the final microstructure consists of martensite, formed from primary austenite during cooling and eutectic constituent with (Fe,Cr)7C3 and (Fe,W,Cr)6C carbides. The presence of a reaction zone with 200 µm of thickness, between the base metal and the composite should guarantee a strong bonding between these two zones.

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Characterization of Niobium Carbide Layers Produced in Ductile Cast Iron Using Thermo-Reactive Treatments

Materials Performance and Characterization ◽

10.1520/mpc20160093 ◽

2017 ◽

Vol 6 (4) ◽

pp. 20160093 ◽

Cited By ~ 2

Author(s):

C. Soares ◽

F. E. Mariani ◽

L. C. Casteletti ◽

A. N. Lombardi ◽

G. E. Totten

Keyword(s):

Cast Iron ◽

Niobium Carbide ◽

Ductile Cast Iron

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A Novel Method for Microstructural Characterization of Cast Iron

Microscopy and Microanalysis ◽

10.1017/s1431927614006084 ◽

2014 ◽

Vol 20 (S3) ◽

pp. 872-873 ◽

Cited By ~ 1

Author(s):

J P Aral ◽

Mozhi Varman

Keyword(s):

Cast Iron ◽

Microstructural Characterization ◽

Novel Method

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Microstructural Characterization of Boride Layers on Gray Cast Iron and Ductil Cast Iron by Dehydrated Paste-Pack Boriding

Microscopy and Microanalysis ◽

10.1017/s1431927619004148 ◽

2019 ◽

Vol 25 (S2) ◽

pp. 682-683 ◽

Cited By ~ 1

Author(s):

M Ortiz-Domínguez ◽

A Cruz-Avilés ◽

I Morgado-Gonzalez ◽

E Cardoso-Legorreta ◽

OA Gómez-Vargas ◽

...

Keyword(s):

Cast Iron ◽

Gray Cast Iron ◽

Microstructural Characterization ◽

Gray Cast

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Characterization of boride coatings on a ductile cast iron

Protection of Metals and Physical Chemistry of Surfaces ◽

10.1134/s207020511702006x ◽

2017 ◽

Vol 53 (2) ◽

pp. 306-311 ◽

Cited By ~ 13

Author(s):

Omar Azouani ◽

Mourad Keddam ◽

Omar Allaoui ◽

Abdelaziz Sehisseh

Keyword(s):

Cast Iron ◽

Ductile Cast Iron ◽

Boride Coatings

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Three-Dimensional Microstructural Characterization of Cast Iron Alloys for Numerical Analyses

Materials Science Forum ◽

10.4028/www.scientific.net/msf.925.427 ◽

2018 ◽

Vol 925 ◽

pp. 427-435

Author(s):

Kent Salomonsson ◽

Anders E.W. Jarfors

Keyword(s):

Cast Iron ◽

Three Dimensional ◽

Microstructural Characterization ◽

Iron Alloys ◽

Thermal Dissipation ◽

Compacted Graphite ◽

Dimensional Reconstruction ◽

Microscopic Features ◽

Nodular Graphite

In this paper, we aim at characterizing three different cast iron alloys and their microstructural features, namely lamellar, compacted and nodular graphite iron. The characterization of microscopic features is essential for the development of methods to optimize the behavior of cast iron alloys; e.g. maximize thermal dissipation and/or maximize ductility while maintaining strength. The variation of these properties is commonly analyzed by metallography on two-dimensional representations of the alloy. However, more precise estimates of the morphologies and material characteristics is obtained by three-dimensional reconstruction of microstructures. The use of X-ray microtomography provides an excellent tool to generate high resolution three-dimensional microstructure images. The characteristics of the graphite constituent in the microstructure, including the size, shape and connectivity, were analyzed for the different cast iron alloys. It was observed that the lamellar and compacted graphite iron alloys have relatively large connected graphite morphologies, as opposed to ductile iron where the graphite is present as nodules. The results of the characterization for the different alloys were ultimately used to generate finite element models.

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