Co含量对超细YG类硬质合金结构及性能的影响

Effect of Cobalt Content on Microstructure and Properties of Ultrafine YG Cemented Carbide

制备了不同Co含量的超细硬质合金YG6和YG8,通过对试样进行表面形貌观察和物理力学性能测试,研究了Co含量对超细YG类硬质合金力学性能及组织结构的影响。在超细硬质合金的表面采用CVD法制备了TiCN-Al_(2)O_(3)-TiN多层复合涂层,对涂层合金进行微观结构观察、硬度和切削性能测试,探讨不同Co含量合金制备的刀具的切削性能。实验结果表明:随着Co含量的增加,WC晶粒更致密,没有发生晶粒异常长大,硬质合金硬度略有下降,相对磁饱和强度和抗弯强度增加,断裂源较少。Co含量低的硬质合金刀具磨损更严重,切削性能下降,刀具失效快。

Ultrafine cemented carbide YG6 and YG8 with different Co content were prepared.The effect of Co content on the mechanical properties and microstructure of ultrafine YG cemented carbide was studied by surface morphology observation and physical and mechanical property test of the samples.TiCN-Al_(2)O_(3)-TiN multilayer composite coating was prepared on the surface of ultrafine cemented carbide by CVD me-thod.Microstructure observation, hardness measurement and cutting performance test of the coated alloy were carried out to investigate the cutting performance of the tools prepared with the alloys containing different Co content.The experimental results show that with the increase of Co content, WC grains become denser, no abnormal grain growth occurs, the hardness slightly decreases, the relative magnetic saturation strength and bending strength increase, and there are fewer fracture sources.The tool wear of cemented carbide with low Co content is more serious, the cutting performance is declined, and the tool failure is faster.