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

Materials

Garikoitz Artola¹  Jon Sertucha¹  Urkode La Torre¹  Jacques Lacaze² 

[1] Azterlan, Basque Research Technological Alliance, Aliendalde Auzunea 6, 48200 Durango, Spain;Centre Inter-Universitaire de Recherche et d’Ingénierie des Matériaux, CIRIMAT, Université de Toulouse, 4 Allée Monso, BP 44362, 31030 Toulouse, France;

关键词: spheroidal graphite;    chunky graphite;    spiky graphite;    cast iron;    tin;    antimony;   

DOI  :  10.3390/ma13235402

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown