At 600 °C, peralite will form on the austenite grain boundaries, and grows into the austenite grains. Pearltie formation is a precipiation process. Pearlite is a combination of ferrite and cementite.

At 600 °C, peralite will form on the ferrite grain boundaries, and grows into the ferrite grains. Pearltie formation is not a precipiation process. Pearlite is a combination of austenite and cementite.

At 600 °C, peralite will form on the austenite grain boundaries, and grows into the austenite grains. Pearltie formation is a precipiation process. Pearlite is a combination of ferrite and bainite.

At 600 °C, peralite will form on the austenite grain boundaries, and grows into the austenite grains. Pearltie formation is not a precipiation process. Pearlite is a combination of ferrite and cementite.