50t EAF-AOD-LF-10t铸锭流程AISI 321不锈钢含钛夹杂物演变行为
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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,Ti_2O_3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·Al_2O_3,也有少量的TiOx-MgO-Al_2O_3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。
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 Ti_2 O_3 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 · A1203 or with minor core TiOx-MgO-Al_20_3.Moreover,the stable diagram of TiAl-0 and Ti-N in the liquid steel and precipitation of TiN during solidification were also calculated by thermodynamic software Factsage.
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 Ti_2 O_3 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 · A1203 or with minor core TiOx-MgO-Al_20_3.Moreover,the stable diagram of TiAl-0 and Ti-N in the liquid steel and precipitation of TiN during solidification were also calculated by thermodynamic software Factsage.
引文
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[2]Kong J P,Kim D U,Kang C Y.Effect of Ti Contents and Welding Current on the Mechanical Properties of Electrical Resistance Spot Welds in Complex-Phase Steel Sheets[J].Journal of the Korean Institute of Metals and Materials,2014,52(4):307-317.
[3]Nakajima K,Hasegawa H,Khumkoa S,et al.Effect of Catalyst on Heterogeneous Nuclea-tion in Fe-Ni-Cr Alloys[J].ISIJ Int,2006,46(6):801-806.
[4]陆世英.不锈钢[M].北京:原子能出版社,1995.
[5]Gao Y,Sorimachi K.Formation of Clogging Materials in an Immersed Nozzle During Continuous Casting of Titanium Stabilized Stainless Steel[J].ISIJ Int.1993,33(2):291.
[6]Nunnington R C,Sutcliffe N.The Steelmaki-ng and Casting of Ti Stabilized Stainless Ste-els//59 th Electric Furnace Conference and 19 th Process Technology Conference Procee-dings[C].Warrendale,2001:361.
[7]Zhen H G,Chen W Q.Investigation on CaO-TiO_2 type Clogging of SEN in Continuous Casting Ti-bearing Stainless Steel[J].Steelmaking,2006,22(3):35.
[8]孙彦辉,白雪峰,殷雪,等.321不锈钢小方坯浸入式水口堵塞研究[J].工程科学学报,2016,38(s1):109-118.
[9]Bale C W,B6lisle E,Chartrand P,et al.FactSage Thermochemical Software and Databases-Recent Developments[J].Calphad,2009,33(2):295.
[10]蔡开科.连铸坯质量控制[M].北京:冶金工业出版社,2010.