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Presentation transcript:

What is shown in the photo? IRON and STEEL What is shown in the photo?

Atomium in Brussels This building is a giant model of body-centered cubic crystalline lattice of 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)

Relationships between basic components

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 Tool steel: 1.2 wt% C

Photomicrograph of high-carbon steel: spheroid pearlite cementite ferrite Tool steel having 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