鉄-クロム合金における介在物の生成挙動

抄録

It is necessary to analyse the fomation behaviour of tetragonal chromite from the crystallographical and technological viewpoints.
Various physical means such as high temperature X-ray, Massbauer resonance and X-ray emission peak shift studies have been employed in this investigation.
Results obtained were as follows:
1) Mössebauer resonanse study indicate that all the tetragonal chromites have quadrupole splitting. The value becomes larger as the tetragonality of chromite increases. This tendency agrees with the Crka doublet shift study. It is also found that the existence of Cr²⁺, may disturb the cubic symmetry in the chromite crystal field.
2) From the high temperature X-ray diffraction study, it was found that the experiment at lower temperature such as 100-200°C should be performed precisely to pursue whether Jahn-Teller effect contributes to tetragonal chromite.
3) Chromium content in the inclusions extracted from the high-chromium alloys is over the stoichiometric composition of FeCr₂O₃. This fact agrees with the results obtained from the synthesis of the tetragonal chromite.