Cr_(3)C_(2)添加量对WC-6%Co超细晶硬质合金微结构及力学性能的影响  

Effect of Cr_(3)C_(2)Addition Amount on Microstructure and Mechanical Properties of Ultrafine Grained WC-6%Co Cemented Carbide

作　　者：肖雷[2] 尹超[1,2] 阳立庚 蒋甘澍[2] 饶承毅 Xiao Lei;Yin Chao;Yang Ligeng;Jiang Ganshu;Rao Chengyi(State Key Laboratory of Cemented Carbide,Zhuzhou Hunan 412000,China;Zhuzhou Cemented Carbide Group Co.Ltd.,Zhuzhou Hunan 412000,China)

机构地区：[1]硬质合金国家重点实验室,株洲412000 [2]株洲硬质合金集团有限公司,株洲412000

出　　处：《硬质合金》2024年第1期28-36,共9页Cemented Carbides

基　　金：国家重点研发计划(2022YFB3806702);湖南省十大技术攻关项目(2021GK1170)。

摘　　要：本文采用X射线衍射(XRD)、扫描电镜(SEM)和性能检测等研究了Cr_(3)C_(2)添加量对WC-6%Co-(0~1.0%)Cr_(3)C_(2)超细晶硬质合金WC粒度、WC形貌及力学性能的影响。结果表明:WC平均晶粒尺寸随Cr_(3)C_(2)添加量的增加先快速后缓慢减小;添加0.25%Cr_(3)C_(2)后,诱发WC晶粒各向异向生长,WC晶粒形貌呈准三棱柱状,随Cr_(3)C_(2)添加量的增加,WC晶粒形貌更规则,最终变成三棱柱状;随Cr_(3)C_(2)添加量的增加,WC-6%CoCr_(3)C_(2)超细晶硬质合金的硬度先快速后缓慢增加,而断裂韧性逐渐降低,抗弯强度先增加后缓慢降低;当添加0.6%Cr_(3)C_(2)时,WC-6%Co硬质合金的综合性能最优,其维氏硬度、抗弯强度和断裂韧性分别为18.42 GPa、3450 MPa和9.32 MPa·m^(1/2)。In this paper,the effects of Cr_(3)C_(2)addition amount on the particle size,morphology,and mechanical properties of ultrafine grained WC-6%Co-(0~1.0%)Cr_(3)C_(2)cemented carbide were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),and property detection.The results show that the average grain size of WC decreases rapidly at first and then slowly with the increase in the Cr_(3)C_(2)addition amount.The addition of 0.25%Cr_(3)C_(2)induces the anisotropic growth of WC grains,and the morphology of WC grains is a quasi-triangular prism.With the increase in the Cr_(3)C_(2)addition amount,the morphology of WC grains becomes more regular and finally becomes a triangular prism.With the increase in the addition amount of Cr_(3)C_(2),the hardness of ultrafine grained WC-6%Co-Cr_(3)C_(2)cemented carbide first increases rapidly and then slowly,but the fracture toughness gradually decreases,and the bending strength first increases and then slowly decreases.When 0.6%Cr_(3)C_(2)is added,the comprehensive performance of WC-6%Co cemented carbide is the best,and its Vickers hardness,bending strength,and fracture toughness are 18.42 GPa,3450 Mpa,and 9.32 MPa·m^(1/2),respectively.

关 键 词：Cr_(3)C_(2)添加量 晶粒度分布 WC形貌 力学性能 

分 类 号：TG135.5[一般工业技术—材料科学与工程]