Surface decarburization is a loss of carbon in the skin of
the material. Favoring factors are high temperatures and larger quantities of oxygen
in the atmosphere. Characteristics for a surface decarburization are increased
amounts of ferrite, reduction of the amount of carbides, other transformation microstructure
or also lamellar pearlite at spheroidised hypereutectoid steels. Decarburization
has a negative influence on the hardenability in this area. The following example
has been carried out at a sample out of 1.1213 (Cf53).