RARE EARTH DISSOLVED IN SOLID SOLUTION OF STEEL AND ITS EFFECT ON MICROSTRUCTURE

Lin Qin Ye Wen Li Shuanlu Yu Zongsen(Department of Physical Chemistry,University of Science and Technology,Beijing 100083,P.R.China)

摘 要：<正> The amounts of rare earth in the solid solution in steel 16Mn were determined by means of inductivecoupling plasma（ICP）spectroscopy.While the RE/S ratio was less than 1.9,the amounts of rare earth insolid solution were not more than 8 ppm,which rised slightly with the increase of the rare earth content in thesteel.While the RE/S was more than 1.9,MnS disappeared completely in the steel and the amounts of rareearth in solid solution increased rapidly with the increasing of the rare earth content.The solubility of ceriumin steel 16 Mn（St 52）is less than 0.011 wt% at room temperature.The results also indicate that rare earth insolid solution can reduce the amount of pearlite and increase that of ferrite and its mierohardness.The rela-tionship between microhardness（Hv）and the amount of rare earth in solid solution can be expressed by theequation of Hv=117+7 RE（ppm）.

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