Thermal Analysis of the Formation of Chunky Graphite during Solidification of Heavy-section Spheroidal Graphite Iron Parts - Archive ouverte HAL Access content directly
Journal Articles ISIJ international Year : 2009

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

Jon Sertucha
  • Function : Author
Ramon Suarez
  • Function : Author
Iker Asenjo
  • Function : Author
Peio Larrañaga
  • Function : Author
Inaki Ferrer
  • Function : Author
Susana Armendariz
  • Function : Author

Abstract

Analysis of cooling curves recorded at the centre of large blocks cast with near-eutectic spheroidal graphite cast irons prone to give chunky graphite has been checked against microstructure observations. It has been observed that solidification proceeds totally at temperatures lower than the stable eutectic temperature and the following solidification sequence could be proposed: 1) nucleation of primary graphite in the liquid; 2) initial eutectic reaction processing by growth of austenite-like dendrites encapsulating the primary nodules; 3) bulk eutectic reaction related to nucleation and then growth of CHG cells and of secondary nodules, these latter giving spheroidal graphite eutectic cells. It was found that the maximum recalescence during the eutectic reaction first increases with the volume of the block affected by chunky graphite, and then decreases when most of the material is affected. Interestingly enough, a relationship between the volume of the blocks affected by CHG and the recalescence measured on TA cups has been observed.
Fichier principal
Vignette du fichier
sertucha_2880.pdf (1.47 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

hal-03476705 , version 1 (13-12-2021)

Identifiers

Cite

Jon Sertucha, Ramon Suarez, Iker Asenjo, Peio Larrañaga, Jacques Lacaze, et al.. Thermal Analysis of the Formation of Chunky Graphite during Solidification of Heavy-section Spheroidal Graphite Iron Parts. ISIJ international, 2009, 49 (2), pp.220-228. ⟨10.2355/isijinternational.49.220⟩. ⟨hal-03476705⟩
14 View
16 Download

Altmetric

Share

Gmail Facebook X LinkedIn More