Abstract

The TiN–MnS complex inclusions in Al-killed titanium alloyed interstitial free steel were extracted from the slabs using an electrolytic aqueous solution method. Scanning electron microscopy with energy spectroscopy analysis and an automatic scanning electron microscope were employed to analyze the size and distribution of TiN–MnS inclusions in the thickness direction of the slab. It was found that TiN–MnS complex inclusions were primarily concentrated in the 1/4 thickness direction from the inner and outer surfaces, and the size of the complex inclusions in the slab center was approximately 8 μm. TiN began to precipitate when the solidification rate reached 0.646–0.680 in the δ phase, and MnS would appear in the γ phase when the solidification rate exceeded 0.450 through thermodynamic analysis. Also, the formation mechanism of the complex TiN–MnS was investigated under a crystal structure during solidification.

Graphic Abstract

The TiN–MnS complex inclusions in Al-killed titanium alloyed interstitial free steel were extracted from the slabs using an electrolytic aqueous solution method. Scanning electron microscopy with energy spectroscopy analysis and an automatic scanning electron microscope were employed to analyze the size and distribution of TiN–MnS inclusions in the thickness direction of the slab. It was found that TiN–MnS complex inclusions were primarily concentrated in the 1/4 thickness direction from the inner and outer surfaces, and the size of the complex inclusions in the slab center was approximately 8 μm. Due to the similar plane of atoms ((100)TiN||(100)MnS and [001]TiN||[001]MnS) and a semi coherent interface between TiN and MnS, a series of edge dislocations would provide a comfortable accommodation for misfits parallel to the interface.

中文翻译：

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TiN-MnS复合夹杂物在铝杀死钛合金间隙自由钢中的提取，分布和析出机理

摘要

使用电解水溶液法从铝坯中提取了铝镇静的钛合金无间隙钢中的TiN-MnS复合夹杂物。采用能谱分析的扫描电子显微镜和自动扫描电子显微镜分析了板坯厚度方向上TiN-MnS夹杂物的尺寸和分布。研究发现，TiN-MnS复合夹杂物主要集中在内表面和外表面的1/4厚度方向上，平板中心的复合夹杂物尺寸约为8μm。通过热力学分析，当凝固速率在δ相达到0.646-0.680时，TiN开始沉淀；当凝固速率超过0.450时，在γ相中出现MnS。还，

图形摘要

使用电解水溶液法从铝坯中提取了铝镇静的钛合金无间隙钢中的TiN-MnS复合夹杂物。采用能谱分析的扫描电子显微镜和自动扫描电子显微镜分析了板坯厚度方向上TiN-MnS夹杂物的尺寸和分布。研究发现，TiN-MnS复合夹杂物主要集中在内表面和外表面的1/4厚度方向上，平板中心的复合夹杂物尺寸约为8μm。由于原子（（100）TiN ||（100）MnS和[001] TiN || [001] MnS）的平面相似以及TiN和MnS之间的半相干界面，一系列边缘位错将提供舒适的适应性与接口平行的错位。