The Study of the Role of Fullerene Black Additive during the Modification of Ductile Cast Iron

2017 ◽  
Vol 891 ◽  
pp. 235-241
Author(s):  
Nelya Amanjolovna Shamelkhanova ◽  
Alma Muratbekovna Uskenbayeva ◽  
Alexander Tikhonovich Volochko ◽  
Sergey Pavlovich Korolyov
Keyword(s):  
Cast Iron ◽  
Microstructural Analysis ◽  
Ductile Cast Iron ◽  
High Potential ◽  
Structure And Properties ◽  
Globular Graphite ◽  
Fullerene Black ◽  
Graphitization Degree ◽  
Modifying Additive

The use of fullerene black (FB) as effective modifying additive to cast iron is substantiated by its high potential. Research of nanoadditives to modifier has shown an increase in graphitization degree and the forming of favorable morphology of globular graphite. The results of microstructural analysis and tribological trials have confirmed an improvement of ductile cast iron’s structure and properties when treated with FB-additive.

scholarly journals Investigation of the Nodularisation Propensity of Calcined Cashew-Nut Shell-Ash in Cast-Iron Melt Graphite

2021 ◽  
Vol 18 (1) ◽  
pp. 1-8
Author(s):  
O.I. Sekunowo ◽  
J.O. Ugboaja ◽  
J.A. Tiamiyu
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Ductile Iron ◽  
Microstructural Analysis ◽  
Ductile Cast Iron ◽  
Cashew Nut ◽  
Melt Treatment ◽  
Master Alloys ◽  
Molten Cast Iron ◽  
Cashew Nut Shell

Production of ductile iron using ferrosilicon-magnesium master alloy in melt treatment is currently fraught with challenges bothering on cost and availability. In this study the suitability of cashew nut shells ash (CNSA) as a viable alternative to magnesium master alloys employed in the treatment of molten cast iron for enhanced mechanical properties was studied. The carbonized CNSA used varied from 2-10 wt. % to treat different heat batches; CA1-CA5 containing varied amount of CNSA, CaO and FeSi in the molten cast iron. The cast samples were subjected to both mechanical characterisation (tensile, hardness and impact) and microstructural analysis using Instron electromechanical machine, impact tester and scanning electron microscope (SEM) coupled with energy dispersive spectroscope (EDS). Results show that the 8 wt. % CNSA addition demonstrated the best mechanical properties comparable to ASTM A536 ferritic ductile cast iron. Specifically, the 8 wt. % CNSA cast samples exhibited 433 MPa tensile strength, 144HRC hardness and ductility of 14.7%. Contributions to improved mechanical properties may be attributed to the development of sufficient fractions of graphite nodules during melt treatment with CNSA. These outcomes are a boost both to the production of quality ductile irons and a cleaner environment. Keywords: Nodularisation, ductile-iron, cashew-nut, ferrosilicon-magnesium alloy, mechanical properties

The Role of Alloy Design in Semi-Solid Casting of Ductile Iron Processed by Inclined Cooling Plate

2010 ◽  
Vol 457 ◽  
pp. 287-292 ◽  
Author(s):  
Bashir Heidarian ◽  
Mahmoud Nili-Ahmadabadi ◽  
Marzyeh Moradi
Keyword(s):  
Cast Iron ◽  
Reliable Method ◽  
Ductile Cast Iron ◽  
Forming Process ◽  
Plate Method ◽  
Equilibrium Conditions ◽  
Cooling Plate ◽  
Solidification Range ◽  
Semi Solid

The inclined Cooling Plate process can be considered as a reliable method for the production of semi-solid ductile cast iron. By utilizing aforesaid method, the main limitation of common semi-solid methods, i.e. Mg fading, will be eliminated. The present research is intended that the importance of alloying design through the inclined cooling plate method and its profound effect on obtaining the optimum solidification range for thixo-forming process have been illustrated. The optimization of solidification range for thixo-forming process has been gained by the simulation in both equilibrium and non-equilibrium conditions. Afterwards the alloy selection has been performed amongst several alloying composition with a view to their effect on the thixo-forming process and austempering.

scholarly journals NANOSTRUCTURAL PROCESSES OF MELTING AND MOULDING OF CAST IRON WITH GLOBULAR GRAPHITE

2017 ◽  
pp. 45-48
Author(s):  
E. I. Marukovich ◽  
V. Yu. Stetsenko
Keyword(s):  
Cast Iron ◽  
Adsorbed Oxygen ◽  
Globular Graphite ◽  
Physical And Chemical

It is shown that melting and molding of cast iron with globular graphite are complex physical and chemical nanostructural processes. The major role in these processes is played by the centers of crystallization of dendrites of graphite, graphite nanocrystals, the dissolved and adsorbed oxygen. The role of the modifying ligature of FeSiMg is reduced generally to essential decrease of concentration of the adsorbed oxygen and an enrichment of fusion by the centers of crystallization of graphite dendrites. 

Oxygen State Forms in Cast Iron and their Effect on Graphite Crystallization

2010 ◽  
Vol 457 ◽  
pp. 43-47 ◽  
Author(s):  
Edis B. Ten
Keyword(s):  
Cast Iron ◽  
Dissolved Oxygen ◽  
Solidification Process ◽  
Structure And Properties ◽  
Forming Process ◽  
Graphitization Degree ◽  
Power Increase ◽  
Oxygen State ◽  
Metallic Inclusions ◽  
Original Interpretation

Oxygen influence on the structure and properties of cast iron is contradictory and depends on its state. It is supposed that the chemically combined oxygen exists into molten metal as Non-metallic inclusion, and it acts as a Graphite crystallization substrate and also increases graphitization degree of the cast iron. Dissolved oxygen deactivates the potential graphitization centers that are why cast iron chill tendency is increased. At the same time, according to experimental results, the more cast iron is saturated by oxygen, the higher its tendency for graphitization modification. In this study, the influence of the oxygen state on graphite forming process during the cast iron crystallization is considered and the details of its action on the graphite crystallization at different stages of casting solidification process are also represented. It is shown that oxygen, initially present in molten melt in chemically combined state, does not have a significant effect on the Cast Iron crystallization. At the same time, the dissolved oxygen in non-modified cast iron causes chill, but in modified Cast Iron the over-equilibrium dissolved Oxygen content promotes graphitizing crystallization by forming dispersed pre-crystallizing (“fresh”) non-metallic inclusions in liquid cast iron. On the basis of these concepts, the original interpretation of several well-known facts concerning graphitization modifying is presented. These facts have been widely discussed at the present time, and there is a great number of contraversal opinions on this account. Particularly, the new aspects of the damping effect of the graphitization modifying of the cast iron have been discussed. The causes of ferrosilicon graphitizing power increase by addition of the aluminum, calcium, barium, rare-earth metals and other powerful elements-deoxidizers to it are shown. The additional factors of high effectiveness of the in-mold graphitization modifying of cast iron are presented also

The Influence of the Residual Mg Content in the Ductile Cast Iron on the Formation Law of Spherodial Graphite

2011 ◽  
Vol 415-417 ◽  
pp. 907-914 ◽  
Author(s):  
Zhi Qing Shen ◽  
Hong Liang Zheng ◽  
Tong Tong Li ◽  
Yan Xu ◽  
Rong Fu Xu ◽  
...  
Keyword(s):  
Cast Iron ◽  
Ductile Iron ◽  
Metallic Matrix ◽  
Ductile Cast Iron ◽  
Holding Time ◽  
Simple Substance ◽  
Similar Composition ◽  
Ratio Change ◽  
Mg Content

The residual Mg content ,spherodize ratio and nuclei of spherodial graphites(abbreviated SG) were studied by casting a series of similar composition ductile iron rods and white samples with different holding time of spheroidizing. The results indicate that the residual Mg content in the ductile iron was less and less as the holding time grows ,which causing the morphology of graphites transfer from spherodial to oval. Spherodize ratio change law is not continuous as increasing the residual Mg content which is divided at the 0.02%. The morphologies of nuclei of SGs core are typical examples of the highly magnified structure of spherical and irregular polygons; the diameters are about 0.5~2μm, consisting of (Mg, Ca)S along with CeO2and MgO. Disregistry δ between the nucleus compounds and graphite are low,which indicates that nucleus compounds are good nucleating site for SGs.The Mg element in nuclei of SG just act as nucleation substrates.it is the Mg which maybe simple substance in the metallic matrix that act as the role of spherodizer determines the graphite shape.

The influence of humidity and the role of debris in the unlubricated wear of ductile cast iron against alumina

Wear ◽  
1994 ◽  
Vol 177 (2) ◽  
pp. 151-157 ◽  
Author(s):  
C. Papaphilippou ◽  
M. Vardavoulias ◽  
M. Jeandin
Keyword(s):  
Cast Iron ◽  
Ductile Cast Iron ◽  
Unlubricated Wear

scholarly journals The Role of Bacteria in the Graphitic Corrosion of Buried Ductile Cast Iron Pipes

1991 ◽  
Vol 40 (12) ◽  
pp. 806-813 ◽  
Author(s):  
Komei Kasahara ◽  
Fumio Kajiyama ◽  
Kiyoshi Okamura
Keyword(s):  
Cast Iron ◽  
Ductile Cast Iron
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