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与其它方法相比,在钢中加入微量Ti元素,不仅能有效的细化奥氏体晶粒,而且实行起来比较容易。本文通过对含微量钛钢的原始组织、奥氏体晶粒的粗化温度等进行试验研究的结果表明,含钛低碳钠比不含钛同一钢种的奥氏体晶粒被细化了,钛量在0.02～0.07％时,效果比较明显。由于钛的添加,会使钢中生成细小的TiN和TiC质点,它们具有阻止奥氏体晶粒长大的作用(即,使奥氏体晶粒粗化温度提高150℃以上)。由于钛原子的固溶及析出的钛的碳氮化物质点均能阻止再结晶,所以细化了再结晶后的奥氏体晶粒。当含钛量从0增加到0.14％时,奥氏体晶粒被细化两级左右。
Compared with other methods, adding a trace amount of Ti in steel can not only effectively refine austenite grains, but also make it easier to implement. In this paper, the experimental results of the austenite grain size and austenite grain size on the original microstructure of Ti-bearing steels indicate that the austenite grains with the same Ti-containing low-carbon sodium and the same steel without Ti are refined , The amount of titanium in the 0.02 ~ 0.07%, the effect is more obvious. Due to the addition of titanium, small TiN and TiC particles are formed in the steel, which have the effect of preventing austenite grain growth (ie, the austenite grain coarsening temperature is raised by more than 150 ° C). Recrystallization austenite grains are refined due to the solid solution of titanium atoms and the precipitation of titanium carbonitrides, both of which prevent recrystallization. When the amount of titanium increases from 0 to 0.14%, the austenite grains are refined by about two steps.