Both steel iron and cast iron have the structures of eutectoid, hypoeutectoid and hypereutectoid.
钢和铸铁都有共析、亚共析和过共析这三种组织。
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 results show that, in hypoeutectoid steels, deformation at medium temperature may fine the structure and improve the distribution of ferrite and pearlite greatly;
