Non-Metallic Inclusions and Acicular Ferrite in Low Carbon Steel

Young-Joo Oh, Sang-Yoon Lee, Jung-Soo Byun, J. Shim, Y. Cho
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引用次数: 24

Abstract

The formation of non-metallic inclusions with variations in various oxygen, nitrogen and titanium contents in low carbon steels has been studied. The relationship between the nature of non-metallic inclusions and the formation of acicular ferrite has been also investigated. It is found that the non-metallic inclusions observed in this study are mainly consist of Ti 2 O 3 and TiN together with a small amount of other complex oxides containing Mn and Si. It has been confirmed that Ti 2 O 3 and TiN play an important role in formation of acicular ferrite as a nucleation site and an austenite grain refiner, respectively. But it is not clear yet whether TiN acts as a nucleation site or not. It is also found that the volume fraction of inclusions is more effective than the type or size distribution of the non-metallic inclusions on the formation of acicular ferrite.
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低碳钢中的非金属夹杂物和针状铁素体
本文研究了低碳钢中不同氧、氮、钛含量下非金属夹杂物的形成。本文还研究了非金属夹杂物的性质与针状铁素体形成的关系。研究发现,本研究中观察到的非金属夹杂物主要由Ti 2o3和TiN组成,并含有少量其他含Mn和Si的复合氧化物。结果表明,ti2o3和TiN分别作为晶核位和奥氏体晶粒细化剂在针状铁素体的形成中起着重要作用。但目前尚不清楚TiN是否作为成核位点。夹杂物的体积分数比非金属夹杂物的种类和尺寸分布对针状铁素体的形成更有效。
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