Period of time until the appearance of pearlite in the TTT diagram of iron materials.
Long
pearlite periods are necessary in the production of ADI, for example,
so that during quenching of the austenitizing temperature, the pearlite
range (the pearlite peak) is not passed. In practical alloying, this is
usually achieved with alloy elements such as copper nickel and
molybdenum (s. Bainitic cast iron).
Additional references:
Pearlitization
Pearlite peak
Pearlitic influence factor
Pearlite point