The most important subject in the steelmaking process is the control of non-metallic inclusions. Nonmetallic inclusions with a high melting point do not deform during a hot working process because they are relatively hard. Hence, the inclusion composition should be controlled in order to achieve a low melting point to prevent product defects. Therefore, an MnO-SiO 2-based inclusion is considered to be one of the preferred systems. Moreover, the heat treatment of austenitic stainless steel has been reported to influence the composition of MnO-SiO 2-type inclusions; these inclusions change into MnO-Cr 2O 3-type, MnO-Nb 2O 5-type, and MnO-V 2O 3-type inclusions. In this study, we investigated the influence of heat treatment on the composition of the inclusions in the martensitic stainless steel. In general, a scanning electron microscope-energy dispersive x-ray spectrometer (SEM-EDS) is used for the quantitative analysis of inclusions; however, SEM-EDS cannot simultaneously analyze a large number of inclusions. Therefore, a new technique using the SEM-EDS along with the image analysis software "Particle Analysis" was used for the chemical analysis and the size measurement of a large number of inclusions (hereafter abbreviated as the PA method). The heat-treatment-induced compositional change of the inclusions in martensitic stainless steel was evaluated by using both the analysis methods.
|出版ステータス||Published - 2011|
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