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Поддержка технологии

» Поддержка технологии

Чугун Состав

июнь 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. Компоненты сплава влияют на его цвет, когда ломаются: 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 “узелки” которые останавливают трещину от дальнейшего прогрессирования.

углерод (С) ranging from 1.8–4 wt%, and silicon (и) 1–3 wt% are the main alloying elements of cast iron. Iron alloys with less carbon content are known as steel. Хотя это технически делает троичной системе 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 (Самая низкая точка жидкости) системы железо-углерод, температура плавления, как правило, в диапазоне от 1,150 в 1,200 ° С (2,100 в 2,190 ° F), which is about 300 ° С (540 ° F) ниже точки плавления чистого железа.

Cast iron tends to be brittle, except for malleable cast irons. С его относительно низкой температурой плавления, хорошая текучесть, 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 (снижение использования), cylinder blocks and gearbox cases (снижение использования). It is resistant to destruction and weakening by oxidation.

Самый ранний чугунная дата артефактами в 5-м веке до н.э., and were discovered by archaeologists in what is now Jiangsu in China. Чугун использовался в древнем Китае для войны, сельское хозяйство, and architecture. During the 15th century, cast iron became utilized for artillery in Burgundy, Франция, 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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