利用光学显微镜检测了抗拉强度超过标准上限的低碳钢的金相组织，试样中伪珠光体体积分数达到50%以上，明显高于正常组织中的珠光体体积分数，因此具有显著的珠光体强化效果；并且伪珠光体存在明显的退化现象。对比分析生产工艺后认为，层流冷却过程中对先共析铁素体析出的抑制以及终冷温度低于空冷的Ar1是产生这种退化显著的伪珠光体组织的必要条件。结合生产实践分析了影响先共析铁素体析出的因素。
The metallurgical structure of the specimens with higher strength is detected by optical microscope, and there is more than 50%pseudo-eutectoid pearlite in the specimens, resulting in an effect of remarkable pearlite strengthening. Con-clusion of comparative analysis of different process is that far more than balance content of pseudo-eutectoid pearlite can be gotten by inhibiting proeutectoid ferrite transformation and making final cooling temperature lower than the Ar1 of air cooling. The factors influencing the proeutectoid ferrite transformation during laminar cooling are discussed in this study.
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