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La Defination della Ghisa

giugno 5, 2017

Cast iron is a group of iron-carbon alloys with a carbon content greater than 2%. Its usefulness derives from its relatively low melting temperature. I costituenti delle leghe influenzano il suo colore quando fratturato: white cast iron has carbide impurities which allow cracks to pass straight through, grey cast iron has graphite flakes which deflect a passing crack and initiate countless new cracks as the material breaks, and ductile cast iron has spherical graphite “noduli” che fermano il crack da ulteriore progressione.

Carbonio (C) ranging from 1.8–4 wt%, and silicon (e) 1–3 wt% are the main alloying elements of cast iron. Iron alloys with less carbon content are known as steel. Mentre questo rende tecnicamente il sistema ternario Fe-C-Si, the principle of cast iron solidification can be understood from the simpler binary iron–carbon phase diagram. Since the compositions of most cast irons are around the eutectic point (punto più basso del liquido) del sistema ferro-carbonio, le temperature di fusione di solito vanno da 1,150 a 1,200 ° C (2,100 a 2,190 ° F), which is about 300 ° C (540 ° F) inferiore al punto di fusione del ferro puro.

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