高于此点，由于超过共析点钢完全由珠光体和退火状态的渗碳体组成，硬度增加并不多。
Above this point the hardness can be increased only slightly, because steels above the eutectoid point are made up entirely of pearlite and cementite in the annealed state.
如图2.1所示的简化铁碳状态图将焦点集中在共析区，这对理解钢的性能和处理是十分有用的。
A simplified diagram, such as the one in Fig. 2.1, focuses on the eutectoid region and is quite useful in understanding the properties and processing of steel.
钢中珠光体转变属典型的扩散型共析转变。
Pearlitic transformation in steel is a typical diffusion eutectoid transition.
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