Cr<sub>3</sub>C<sub>2</sub>添加量对WC-10Co硬质合金组织与性能的影响

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Abstract The WC-10Co cemented carbides with different Cr₃C₂ additive amount (0-4.0%) were prepared by traditional powder metallurgy. The microstructure of the alloy was analyzed by optical microscopy (OM), scanning electron microscopy (SEM) and energy spectrometer. The magnetic force, cobalt magnetic, density, transverse fracture strength, vickers hardness and fracture toughness of the WC-10Co cemented carbides were tested. The effect of Cr₃C₂additive amount on the conventional properties was studied. The effect of Cr₃C₂ addition on the grain size and grain uniformity of WC was emphatically discussed. The results show that addition of Cr₃C₂ can effectively refine the grain of WC-Co cemented carbide. With increasing Cr₃C₂ additive amount, the grain uniformity of WC improves, the cobalt magnetism of the alloy decreases linearly, the alloy density and fracture toughness also decrease, the hardness and the magnetic force increase, and the transverse fracture strength increases first and then decreases. The optimal comprehensive mechanical properties of the alloy with the magnetic force of 19.0 kA/m, density of 14.45 g/cm³, hardness (HV₃₀) of 1 600, bending strength of 3 920 MPa, fracture toughness of 10.5 MPa∙m^1/2 was obtained when the Cr₃C₂ additive amount is 0.5%.

Key words： cemented carbides Cr₃C₂ additive amount microstructure grain properties

Received: 26 February 2018 Published: 12 July 2019

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	TANG Qijia
	LI Zhongdian
	WANG Yanjie
	ZHANG Yong

Cite this article:

TANG Qijia,LI Zhongdian,WANG Yanjie, et al. Effect of the Cr₃C₂ additive amount on the microstructure and properties of WC-10Co cemented carbides[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 460-466.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I5/460

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