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Explore the fascinating world of iron and steel through crystal structures and micrograph images showcasing different compositions such as pure iron, low-carbon steel, medium-carbon steel, high-carbon steel, and cast irons. Learn about the properties and applications of each type in human civilization.
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IRON and STEEL What is shown in the photo?
Atomium in Brussels • This building is a giant model of body-centered cubic crystalline latticeof iron – the main metal for human civilization (enlarged 165,000,000,000 times)
Crystalline structure of iron:unit cell • Body-centered cubic crystalline lattice (BCC)
Photomicrograph of iron: ferrite Commercially pure iron: less than 0.008 wt% C
Photomicrograph of low-carbon steel: ferrite and pearlite Steel used for various structural shapes and sheets: 0.15 wt% C
Photomicrograph of medium-carbon steel: ferrite and pearlite Steel used for various machine parts: 0.4 wt% C
Photomicrograph of high-carbon steel: pearlite Steel used for springs: 0.8 wt% C
Photomicrograph of high-carbon steel: pearlite and cementite cementite Tool steel: 1.2 wt% C
Photomicrograph of high-carbon steel: spheroid pearlite cementite ferrite Tool steelhaving a spheroid microstructure 1000x
Photomicrograph of grey cast iron: pearlite and graphite cementite Pearlitic grey cast iron: approximately 4.0 wt% C
Photomicrograph of cast irons nodular malleable gray white All cast irons contains between 3.0 and 4.5 wt% C