CHAPTER 91.Ferrite is the name of the structure of a solid solution of steel at 1200 F that contains a very small percentage of carbon (perhaps 0.02% ).Assume that this steel has not been previously heat treated.2.Cementite is the name of the structure of iron at room temperature that contains 6.67% carbon. Assume that this metal has never heat treated.3.Pearlite is the name of the structure of a solid solution of steel at room temperature that contains 0.8% carbon. Assume that this steel has never heat treated.4.The carbon in a sample of pure pearlite approximately is 0.8%.5.Austenite is the structural form of steel that occurs only at elevated temperature .It is not magnetic.6.The structural will change back to ferrite and pearlite, when steel is slowly cooled from a high temperature to room temperature.7.Of the following types of iron-carbon which is the hardest: austenite, cementite, ,ferrite , or martensite ? It is martensite.
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