Babette Tonn 1,a*, Jacques Lacaze 2,b Stephanie Duwe 1,c

In 1985, Gagné and Argo[2] studied the occurrence of chunky graphite in cylindrical HSDIC (Φ=180 mm). It was proposed that the use of low carbon equivalent (< 4.2) was effective in the elimination of chunk graphite. The use of a pouring temperature above 1,370℃ was also recommended. The beneficial effect of antimony (~ 40 ppm) to inhibit the

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Cast Iron - an overview | ScienceDirect Topics. Graphite elements (black) with different shape are embedded in a metal matrix with a microstructure that depends on the alloy chemical composition, the casting conditions and the heat treatments Figure 1 Different cast irons: (a) pearlitic lamellar cast iron; (b) Exploded graphite in ductile cast iron; (c) Ferritic-pearlitic ductile cast iron; (d ...

graphite floatation in ductile irons

- Those related to nodule shape and size, such as compacted graphite structures, exploded and chunky graphite, graphite floatation, spiky graphite and nodule alignment. ... has a marked effect on the shrinkage tendency of ductile irons. Foundries operating at the higher end of the magnesium range, 0.05% or above, will find that the iron is more ...

Novel method for the fatigue strength assessment of heavy ...

Ductile cast iron (nodular cast iron) is cast iron in which the graphite is present as tiny spheres. Because of additives that are introduced in the molten iron just before casting, the graphite grows as spheres, rather than as flakes of any of the forms that are characteristic of gray iron.

Chunky graphite in ductile iron castings__

As part of a study devoted to the effect of trace elements on graphite degeneracy, near-eutectic ductile iron melts were prepared to which minute amounts of lead and of both lead and cerium were added. The melts were cast into an insulated Y4 mould, giving a solidification time of about 1 hour and a cooling time to room temperature of about 15 hours.

Corrosion Characteristics of Ductile Iron

irons and metals, but since some of these defects are more complex in ductile iron, some ... - Type V is exploded graphite. A minimum of 80% nodular graphite shapes I ... Fig. 2A shows the microstructure of a completely ferritic ductile iron with black graphite nodules in a white ferrite matrix with no pearlite. Fig. 2B shows a pearlitic grade with

Chunky Graphite in Ferritic Spheroidal Graphite Cast Iron ...

Exploded Graphite Versus Chunky Graphite. The location of chunky graphite normally but not exclusively indicates the location of the thermal center of a casting . Degenerate . Live Chat exploded graphite versus chunky graphite in ductile irons . Graphite flotation in ductile iron castings definition and influencing factors

CHARACTERIZATION OF DUCTILE IRON THROUGH …

Exploded Graphite In Ductile Irons. In our blog post ductile iron versus gray iron castings we explore the differences between ductile iron and gray iron, including mechanical and physical properties as well as typical applicationshis particular post, on the other hand, is a generic overview of ductile iron ductile iron is also called spherical ...

Degenerated Graphite Growth in Ductile Iron | Scientific.Net

called chunky graphite. The precipitates of chunky graphite start growing as regular spheroids to undergo later a deformation and form the most scattered type of precipitates. This form of graphite has a detrimental effect on both mechanical and plastic properties of cast iron, as proved in [10,11,12].

Inoculation of Cast Irons ΠAn Overview

Keywords: Ductile iron, Chunky graphite, Cooling rate, Casting, Thermal point 1. Introduction Disintegrated and exploded graphite may be present in the casts from the above-eutectic cast iron, in particular if CE > 4,5%, or in very slowly cooled cross-sections, where spheres of the graphite float and are disintegrated.

Review of Microstructural Features of Chunky Graphite in ...

Graphite shape, which can range from flake to spherical, plays a significant role in determining the mechanical properties of cast irons. Figures 2.4 and 2.5 show that graphite flakes act like cracks in the iron matrix, while graphite spheroids act like "crackarresters", giving the respective irons dramatically different mechanical properties.

Graphite Flotation In Ductile Iron Castings

Keywords : Microstructure, Spheroidal graphite iron, Manufacturing process. INTRODUCTION The use of ductile iron casting (DI) has been increasing constantly all over the world. In the recent years there has been increasing interest in solidification of both thin and thick wall ductile iron casting.

Effect of Graphite Nodularity on Mechanical Properties of ...

Graphite Flotation Nodule Alignment Carbides Flake Graphite Surface Structure Common Metallurgical Defects in Ductile Iron Compacted Graphite Exploded Graphite Chunky Graphite Spiky Graphite Potential Causes; Low residual magnesium and/or rare earth from poor nodularisation practice, high temperatures or long holding time.

Austenitic ductile iron for low temperature applications

exploded graphite in ductile irons. Graphite flotation in ductile iron castings definition Flotation of hypereutectic nodules occurs in ductile irons having carbon equivalents greater than 45 as defined by the expression CE C Si 3 P 3 Flotation arises because the density of the graphite …

Common Metallurgical Defects in Ductile Iron

called chunky graphite. The precipitates of chunky graphite start growing as regular spheroids to undergo later a deformation and form the most scattered type of precipitates. This form of graphite has a detrimental effect on both mechanical and plastic properties of cast iron, as proved in [10,11,12].

exploded graphite in ductile irons

Starting from the idea of Murakami and co‐workers, a new model for the prediction of the fatigue strength is proposed. It allows a sound fatigue assessment of the fatigue strength of as‐cast ductile irons containing solidification defects, such as low nodule count, exploded, chunky and spiky graphite, or microshrinkage porosities.

GRAPHITE STRUCTURES IN CAST IRONS

ductile iron mill. exploded graphite versus chunky graphite in Grinding Mill / exploded graphite versus chunky graphite in ductile irons. A Review of Common Metallurgical Defects in Ductile Cast Iron Elkem. 187; More; 15062 ductile iron piping Chattanooga. Live Chat; Inoculation of Cast Irons An Overview Foundry

exploded graphite in ductile irons

lamellar graphite can be prevented, whereas by exceeding a critical amount of Ce exploded and chunky graphite will be formed [2]. There are different investigations about critical amounts of trace elements affecting graphite morphology in ductile cast iron as reviewed by Reynaud [3]. Buhr [2] reported that already small

On the Solidification of Compacted and Spheroidal Graphite ...

It allows a sound fatigue assessment of the fatigue strength of as‐cast ductile irons containing solidification defects, such as low nodule count, exploded, chunky and spiky graphite, or microshrinkage porosities. The newly developed equation validated by means of an extensive benchmarking with data taken from the literature has shown a very ...

Physico

Exploded Graphite In Ductile Irons. In our blog post ductile iron versus gray iron castings we explore the differences between ductile iron and gray iron, including mechanical and physical properties as well as typical applicationshis particular post, on the other hand, is a generic overview of ductile iron ductile iron is also called spherical ...

Effect of Antimony on Graphite Growth in Ductile Iron ...

Feb 01, 2017· 1. Introduction 1.1. Chunky graphite. Spheroidal graphite cast iron (SGI), also known as ductile iron exhibits favorable ductility over other cast irons due to nodular graphite precipitations; however, in heavy section ductile iron castings or in whole SGI castings with higher alloying content, graphite degeneration can be observed, which is known as chunky graphite (CHG).

NTNU Open: Novel method for the fatigue strength ...

EXPLODED GRAPHITE Caused by high purity charge materials and excess rare earth additions in high carbon equivalent irons or in thicker section castings CHUNKY GRAPHITE Caused by high purity charge ... Elkem manufactures and markets a range of high quality nodularising alloys to produce ductile and compacted graphite cast irons.

Ductile Iron Quality Assurance Guide

Ductile Irons Πadd minimum quantity to achieve: nodule count ... Inoculation of cast Irons - an overview 359 Exploded Graphite Nodules Unetched X300 Exploded Graphite Nodules ... 55th Indian Foundry Congress 2007 360 J. N. Harvey and G. A. Noble Spiky Graphite, Etched in 4% Picral X100 Spiky Graphite, Stereoscan X530 Chunky Graphite, Etched ...

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Graphite Structures in Cast Irons - ELKEM

Material, AutoCad and Fun: 2009

Properties of Ductile Iron for Waterworks Fittings and Accessories A. I. Al-Ghonamy1, M. Ramadan 1,2*, N. Fathy3, K. M. Hafez and A. A. El-Wakil1,4 Abstract— Waterworks fittings and accessories are important applications for ductile irons. Although, in the design of these components the graphite nodularity is a critical attribute for

DUCTILE IRON DATA FOR ENGINEERS

The present invention relates to a method for nodularizing treatment of ductile iron using a ladle treatment method for nodularizing of a magnesium ferrosilicon alloy, where a magnesium ferrosilicon nodularizing alloy consisting essentially of 40 to 80% by weight of silicon, 2 to 15 % by weight of magnesium, 0,3 to 5 % by weight of lanthanum, 0 to 6 % by weight of calcium, 0 to 5 % by weight ...