1. 
   ledeburite
   The eutectic of the iron-carbon system, the constituents of which are austenite and cementite. The austenite decomposes into ferrite and cementite on cooling below the temperature at which transformation of austenite to ferrite or ferrite plus cementite is completed.
   Found op http://www.encyclo.co.uk/local/20742
   
   
2. 
   Ledeburite
   In iron and steel metallurgy, ledeburite is the eutectic that results when some forms of molten iron solidify. It is a type of metallographic structure in the Fe-C phase diagram, not properly a type steel as the C level is too high and in proper condition graphite would be formed and grey cast iron...
   Found op http://en.wikipedia.org/wiki/Ledeburite
   
   
3. 
   ledeburite
   The eutectic of the iron-carbon system, the constituents of which are austenite and cementite. The austenite decomposes into ferrite and cementite on cooling below the temperature at which transformation of austenite to ferrite or ferrite plus cementite is completed
   Found op http://www.encyclo.co.uk/local/21115
   
   

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