切削镍基高温合金Ni、Fe、Cr原子在WC-Co硬质合金刀具中的扩散机制及对刀具性能的影响  

Study on Diffusion Wear Mechanism of Ni,Fe and Cr Atoms in Cutting Nickel-based Superalloys in WC-Co Cemented Carbide Cutting Tools and Its Influence on Tools Properties

作　　者：范依航[1] 李政译 郝兆朋[1] FAN Yihang;LI Zhengyi;HAO Zhaopeng(School of Mechanical and Electrical Engingeering,Changchun University of Technology,Changchun 130012,China)

机构地区：[1]长春工业大学机电工程学院,长春130012

出　　处：《材料导报》2024年第23期234-242,共9页Materials Reports

基　　金：国家自然科学基金(52275404)。

摘　　要：在切削镍基高温合金过程中,采用第一性原理计算研究了Ni、Fe、Cr原子扩散进入WC-Co硬质合金刀具后对刀具所产生的影响,分析了刀具结合能、晶格畸变、电子性质、扩散过渡态、扩散系数、力学性质的变化。研究结果表明,原子在不同间隙位置的结合能都为负值,八面体间隙所引发的晶格畸变更低。Ni、Fe、Cr原子增强了硬质合金WC-Co的金属性,但不利于原子之间的成键,使其机械稳定性降低;三种原子扩散势垒分别为0.82、0.79、1.17 eV,扩散系数的大小关系为D Fe>D Ni>D Cr。实验结果与理论计算相吻合,且实验现象表明元素扩散导致刀具切削性能下降,易诱发刀具的磨粒磨损。In the process of cutting nickel-based superalloy,the influence of Ni,Fe and Cr atoms diffusing into WC-Co cemented carbide cutting tools was studied by first principles calculation.The binding energy,lattice distortion,electronic properties,diffusion transition state,diffusion coefficient and mechanical properties were analyzed.The results show that the binding energy of atoms at different interstitial positions is negative,and the lattice distortion caused by octahedral interstitial spaces is lower.Ni,Fe,Cr atoms can enhance the gold properties of tungsten carbide WC-Co,but do not conducive to bonding between atoms,so the mechanical stability of the cutting decreases;the diffusion barriers of the three kinds of atoms are 0.82,0.79 and 1.17 eV respectively,and the relationship of diffusion coefficients is D Fe>D Ni>D Cr.The experimental result shows that element diffusion leads to the deterioration of cutting performance and the abrasive wear of the tool.

关 键 词：第一性原理 WC-Co硬质合金刀具 扩散 磨损机理 

分 类 号：TM201[一般工业技术—材料科学与工程]