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Ghisa Composizione

giugno 7, 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.

Cast iron tends to be brittle, except for malleable cast irons. Con il suo punto di fusione relativamente basso, buona fluidità, castability, excellent machinability, resistance to deformation and wear resistance, cast irons have become an engineering material with a wide range of applications and are used in pipes, machines and automotive industry parts, such as cylinder heads (utilizzo in declino), cylinder blocks and gearbox cases (utilizzo in declino). It is resistant to destruction and weakening by oxidation.

Il primo ghisa data di manufatti al 5 ° secolo aC, and were discovered by archaeologists in what is now Jiangsu in China. ghisa è stato utilizzato in Cina antica per la guerra, agricoltura, and architecture. During the 15th century, cast iron became utilized for artillery in Burgundy, Francia, and in England during the Reformation. The first cast-iron bridge was built during the 1770s by Abraham Darby III, and is known as The Iron Bridge. Cast iron is also used in the construction of buildings.

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