高炉炉缸富钛保护层的解剖分析

通过对长期加钛护炉高炉的炉缸进行解剖获得了富钛保护层的样品,并推测了富钛保护层在高炉中的形成过程。研究发现Ti(C, N)晶粒最初从铁水中析出,然后通过晶界迁移在炉渣中长大,最后Ti(C, N)晶粒与熔渣和铁水一起凝结形成保护层。此外,采用酸蚀法观察了Ti(C, N)晶粒的微观形貌,发现Ti(C, N)晶粒表面相对平整且具有大量环形层状结构,另外还有少量立方体式堆砌形式存在,Ti(C, N)晶粒内部并不致密。

Dissection analysis of titanium rich protective layer in blast furnace hearth

Samples of the titanium rich protective layer were obtained by dissection of a BF hearth with long-term titanium addition for the furnace protection, and the formation process of titanium rich protective layer in the blast furnace was deduced. It was found that Ti(C,N) grains were precipitated from the molten iron initially and then grew up in the slag due to grain boundary migration between grains. Finally, Ti(C,N) grains with slag and iron were consolidated to form a protective layer. Furthermore, the 3D morphology of precipitated phase for Ti(C,N) was also observed by the acid attack method. It was found that the surface of Ti(C,N) grains was relatively flat and had a large number of annular layered structures. Besides, a small amount of Ti(C,N) grains were stacked with the cube form and had the loose internal structure.