Research on properties of Re-doped WC-Co alloys

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-08-11 DOI:10.1016/j.ijrmhm.2025.107373

Mingxing Li , Caixu Yue , Xianli Liu , Jinming Zhou

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Abstract

The properties of cemented carbide with Re contents were studied. Based on the first principles, a Re-doped WC-Co model was established. Due to Re doping, the mechanical properties of the cemented carbide were significantly improved. The cemented carbides with different Re contents were prepared and tested. It was found that the average grain size of WC decreased from 0.64 μm to 0.54 μm with the increase of the Re element, and the grain size became more uniform. The addition of Re element promotes the transformation from the face-centered cubic Co phase (fccCo) to the hexagonal close-packed Co phase (hcpCo). At the same time, the addition of Re element weakens the concentration of {0001} in WC hard phase texture and promotes the isotropy of WC grains. After adding Re, the number of high angle grain boundaries, WC/WC 90° grain boundaries and coincidence site lattice ∑² increases significantly. With the increase of Re content, the hardness and bending strength show an upward trend, and the fracture toughness did not decrease significantly. In addition, friction and wear tests on cemented carbide were performed. The cemented carbide with Re content of 0.1 wt% exhibited excellent wear-resistance. Milling experiments on Ti6Al4V were also conducted using cemented carbides with different compositions. Compared with T0812, the cutting life of T0890 can be increased by 78 %. Lay the foundation for the development of high performance tools.

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重掺杂WC-Co合金的性能研究

研究了含稀土硬质合金的性能。基于第一原理，建立了重掺杂WC-Co模型。由于稀土的掺入，硬质合金的力学性能得到了显著改善。制备了不同稀土含量的硬质合金，并对其进行了测试。结果表明，随着稀土含量的增加，WC的平均晶粒尺寸由0.64 μm减小到0.54 μm，晶粒尺寸趋于均匀；稀土元素的加入促进了面心立方Co相（fccCo）向六方致密Co相（hcpCo）的转变。同时，Re元素的加入削弱了WC硬相织构中{0001}的浓度，促进了WC晶粒的各向同性。添加Re后，高角度晶界、WC/WC 90°晶界和符合点阵∑2的数量显著增加。随着稀土含量的增加，硬度和抗弯强度呈上升趋势，断裂韧性没有明显下降。此外，对硬质合金进行了摩擦磨损试验。稀土含量为0.1 wt%的硬质合金具有优异的耐磨性。采用不同成分的硬质合金对Ti6Al4V进行了铣削试验。与T0812相比，T0890的切削寿命可提高78%。为开发高性能工具奠定基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.