下珠光体区停留促进贝茵体的形核过程。
Holding in the lower pearlite range accelerates subsequent transformation to bainite.
完全硬化区由细小针状马氏体、残余奥氏体和少量点状碳化物组成，过渡区由马氏体和回火索氏体（珠光体）组成；
The completely hardening region is composed of fine acicular martensites, residual austenites and a few dot-like carbonides and the transition region is made up of martensites and sorbites (pearlite).
认为，中温区的贝氏体相变带有珠光体分解和马氏体相变的双重特征，具有过渡性。上贝氏体转变与珠光体分解有着本质上的区别，但又有密切的联系；
The results show that bainite phase transformation in the middle temperature area is transitive, and it has double character of the pearlite decomposition and the martensite transformation.
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