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采用Thermo-Calc热力学软件计算不同Cr含量Fe-xCr-yB含硼高速钢的Fe-B伪二元垂直截面图。采用OM、SEM、EDS和XRD等研究观察了Fe-xCr-yB(x=1.0%、3.0%、5.0%、7%;y=0.5%、1.0%、1.5%、2.0%、2.5%、3.0%)合金钢的铸态微观组织和物相组成,并通过硬度测试和冲击韧性试验研究了Cr和B含量对含硼高速钢的相图、凝固组织及力学性能的影响。结果表明:随着Cr含量的增加,共晶反应温度升高,共晶点的B含量降低,但共晶反应产物未发生变化,铸态含硼高速钢的硬度和冲击韧性增加;B含量的增加,促进了M3(B,C)和M23C6硬质相的生成,有利于高速钢硬度的提高,但冲击韧性值有所降低。
Fe-B pseudo-binary vertical section of Fe-xCr-yB boron-containing high speed steel with different Cr content was calculated by Thermo-Calc thermodynamic software. Fe-xCr-yB (x = 1.0%, 3.0%, 5.0%, 7%; y = 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0 %) As-cast microstructure and phase composition of the as-cast alloy steel, and the influence of Cr and B content on the phase diagram, solidification microstructure and mechanical properties of boron-containing high speed steel was studied by hardness test and impact toughness test. The results show that with the increase of Cr content, the eutectic reaction temperature increases and the B content of the eutectic point decreases, but the eutectic reaction product does not change. The hardness and impact toughness of the as-cast boron- Increasing, promoting the formation of M3 (B, C) and M23C6 hard phase, is conducive to the increase of high-speed steel hardness, but the impact toughness value is reduced.