Experimental Study on Two-dimensional and Three-dimensional Morphology Differences of Non-metallic inclusions in Aluminum Killed Steel

By taking non-metallic inclusions in aluminum killed steel as object of study,the advantages and disadvantages of metallography method and extraction method are comparatively used to observe the differences of the inclusions’two-dimensional and three-dimensional morphologies.As inclusions in the steel are extracted by organic solution（methanol as major dissolvent）,three-dimensional characteristics of clustering Al₂O₃ can be observed clearly.Compared with traditional metallography method,extraction method can extract the entire inclusions and perfectly observe the three-dimensional morphology,structure and external composition of the inclusions,which are valuable for effectively controlling inclusion morphologies and compositions and removing harmful inclusions.However,inner morphologies of inclusions can’t be observed by this method.On the contrary,by the metallography method,certain crosssections of inclusions can be observed with SEM,which is important for concluding the formation and transformation processes of inclusions.To sum up,reasonable integration of the two methods helps to obtain more detailed information about inclusions in steel,which can provide theoretical principles for controlling inclusions more effectively.