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Characterization of inclusions in spring steels using light and scanning electron microscopy
Bytyqi, Arsim ; Jenko, Monika, metalurginja
This seminar first reviews the sources of inclusions in steel including both indigenous and exogenous inclusions, focusing on reoxidation, slag entrainment, inclusion agglomeration in lining etc. In ...order to inspect the quality of spring steel characterization of inclusions is studied. Principal factor that decides high-grade steel quality depends on size, shape, distribution of inclusions in steel. In this seminar, the determination of inclusions, size, distribution, composition, and steel cleanliness for the spring steel are studied by the light microscopy and scanning electron microscopy. The experiments with spring steel showed that the difference in inclusion content between samples is maintained but reduced. It was also established that first sample contains more inclusions than the second one, however the difference is not very pronounce. To control the spring steel quality in means of inclusions content ultrasonic and light microscopy shall be applied which allows controlling larger area. When new steel or new production route is introduced, then some more sophisticated analytical techniques should be applied, for instance SEM/EDS, AES or EBSD. Finally this seminar reviews operating practices to improve steel cleanliness and to build a new method for determination of inclusions by using advanced techniques.
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