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【多选题】
关于上贝氏体的转变过程，以下说法正确的是A.
首先在奥氏体晶界或附近贫碳区形成铁素体晶核
B.
条状铁素体前沿奥氏体中碳原子不断向远处扩散，铁素体中多余碳向两侧相界面扩散
C.
碳在铁素体两侧的奥氏体中富集，达到一定程度时形成渗碳体
D.
在铁素体条内，也可能形成少量细小的渗碳体
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