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采用喷射成形工艺制备了含铌和不含铌M3∶2型高速钢,然后进行锻造加工.利用扫描电子显微镜、X射线能谱仪、X射线衍射仪等研究了铌对喷射成形M3∶2型高速钢组织和性能的影响.铌的加入细化了沉积态的组织,减小了M2C共晶碳化物尺寸,而对M2C的成分影响不明显.沉积态中MC碳化物的数量随铌含量提高而增多,且其成分变化显著.铌的加入可以提高喷射成形M3∶2型高速钢的抗回火软化性和二次硬化能力.但是,当铌质量分数为1%时,组织中形成数量较多且难以破碎的以铌为主的块状MC碳化物,导致钢的弯曲强度和冲击韧性下降.铌质量分数为0.5%的喷射成形M3∶2型高速钢可以获得最佳的硬度、弯曲强度和冲击韧性.
The niobium-containing and non-niobium-containing M3: 2 high-speed steels were prepared by spray forming and then forging processing.Using the scanning electron microscope, X-ray energy dispersive spectroscopy and X-ray diffraction, High-speed steel microstructure and properties of niobium added to refine the structure of the deposited state, reducing the M2C eutectic carbide size, while the composition of M2C insignificant effect on the amount of MC carbide deposition state with niobium content increased But the composition changes significantly.The addition of niobium can improve the anti-temper softening and secondary hardening ability of spray-formed M3: 2 high-speed steel.But when the mass fraction of niobium is 1% More and more difficult to break the niobium-based massive MC carbide, resulting in the decrease of the bending strength and impact toughness of the niobium mass fraction of 0.5% spray forming M3: 2 HSS can get the best hardness, bending strength And impact toughness.