Features crystallographic relations between the lattices of the primary and eutectoid ferrite

By diffraction microscopy and micro diffraction shows that in 8 cases out of a hundred and between eutectoid ferrite and doevtektoidnyh no limits. In eutectoid ferrite grains can be located up to six elementary colonies cementite. Proposed elementary called pearlite colony formation in which ferrite and cementite are single crystals, conjugated to orientation relationship Isaycheva or Pietsch.