Effect of the percentage carbon equivalent on the nodule characteristics, density and modulus of elasticity of ductile cast iron

✍ Scribed by Nabil Fatahalla; Hani Abd Al Hakim; Aly Abo-El-Ezz; Moenes Mohamed

• Publisher: Springer
• Year: 1996
• Tongue: English
• Weight: 597 KB
• Volume: 31
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00355883

✦ Synopsis

Successful melting and Mg treatment were conducted using a vortex unit which produced spheroidal graphite (SG) Fe ingots having a percentage carbon equivalent (%CE) ranging from 3.782 to 5.240. Microstructure examination revealed graphite nodules embedded in a white matrix (unetched condition). The variation of %CE proved to have a pronounced effect on the nodule characteristics. The nodule count showed a maximum value at %CE of 4.613. For metal-mould ingots it reached a value of 1584 nodulesmm -2, while for sand-mould ingots it reached a value of 970 nodulesmm-2 Nodule size was found to be inversely proportional to the nodule count for both sand-and metal-mould ingots. The nodularityof all ingots was, in general, higher than 95%. The density of SG Fewas found to decrease gradually (at %CE =3.782) from 7242 to 6969 kg m -3, The modulus of elasticity (E) showed a boat-like curve having minimum values of 189 and 192 GPa for the sand and metal moulds, respectively.