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梯度硬质合金结合了高硬度与高韧性的优异特性,成为近年来该领域的研究热点。对经渗碳处理的添加有(Ti,Ta)C的梯度硬质合金进行了详细分析。采用金相显微镜、X-射线光电子能谱仪和维氏硬度计沿合金梯度方向分别对其内部微观结构、元素含量分布及硬度进行了检测分析。结果表明:梯度硬质合金表层形成大量固溶体相,并呈团簇状分布;梯度方向Co相迁移现象不明显,富Co层接近合金表面;合金沿梯度方向的硬度变化与不含添加剂的WC-Co梯度硬质合金有所不同。
Gradient cemented carbide combines the excellent properties of high hardness and high toughness, and has become a hot spot in this field in recent years. The carburized gradient cemented carbide added with (Ti, Ta) C was analyzed in detail. The internal microstructure, elemental content distribution and hardness of the alloy were detected and analyzed by metallographic microscope, X-ray photoelectron spectroscopy and Vickers hardness tester. The results show that a large amount of solid solution phase is formed on the surface of gradient cemented carbide and distributed in clusters. The migration of Co phase in the gradient direction is not obvious, and the Co-rich layer is close to the alloy surface. The hardness changes along the gradient direction are similar to those of the WC- Co gradient cemented carbide is different.