Ledeburite

v • d • e alloy phases
Austenite (γ-iron; hard) Bainite Martensite Cementite (iron carbide; Fe₃C) Ledeburite (ferrite - cementite eutectic, 4.3% carbon) Ferrite (α-iron, δ-iron; soft) Pearlite (88% ferrite, 12% cementite) Spheroidite
Types of Steel
Plain-carbon steel (up to 2.1% carbon) Stainless steel (alloy with chromium) HSLA steel (high strength low alloy) Tool steel (very hard; heat-treated)
Other Iron-based materials
Cast iron (>2.1% carbon) Wrought iron (almost no carbon) Ductile iron

In iron and steel steel solidify.

It is named after the metallurgist Karl Heinrich Adolf Ledebur (1837-1916). He was the first professor of metallurgy at the Bergakademie Freiberg. He discovered ledeburite in 1882.

Ledeburite arises when the carbon content is between 2.06% and 6.67%. The eutectic mixture is 4.3% carbon. Its melting point is 1147°C. At 4.3% carbon the metal becomes 100% ledeburite. Ledeburite is a phase mixture, of cementite.

Ledeburite has two forms: Ledeburite I and Ledeburite II.

Ledeburite I (close below 1147°C) is made of cementite.

Ledeburite II (at ambient temperature) is composed of martensite can develop.

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