ALLOYING ELEMENTS VARIANT ON THE DEVELOPMENT OF ANTIMONY MODIFIED COMPACTED GRAPHITE IRON USING ROTARY FURNACE

In this study, the production and properties evaluation of compacted graphite iron (CGI) were experimented. Sand casting was employed in producing the CGI alloys using rotary furnace to melt the charges. Rod pattern was used to produce the CGI alloy samples with different alloying treatments. Alloy...

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Bibliographic Details
Published in:Annals of Faculty Engineering Hunedoara 2021-05, Vol.19 (2), p.13-22
Main Authors: Saka, Sheriff O, Seidu, Saliu O, Akinwekomi, Akeem D, Oyetunji, Akinkbi
Format: Article
Language:English
Subjects:
Alloying elements
Alloys
Aluminum
Antimony
Carbon
Chemical analysis
Chemical composition
Chemistry
Compacted graphite iron
Cooling
Copper
Elongation
Engines
Graphite
Iron silicide
Magnesium
Mechanical properties
Mechanical tests
Metallurgy
Microstructure
Modulus of elasticity
Morphology
Optical microscopes
Pearlite
Process controls
Rotary furnaces
Sand casting
Silicon
Sulfur
Titanium
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Summary:In this study, the production and properties evaluation of compacted graphite iron (CGI) were experimented. Sand casting was employed in producing the CGI alloys using rotary furnace to melt the charges. Rod pattern was used to produce the CGI alloy samples with different alloying treatments. Alloy C is the unmodified CGI alloys while alloy A1, A2 and A3 are antimony Sb-modified CGI alloys at varying addition of 0.003, 0.006 and 0.05 wt% respectively. Mg and Ce FeSi treated alloy C; and Mg, Ce, Al, Cu, Sb - modified alloys were all subjected to mechanical tests according to ASTM standards. The chemical compositions were obtained using spectrometry analyzer. The microstructure of the samples was viewed using metallurgical optical microscope and analysed with image analyzer. The result of the chemical analysis of the CGI alloys produced solidified as hypoeutectic (for alloy samples C and A1) and hypereutectic (for A2 and A3) which showed a low silicon (1.66 - 1.76) % and high sulphur (0.110 - 0.147) contents of their respective Si/C and Mg/S ratios. The microstructure details revealed that increased antimony addition increases pearlite content and modified the compacted graphite particles from thick, short, and wormy - like with round - ended edges to less thick, short, wormy and crab - like graphite with needle and rough edges in pearlitic matrix interspersed with carbide. Mechanical properties (tensile, % elongation and elastic modulus) were improved as antimony addition increases particularly for alloy A1 while lowest values were within alloys C and A1. Alloy C has the highest average hardness of 87.4 HRA while Alloy A1 possessed the least value (83.2 HRA). Hence, alloy A2 has the best overall property which is between Grade 300 - 350 according to ASTM A842 - 85.
ISSN:1584-2665
2601-2332