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Effect of WC grain size on mechanical properties and microstructures of cemented carbide with medium entropy alloy Co-Ni-Fe binder

WC 晶粒尺寸对中熵合金 (Co-Ni-Fe) 粘结剂硬质合金力学性能和微观组织的影响

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Abstract

For developing new binder phase with high performance, Co-Ni-Fe alloy was used as binder in cemented carbides. The mechanical properties of WC-CoNiFe and WC-Co cemented carbides with different grain sizes were studied. The results show that the reprecipitation of WC-CoNiFe is inhibited compared with that of WC-Co during sintering process, and the grains in WC-CoNiFe cemented carbides are more of smooth shape, resulting in a slightly lower hardness and higher transverse rupture strength. With the increase of the grain size, the hardness of the two cemented carbides decreases, and the transverse rupture strength increases. However, the slope values of K in Hall-Petch relationship are higher in WC-CoNiFe than those in WC-Co, indicating the high toughness of medium entropy alloy Co-Ni-Fe.

摘要

为了开发高性能的新型粘结相, Co-Ni-Fe 合金被用作硬质合金中的粘结剂. 本文研究了不同晶 粒尺寸的 WC-CoNiFe 与 WC-Co 的力学性能的差异. 结果表明, 与 WC-Co 相比, 在烧结过程中 的变大, 两种硬质合金的硬度变低, 抗弯强度上升. 而且, 在霍尔-佩奇关系中, WC-CoNiFe 的斜率 值 高于 K 高于 WC-Co, 表明中熵合金 Co-Ni-Fe 具有较高的韧性.

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Authors and Affiliations

  1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China

    Cheng Qian  (钱铖), Kun Li  (李昆), Bin Liu  (刘彬), Zheng-yi Long  (龙郑易) & Yong Liu  (刘咏)

  2. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Xue-yi Guo  (郭学益)

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  1. Cheng Qian  (钱铖)
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Correspondence to Yong Liu  (刘咏).

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Foundation item: Project(51671217) supported by the National Natural Science Foundation of China; Project(2016YFB0700302) supported by the National Key Research and Development Plan of China

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Qian, C., Li, K., Guo, Xy. et al. Effect of WC grain size on mechanical properties and microstructures of cemented carbide with medium entropy alloy Co-Ni-Fe binder. J. Cent. South Univ. 27, 1146–1157 (2020). https://doi.org/10.1007/s11771-020-4355-5

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  • DOI: https://doi.org/10.1007/s11771-020-4355-5

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