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).

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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).

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