借助光学显微镜、扫描电镜和X射线衍射分析等手段,研究了硼(B)含量＞2.0%和碳(C)含量＜0.2%的铸造Fe-B-C合金的凝固组织及热处理后的组织和性能.铸造Fe-B-C合金的凝固组织由Fe2B、铁素体和珠光体组成,硼化物呈网状沿晶界分布.Fe-B-C合金经950℃正火处理后,局部出现断网现象,基体组织全部转变为板条马氏体,硬度大幅度提高,HRC接近60,冲击韧度大于10 J/cm2,动态断裂韧度大于30 MPa·m1/2.在干滑动磨损条件下,Fe-B-C合金的耐磨性优于镍硬白口铸铁和GCr15、Cr12MoV等合金钢,与高铬白口铸铁相当.Fe-B-C合金熔炼简便、铸造性能好,且不含Ni和Mo等昂贵合金元素,具有较低的生产成本.
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