quantification of casting skin in ductile and compacted graphite

Compacted graphite iron : On solidification phenomena

An improved understanding of solidification of compacted graphite iron (CGI) is necessary to predict shrinkage related casting defects. Spheroidal graphite is not only found in ductile iron (SGI) but usually also in CGI, but its characteristics and role in this material is less understood.

Fatigue crack growth in compacted and spheroidal

2020/2/1Graphite cast irons are classified from the morphology of the graphite inclusions such as Spheroidal, nodular or ductile Graphite Iron (SGI), Flake or lamellar Graphite Iron (FGI) and Compacted or vermicular Graphite Iron (CGI).

Cretu, M.; Teleaba, V.; Ionescu, S.; Ionescu, A. Grigorescu, M.;

Stefanescu, D.M.; Wills, S; ; Massone, J; Duncan, F - Quantification of Casting Skin in Ductile and Compacted Graphite Irons and Its Effect on Tensile Properties, Transactions of the American Foundry Society, vol 117, pages 587-606

Bending Fatigue Behavior of Blast Cleaned Grey Cast

Bending Fatigue Behavior of Blast Cleaned Grey Cast Iron M. Ahmad, R.L. Peng, M. Knig, S. Johansson Abstract. This paper presents a detailed study on the effect of an industrial blast cleaning process on the fatigue behavior of a grey cast iron with regard to the residual stresses and microstructural changes induced by the process. []

Ductile and Compacted Graphite Iron Casting Skin

Compacted graphite (CG) iron features a good combination of tensile strength, impact resistance, thermal conductivity and damping capacity. This combination makes CG iron a material of choice for various applications, especially for the automobile industry. The mechanical properties of CG iron listed in the standards (i.e. ASTM) are for machined specimens. However, since most iron castings

Advanced Lost Foam Casting Processes and Materials

Advantages of LFCP that have not been fully utilized are 1) freedom from gray iron "skin" formation in ductile and compacted graphite iron and 2) elimination of hot tearing for high strength, cast aluminum alloys. These advantages, combined with the inherent near-net

Lecture 10 Dispersed porosity in ductile iron casting

Dispersed Porosity in Ductile Iron Casting INTRODUCTION It is widely accepted that the nodule count has a significant effect on the quality of SG cast iron. It is often used to evaluate the quality of the iron because a high nodule count is typically associated with improved mechanical properties.

Effect of Cooling Rate on Microstructure and Mechanical

JMEPEG (2013) 22:300-305 DOI: 10.1007/s11665-012-0233-0 The Author(s). This article is published with open access at Springerlink 1059-9495/$19.00 Effect of Cooling Rate on Microstructure and Mechanical Properties of Thin-Walled Ductile Iron Castings

Advanced Lost Foam Casting Processes and Materials

1) freedom from gray iron "skin" formation in ductile and compacted graphite iron and 2) elimination of hot tearing for high strength, cast aluminum alloys. These advantages, combined with the inherent near-net shape capability of the LFCP, would allow the

Investigation of Cast Iron Processing to Produce Controlled Dual Graphite Structure in Castings

Table 1. Typical Mechanical Properties of Gray (GI), Compacted Graphite (CGI) and Ductile Iron (DI) with Spheroidal Graphite1, 2 Material Matrix UTS, MPa Hardness, HB Elongation, % Quality factor (YST/HB) Heat conductivity, W/mK GI Pearlitic 220 -270 190 230 Less than 1 1.0 1.2 45 55

ACTICOTE CG – for compacted graphite iron castings

disruption of the compacted graphite within the surface of the casting. This results in a flake graphite containing skin. Generally, this skin is less than one millimetre thick, but it can be greater in thicker sectioned castings. The formation of a flake graphite skin

Challenges In Cutting CGI

Compacted graphite iron is increasingly used for diesel and racing engine components. The choice of cutting tool can dictate how effective shops are able to machine this challenging material. Ongoing development of tough, new workpiece materials is driving cutting

Bending Fatigue Behavior of Blast Cleaned Grey Cast

Bending Fatigue Behavior of Blast Cleaned Grey Cast Iron M. Ahmad, R.L. Peng, M. Knig, S. Johansson Abstract. This paper presents a detailed study on the effect of an industrial blast cleaning process on the fatigue behavior of a grey cast iron with regard to the residual stresses and microstructural changes induced by the process. []

A Review of Common Metallurgical Defects in Ductile Cast Iron

Figure 4: Sample with compacted graphite present in the matrix due to partly failed nodularisation process. Another cause of CG particles in the matrix is an incorrect sulphur level in the base iron. Many foundries melt both grey and ductile charges and segregation

The solidification of ductile cast iron

The microsegregation of Mn, Cu, Cr, Mo, Ni and Si has been measured in cast ductile iron and in ductile iron which has been quenched when partially solidified. Effective segregation coefficients have been determined for each of the elements, and used to calculate the segregation on the basis of the Scheil equation. The calculated values agree reasonably well with the values of the solute

Machinability of Compacted Graphite Iron in Honing

Compacted graphite iron (CGI) has been viewed as the next generation casting material for diesel engines to further the automotive energy efficiency because of its better mechanical strength for lighter engine designs as compared to gray cast iron. The machinability

Lecture 10 Dispersed porosity in ductile iron casting

Dispersed Porosity in Ductile Iron Casting INTRODUCTION It is widely accepted that the nodule count has a significant effect on the quality of SG cast iron. It is often used to evaluate the quality of the iron because a high nodule count is typically associated with improved mechanical properties.

Characterization and modeling of the mechanical

2017/12/21Two ductile iron grades of GJS-500-7 and GJS-500-14, with compositions presented in Table 1 were cast. The GJS-500-7 was cast in one batch. The grade GJS-500-14 (high silicon ductile iron) was cast in two batches one without and one with the addition of 160 ppm Antimony (Sb) named as GJS-500-14 and GJS-500-14(Sb), respectively.. Sb was added to investigate its effect on the

Bending Fatigue Behavior of Blast Cleaned Grey Cast

Bending Fatigue Behavior of Blast Cleaned Grey Cast Iron M. Ahmad, R.L. Peng, M. Knig, S. Johansson Abstract. This paper presents a detailed study on the effect of an industrial blast cleaning process on the fatigue behavior of a grey cast iron with regard to the residual stresses and microstructural changes induced by the process. []

The Occurrence and the Effect of Casting Skin in

This paper reviews the recent works on the casting skin effect on tensile and fatigue properties in compacted graphite and ductile irons. It was found that the tensile and fatigue strength were reduced by 9% and 40% respectively because of the presence of the casting skin.

Bending Fatigue Behavior of Blast Cleaned Grey Cast

Bending Fatigue Behavior of Blast Cleaned Grey Cast Iron M. Ahmad, R.L. Peng, M. Knig, S. Johansson Abstract. This paper presents a detailed study on the effect of an industrial blast cleaning process on the fatigue behavior of a grey cast iron with regard to the residual stresses and microstructural changes induced by the process. []

Insider's Guide to Cast Iron Welding

In addition to compacted graphite cast iron (CG), which is the fifth type of cast iron but not standardized, CG cast iron has an intermediate microstructure between grey and ductile cast irons. The main difference between the different types of cast irons is the form of carbon in the alloy; the carbon may present as combined carbon such as in carbides, separate, or free graphite.

Lecture 10 Dispersed porosity in ductile iron casting

Dispersed Porosity in Ductile Iron Casting INTRODUCTION It is widely accepted that the nodule count has a significant effect on the quality of SG cast iron. It is often used to evaluate the quality of the iron because a high nodule count is typically associated with improved mechanical properties.

Effect of Cooling Rate on Microstructure and Mechanical

JMEPEG (2013) 22:300-305 DOI: 10.1007/s11665-012-0233-0 The Author(s). This article is published with open access at Springerlink 1059-9495/$19.00 Effect of Cooling Rate on Microstructure and Mechanical Properties of Thin-Walled Ductile Iron Castings

Electrolytic polishing of compacted graphite iron for revealing subsurface graphite

The blocks, provided by Tupy S.A., were manufactured in compacted graphite iron. The class of this material is the GJV450 (ISO 16112). After casting, the cylinders were honed. The applied honing process was the plateau type. For this process, diamond tips

Manuscript containing figures

Microstructural characteristics of cast irons such as graphite shape and distribution, as well as the metal matrix microstructure depend on chemical composition, casting process, e.g. cooling condition [1, 2]. For ductile iron with nodular graphite particles, the

Influence of the furfuryl moulding sand on the flake graphite formation in the surface layer of ductile iron castings

Influence of the furfuryl moulding sand on the flake graphite formation in the surface layer of ductile iron castings M. Holtzer1, R. Dańko1 and M. Grny1 1AGH-University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland The results of

Quantification of Casting Skin in Ductile and Compacted

2015/11/5Quantification of Casting Skin in Ductile and Compacted Graphite Irons and Its Effect on Tensile Properties D. Stefanescu 1, S. Wills 1, J. Massone 1 F. Duncan 2 International Journal of Metalcasting volume 2, pages 7–28(2008)Cite this article

Characterization and modeling of the mechanical

2017/12/21Two ductile iron grades of GJS-500-7 and GJS-500-14, with compositions presented in Table 1 were cast. The GJS-500-7 was cast in one batch. The grade GJS-500-14 (high silicon ductile iron) was cast in two batches one without and one with the addition of 160 ppm Antimony (Sb) named as GJS-500-14 and GJS-500-14(Sb), respectively.. Sb was added to investigate its effect on the

Thin

From the point of view of economics and ecology, thin-wall ductile iron (TWDI) castings can compete in terms of mechanical properties with the light castings made of aluminum alloys. This article discusses the effect of technological factors on the cooling rate and physicochemical state of the liquid metal for preparing thin-wall castings with good mechanical properties and performance while

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