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研究了稀土、氮复合变质处理对含0.26wt%C,2.05wt%B和0.64wt%Ti的高硼低碳铁基合金凝固组织和性能的影响。结果表明,高硼低碳铁基合金的凝固组织中除了有网状分布的Fe2B化合物外,还存在少量TiB2块状组织;经稀土、氮复合变质处理后,组织明显细化且分布均匀性增加,硼化物中出现了多处明显颈缩和断网现象,没有新相出现,其硼化物仍是Fe2B和TiB2;此外,变质处理对高硼低碳铁基合金硬度无明显影响,但明显提高抗弯强度和冲击韧度。最后分析了高硼低碳铁基合金凝固组织和性能变化的原因。
The effects of rare earth and nitrogen compound metamorphic treatment on the microstructure and properties of high boron and low carbon iron-based alloys containing 0.26wt% C, 2.05wt% B and 0.64wt% Ti were studied. The results show that in addition to the reticular Fe2B compound, a small amount of TiB2 massive structure exists in the solidified microstructure of the high boron and low carbon iron-based alloy. After rare earth and nitrogen compound metamorphism treatment, the microstructure is obviously refined and the distribution uniformity increases , Many obvious necking and breaking phenomenon appeared in the boride, no new phase appeared, and the borides were still Fe2B and TiB2. In addition, the metamorphic treatment had no obvious effect on the hardness of high boron and low carbon iron-based alloy, but obviously increased Flexural strength and impact toughness. Finally, the reasons for the variation of solidification microstructure and properties of high boron and low carbon iron-based alloys were analyzed.