Abstract: Evolutionand formation of Ti-bearing inclusions in AISI 321 stainless steel in ignoring casting process was investigated. The industrial test results show that titanium oxidation occurs after Ti addition in LF process and the proportion of Ti₂O₃  in the average inclusions compositions increased along with the smelting process. The TiN inclusions observed were pure TiN and TiN with core MgO and MgO·Al₂0₃ or with minor core TiOx-MgO-Al₂O₃. Moreover,the stable diagram of Ti- Al-0 and Ti-N in the liquid steel and precipitation of TiN during solidification were also calculated by thermodynamic software Factsage.

摘要： 研究了模铸工艺生产的AISI 321不锈钢含钛夹杂物的演变。工业试验表明,LF喂钛线后,发生钛的氧化行为,随着冶炼过程的进行,Ti₂O₃在夹杂物平均成分中的比例逐渐升高,TiN主要以均质氮化钛和含芯氮化钛为主,含芯TiN核心成分为MgO及MgO·Al₂O₃,也有少量的TiO_x-MgO-Al₂O₃核心。通过热力学软件Factsage计算了钢水中Ti-Al-O、Ti-N稳定相图以及凝固过程TiN的析出行为。