采用电子背散射衍射(EBSD)研究了低碳Fe-C-Mn-Si钢中晶界铁素体/原奥氏体界面对贝氏体形核的影响.通过两阶段等温热处理,获得了晶界铁素体和贝氏体的混合组织.结合金相观察和取向测量,发现晶界铁素体与贝氏铁素体之间的界面分为两种,一种界面不清晰,一种界面清晰.分析表明,在晶界铁素体/贝氏体界面不清晰一侧,晶界铁素体与原奥氏体保持取向关系,贝氏体在这类界面形核生长,且取向与晶界铁素体保持一致;在晶界铁素体/贝氏体界面清晰一侧,晶界铁素体与原奥氏体无取向关系,且贝氏体与晶界铁素体之间取向差较大.
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