scholarly journals Thermal Analysis of the Formation of Chunky Graphite during Solidification of Heavy-section Spheroidal Graphite Iron Parts

2009 ◽  
Vol 49 (2) ◽  
pp. 220-228 ◽  
Author(s):  
Jon Sertucha ◽  
Ramón Suárez ◽  
Iker Asenjo ◽  
Peio Larrañaga ◽  
Jacques Lacaze ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Spheroidal Graphite ◽  
Spheroidal Graphite Iron ◽  
Heavy Section ◽  
Chunky Graphite

scholarly journals Effect of Si and Ni Addition on Graphite Morphology in Heavy-Section Spheroidal Graphite Iron Parts

2018 ◽  
Vol 925 ◽  
pp. 70-77 ◽  
Author(s):  
Branko Bauer ◽  
Ivana Mihalic Pokopec ◽  
Mitja Petrič ◽  
Primož Mrvar
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Metallographic Analysis ◽  
Spheroidal Graphite ◽  
Ni Content ◽  
Heavy Section ◽  
Graphite Morphology ◽  
Ni Addition ◽  
Chunky Graphite ◽  
Si Content

Metallographic analysis is applied to the study of the chunky graphite morphology in heavy-section castings of spheroidal graphite cast irons. Three castings with different Si and Ni content were prepared. Three positions in casting from the edge to the centre, with different cooling rates, were chosen for microstructure observation. The effect of the Si and Ni content on the graphite morphology and mechanical properties of heavy-section spheroidal graphite cast iron parts were investigated. Cerium containing commercial inoculant was used for in-stream inoculation. Chunky graphite area was estimated in micro-and macrostructure. Mechanical properties were determined on tensile test bars taken from the centre of the casting. Macro-and microstructure examination showed that the castings with high Si-content and Ni addition had chunky graphite present, while the castings produced by use of low Si and Ni containing charge had no chunky graphite. High Si-content is strong chunky graphite promoter, especially in castings with slow cooling rate. Ni addition also promotes chunky graphite formation, but only in thermal centre of the casting (where the cooling rate is the lowest). The elongation is severely lowered when chunky graphite appears in the microstructure.

scholarly journals Chunky Graphite in Low and High Silicon Spheroidal Graphite Cast Irons–Occurrence, Control and Effect on Mechanical Properties

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5402
Author(s):  
Jon Sertucha ◽  
Garikoitz Artola ◽  
Urko de La Torre ◽  
Jacques Lacaze
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Rare Earths ◽  
Room Temperature ◽  
Spheroidal Graphite ◽  
Cast Irons ◽  
Charge Materials ◽  
Heavy Section ◽  
Chunky Graphite ◽  
High Silicon

Chunky graphite appears easily in heavy-section spheroidal graphite cast irons and is known to affect their mechanical properties. A dedicated experiment has been developed to study the effect of the most important chemical variables reported to change the amount of chunky graphite, namely the content in silicon and in rare earths. Quite unexpectedly, controlled rare earths contents appear beneficial for decreasing chunky graphite when using standard charge materials. Tin is shown to decrease chunky graphite appearance and it is evidenced that this effect is not related to rare earths. Finally, the effect of tin and antimony are compared and it is noticed that both suppress chunky graphite but also lead to some spiky graphite when no rare earth is added. Chunky graphite negatively affects the room temperature mechanical properties, though much more in the case of low silicon spheroidal graphite cast irons than in high silicon ones. Spiky graphite has been found to be much more detrimental and should thus be avoided.

Effect of mould inoculation on formation of chunky graphite in heavy section spheroidal graphite cast iron parts

2007 ◽  
Vol 20 (6) ◽  
pp. 319-324 ◽  
Author(s):  
I. Asenjo ◽  
P. Larranaga ◽  
J. Sertucha ◽  
R. Suárez ◽  
J.-M. Gómez ◽  
...  
Keyword(s):  
Cast Iron ◽  
Spheroidal Graphite ◽  
Heavy Section ◽  
Spheroidal Graphite Cast Iron ◽  
Graphite Cast Iron ◽  
Chunky Graphite

scholarly journals Experimental Evidence for Metallurgical Modification Associated to Chunky Graphite in Heavy-Section Ductile Iron Castings

2012 ◽  
Vol 6 (1) ◽  
pp. 35-42 ◽  
Author(s):  
J. Lacaze ◽  
I. Asenjo ◽  
S. Méndez ◽  
J. Sertucha ◽  
P. Larrañaga ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Ductile Iron ◽  
Iron Castings ◽  
Heavy Section ◽  
Chunky Graphite

Defects Reduction in Spheroidal Graphite Iron Casting Process of a Jackscrew Manufacturer

2021 ◽  
Vol 891 ◽  
pp. 174-182
Author(s):  
Supachart Muangyai ◽  
Parames Chutima
Keyword(s):  
Six Sigma ◽  
Process Capability ◽  
Casting Process ◽  
End Users ◽  
Spheroidal Graphite ◽  
Iron Casting ◽  
Spheroidal Graphite Iron ◽  
Six Sigma Approach

This research focused on defects reduction in spheroidal graphite iron casting process of a jackscrew manufacturer in which graphite nodularity was lower than a given specification (75%). This situation could lead to serious issues and accident to end-users. The Six Sigma approach of DMAIC was employed to identify and eliminate the problems. The result obtained after implementing the Six Sigma showed that the process capability was improved from-0.47 to 2.04, and the average per cent graphite nodularity was increased significantly from 61.49% to 86.43%.

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