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用 TEM 研究了 Fe-C-Si,Fe-C-Mn,Fe-C-Si-Mn 合金的贝氏体形态。结果表明,Fe-C-Si 合金贝氏体由α板条和板条间残余γ组成,长时间等温过程中,残余γ逐渐分解析出 Fe_3C。Fe-C-Mn 合金贝氏体,在α形成过程中,伴随着 Fe_3C 析出。450℃等温形成的贝氏体中,观察到板条间和板条内均存在 Fe_3C。晶体学分析表明,Fe_3C 由γ中析出。Fe-C-Si-Mn 合金贝氏体以基元方式生长。在基元间残余γ,未观察到 Fe_3C 析出。等温时间延长,残余γ逐渐分解析出碳化物。
The bainite morphology of Fe-C-Si, Fe-C-Mn and Fe-C-Si-Mn alloys was investigated by TEM. The results show that the bainite of Fe-C-Si alloy consists of residual γ between α-lath and lath, and the residual γ gradually decomposes to Fe_3C during the long-time isothermal process. Fe-C-Mn alloy bainite, with the formation of α, with Fe 3 C precipitation. 450 ℃ isothermal formation of bainite, the presence of Fe_3C between the laths and slats are observed. Crystallographic analysis shows that Fe 3 C precipitates from γ. Fe-C-Si-Mn alloy bainite growth in the elementary way. There was no residual γ in the intermetallics and no precipitation of Fe 3 C was observed. The isothermal time is prolonged, and the residual γ is gradually decomposed to precipitate carbides.