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利用扫描电镜/能谱仪和透射电镜表征了残余元素Sn在C-Mn钢中的存在形式,同时考察了热处理温度对含Sn析出相类型的影响.结果表明:Fe-5%Sn中Sn以第二相形式在晶界与晶内析出;Fe-1.5%Sn-0.2%S中Sn以第二相形式在直径2~4μm的球形MnS夹杂物上异质析出.透射电镜分析和热处理实验结果表明:在Fe-5%Sn及Fe-1.5%Sn-0.2%S中MnS夹杂上析出的含Sn第二相结构为四方晶系的FeSn_2相.
The existence of Sn as residual element in C-Mn steel was characterized by scanning electron microscopy (SEM), energy-dispersive spectroscopy and transmission electron microscopy (TEM), and the effects of heat treatment temperature on the type of Sn-containing precipitate were investigated. The second phase precipitates in the grain boundaries and in the grain, and Sn precipitates heterogeneously on the spherical MnS inclusions 2 ~ 4 μm in diameter in the second phase in Fe-1.5% Sn-0.2% S. The results of transmission electron microscopy and heat treatment It shows that the second phase containing Sn precipitated on MnS in Fe-5% Sn and Fe-1.5% Sn-0.2% S is tetragonal FeSn_2 phase.