Evaluation of Inclusion Characteristics in Low-Alloyed Steels by Mainly Using the PDA/OES Method
2015 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 55, no 10, 2173-2181 p.Article in journal (Refereed) Published
The characteristics of non-metallic inclusions (such as number, size and volume fraction) in liquid steel samples taken during ladle treatment and casting of industrial heats of two low-alloyed Ca-treated steel grades were evaluated by using the Pulse Distribution Analysis with Optical Emission Spectroscopy (PDA/OES) method. These results were compared to data obtained by Scanning Electron Microscope observations of inclusions after electrolytic extraction from steel samples (the EE method). It was found that the PDA/OES method can be used for a relative estimation of the homogeneity of the distribution of non-metallic inclusions in steel samples. Bottom and middle parts of the steel samples showed more homogeneous results with respect to the characteristics of the investigated Al2O3, CaO-Al2O3 and CaO-Al2O3-CaS inclusions. The numbers of inclusions in the size ranges 2.0-5.7 mu m and 1.4-5.7 mu m in samples taken before and after a Ca addition, respectively, showed a relatively good agreement between both methods. Furthermore, the calculated volume fractions for inclusions in the size range 2-13 mu m obtained by the PDA/OES method agreed satisfactorily well with those obtained from the EE method. Finally, the minimum sizes of inclusions in steel samples, which can reliably be detected by the PDA/OES method, were estimated for steels with different concentrations of Al in steel and Al2O3 in inclusions.
Place, publisher, year, edition, pages
IRON STEEL INST JAPAN KEIDANREN KAIKAN , 2015. Vol. 55, no 10, 2173-2181 p.
IdentifiersURN: urn:nbn:se:kth:diva-167987DOI: 10.2355/isijinternational.ISIJINT-2015-172ISI: 000363914400017OAI: oai:DiVA.org:kth-167987DiVA: diva2:813687
Updated from manuscript to article.
QC 201512022015-05-252015-05-252015-12-02Bibliographically approved