- Ledeburite
In iron and steel
metallurgy , ledeburite is theeutectic that results when some forms of moltensteel solidify.It is named after the
metallurgist Karl Heinrich AdolfLedebur (1837–1916). He was the firstprofessor of metallurgy at theBergakademie Freiberg . He discovered ledeburite in1882 .Ledeburite arises when the carbon content is between 2.06% and 6.67%. The eutectic mixture of
austenite andcementite is 4.3% carbon, Fe3C:2Fe, with a melting point of 1147 °C.Ledeburite-II (at ambient temperature) is composed of
cementite -I with recrystallized secondary cementite (which separates fromaustenite as the metal cools) and (with slow cooling) ofpearlite . The pearlite results from theeutectoid al decay of the austenite that comes from the ledeburite-I at 723 °C. During swifter cooling,bainite can develop instead of pearlite, and with swift coolingmartensite can develop.External links
* [http://www.tf.uni-kiel.de/matwis/amat/mw1_ge/kap_8/advanced/t8_4_1.html Names and Steel]
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