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.
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。
It was found by experiments thatboron increased the growth rate of pearlite, both in hypoeutectoid and eutectoid steels.
硼有加速珠光体成长率的作用，无论在亚共析或共析钢中皆有同样的现象产生。
The resulting structure is a mixture of primary or pro-eutectoid ferrite (ferrite that formed above the eutectoid reaction) and regions of pearlite.
作为结果的组织结构是初步的共析铁素体(在共析反应前的铁素体)和部分珠光体的混合物。
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