共析组织是指固态金属自高温冷却时，从同一母相中同时析出，紧密相邻的两种或多种不同的相构成的组织。典型共析组织是片层状共析组织，包括片层状珠光体和球状珠光体。
最后讲述了珠光体生长的台阶机制及一些非铁碳合金的共析组织。
At the last, the steps mechanism of pearlitic growing and some eutectoid structures of non Fe-C alloys are pointed out.
这是因为该复合材料中形成了共析组织，且相界面增多，塑性变形抗力增大，硬质点数量增多。
The main reasons are the forming of eutectoid structure, the increase of the phase interfaces, the enhance of the plastic deformation resistance, as well as the increase of the hard particles.
钢和铸铁都有共析、亚共析和过共析这三种组织。
Both steel iron and cast iron have the structures of eutectoid, hypoeutectoid and hypereutectoid.
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