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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摘要采用传统粉末冶金法制备Cr₃C₂添加量(质量分数)为0~4%的WC-10Co硬质合金,通过光学显微镜、扫描电镜与能谱仪对合金微观组织进行观察与分析,测试硬质合金的矫顽磁力、钴磁、密度、横向断裂强度、维氏硬度和断裂韧性,研究Cr₃C₂添加量对WC-10Co硬质合金常规性能的影响,并着重探讨Cr₃C₂对WC晶粒尺寸与均匀性的影响。结果表明：添加Cr₃C₂能有效细化WC-Co硬质合金晶粒,随Cr₃C₂添加量增加,WC晶粒均匀性增加。随Cr₃C₂添加量增加,合金的钴磁呈线性下降,合金密度和断裂韧性降低,维氏硬度和矫顽磁力升高,合金横向断裂强度先升高后降低。Cr₃C₂添加量为0.5%合金钴磁为9.0%,矫顽磁力为19.0 kA/m,密度为14.45 g/cm³,维氏硬度HV₃₀为1 600,抗弯强度和断裂韧性分别为3 920 MPa和10.5 MPa∙m^1/2,该合金具有良好的综合力学性能。

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	唐启佳
	李重典
	王雁洁
	张勇

关键词 ：硬质合金, Cr₃C₂添加量, 微观组织, 晶粒, 性能

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

收稿日期: 2018-02-26 出版日期: 2019-07-12

ZTFLH:

TG13

通讯作者: 唐启佳,工程师。电话：13881436396;E-mail: tangqijia505@sina.com

引用本文:

唐启佳, 李重典, 王雁洁, 张勇. Cr₃C₂添加量对WC-10Co硬质合金组织与性能的影响[J]. 粉末冶金材料科学与工程, 2018, 23(5): 460-466.
TANG Qijia, LI Zhongdian, WANG Yanjie, ZHANG Yong. Effect of the Cr₃C₂ additive amount on the microstructure and properties of WC-10Co cemented carbides. Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 460-466.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2018/V23/I5/460

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