Pearlite peak

Section of the pearlite in the TTT diagram of iron carbon alloys which projects in the shape of a peak and which can be shifted by means of alloy elements.

In this way, it is, for example, possible to extend the cooling time for thicker components by producing an alloy with copper, nickel, and molybdenum and to thus shift the pearlite peak towards the right.

However, a sufficient hold time in the area of the ausferrite must be ensured in order to allow for the austenite to stabilize.

Additional references:
Austenitic cast iron
Bainitic cast iron
Ferritic cast iron
Metal matrix of cast iron
Cast iron

  • Fig. 1: Pearlite peak which can be shifted towards the left by Cu, Ni and/or molybdenum thus being avoided during heat treatment of ausferritic cast iron (s. Bainitic cast iron)