借助光学显微镜、扫描电镜、电子探针显微分析仪和X衍射分析等手段,研究了B含量＞1wt%和C含量＜0.2wt%的Fe-B-C铸造合金的凝固组织及合金元素的分布特征.研究发现,Fe-B-C铸造合金的凝固组织由硼化物、铁素体和珠光体组成,而且硼化物全部是Fe2B,显微硬度达到1430-1480HV,硼化物沿晶界呈网状分布.随着凝固冷却速度增加,凝固组织和硼化物明显细化.研究还发现,快速冷却条件下,硼化物数量减少,铁素体有增加趋势.另外,硼主要分布在硼化物中,基体中分布甚微.
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