During intercritical annealing, austenite forms in pearlite area firstly and cementite particles in ferrite grains and at boundaries are also transformed into austenite island.

• 双相区退火过程中，奥氏体首先在珠光体处形成，原铁素体晶界与晶内的碳化物颗粒也形成奥氏体岛。