【摘要】 Fe-Cr-B合金具有优异的耐铝液腐蚀性能,但韧性较差。为了改善Fe-Cr-B合金的韧性,文中研究了添加Ce(质量分数为0～0.92%)对Fe-Cr-B合金微观结构、力学性能及耐750℃熔融铝液腐蚀性能的影响。结果表明:Ce的添加使Fe-Cr-B合金中的硼化物组织由连续的网状、树枝状、长条状结构转变为互连较少的短棒状、块状结构;随着Ce含量的增加,合金的冲击韧性逐渐提高,耐铝液腐蚀性能先提高后下降;分布均匀的短棒状硼化物组织可使Fe-Cr-B合金在提高冲击韧性的同时保持优异的耐铝液腐蚀性能;添加0.59%Ce的Fe-Cr-B合金可获得最佳的综合性能,其冲击韧性比不含Ce的合金提高了187.97%,耐铝液腐蚀性能达到典型模具材料H13钢的5.9倍。更多还原

【Abstract】 Fe-Cr-B alloy has excellent corrosion resistance to molten aluminum, but its toughness is poor.In order to improve the toughness of Fe-Cr-B alloy, the influence of Ce addition(0～0.92%,mass fraction) on the microstructure, mechanical properties and corrosion resistance of Fe-Cr-B alloy in molten aluminum at 750 ℃ was investigated.The results show that the addition of Ce changes the boride structure in Fe-Cr-B alloy from a continuous network, dendritic and long rod-like structure to a short rod-like and block structure with less interconnection.With the Ce content increases, the alloy’s impact toughness gradually increases, and the corrosion resistance to molten aluminum increases first and then decreases.The uniformly distributed short rod-like boride can improve the alloy’s impact toughness while maintaining excellent corrosion resistance to molten aluminum.The Fe-Cr-B alloy with 0.59% Ce has the best comprehensive properties, its impact toughness is 187.97% higher than that of Ce-free, and its corrosion resistance to molten aluminum reaches 5.9 times that of typical die steel H13.更多还原