軟鋼溶着金属中の酸化介在物について

概要

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Oxide inclusions in mild steel weld metal were investigated. Oxide inclusions isolated from mild steel weld metal by ultrasonic agitating dissolution method using I_2-CH_3OH solution were classified according to the size (5 microns over and under) by ultrasonic sieving method, and observed by optical microscope. Larger inclusion particles over 5 microns were analysed by electron-probe X-ray microanalyzer. It was found that inclusion particles over 5 microns were spheroidal (MnO・SiO_2, SiO_2, and (Mn, Fe)O), angular (SiO_2), lumpy (SiO_2), platy-shaped (SiO_2), prismatic (Al-silicate), pine needle- or stick-shaped (Ca-silicate), and string-shaped (Ca-phosphate) in shapes (and compostions). The amount of inclusion particles less than 5 microns was about 90% in oxide inclusions, and the greater portion of these was MnO・SiO_2, the size of which was about 1 micron. Ti-oxides which were confirmed by X-ray diffraction in inclusion particles less than 5 microns were α-Ti_2O_3, Ti_2O_3, and FeO・TiO_2 when Fe-Ti was added to the flux of low hydrogen type, while TiO_2 (anatase), Ti_2O_3, and FeO・TiO_2 when TiO_2 (rutile) was added to titania and cellulose type in the compositions. The mechanism of formation of various oxide inclusion particles in the weld metal was considered.
社団法人日本鉄鋼協会の論文
1977-09-01