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通过理论分析Ti2O3、TiN在430铁素体不锈钢中的形成规律,提出了凝固前沿形成Ti2O3+TiN复合核心所需的Ti、Al、O和N含量.根据该成分要求,在真空感应炉中进行实验得到铸锭,制备金相试样在扫描电镜(SEM)和透射电镜(TEM)上观察析出物的特征.通过SEM发现,析出物细小弥散分布,尺寸约为2μm.从形貌上看,它由两层组成,氮化钛围绕氧化钛析出.通过析出物的TEM衍射花样进一步确认,析出物的中心层为Ti2O3,外层为TiN.合理控制钢液成分,即使在较低钛含量时也可以形成Ti2O3+TiN的复合核心.
The formation regularity of Ti2O3 and TiN in 430 ferritic stainless steel was theoretically analyzed, and the contents of Ti, Al, O and N needed to form Ti2O3 + TiN composite core at the front of solidification were proposed. According to the requirement of the composition, The ingot was obtained and the characteristics of the precipitates were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The SEM results showed that the precipitates were finely dispersed and distributed with a size of about 2μm.From the morphology, It consists of two layers, titanium nitride around the titanium oxide precipitated by TEM diffraction patterns further confirmed that the precipitates of the central layer of Ti2O3, the outer layer of TiN reasonable control of molten steel composition, even at lower titanium content It is also possible to form a composite core of Ti2O3 + TiN.