Effects of NbC additions on the microstructure and properties of non-uniform structure WC-Co cemented carbides

微观结构 材料科学 电子探针 扫描电子显微镜 碳化物 断裂韧性 衍射仪 粒度 相(物质) 冶金 硬质合金 溶解 复合材料 化学 有机化学 物理化学
作者
Yang Gao,Mingyuan Yan,Binghui Luo,Sheng Ouyang,Wei Chen,Zongqing Bai,Hui-bo Jing,Wen‐Wen Zhang
出处
期刊:Materials Science and Engineering A-structural Materials Properties Microstructure and Processing [Elsevier BV]
卷期号:687: 259-268 被引量:61
标识
DOI:10.1016/j.msea.2017.01.077
摘要

In this work, the effects of NbC additions on microstructure and properties of non-uniform structure WC-7Co cemented carbides were investigated X-ray diffractometer, scanning electron microscopy (SEM), electron probe microanalysis (EPMA), mechanical properties tester and electrochemical workstation, respectively. The results show that WC phase can be partially dissolved into the NbC to form a (Nb,W)C solid solution. According to EPMA analysis, the amount of W atoms, dissolving into the NbC grains, increases with the NbC addition. Moreover, when the content of NbC is beyond 1%, the WC-Co cemented carbides with non-uniform structure are formed with significant reduction of average grain size of WC. With NbC addition increasing from 0 wt% to 2 wt%, the hardness is increased from 1475 MPa to 1570 MPa while the fracture toughness decreased from 12.1 MPa m1/2 to 10.3 MPa m1/2. However, with the further addition of NbC, the hardness slightly decreased. With NbC addition between 0 and 1 wt%, the TRS is gradually decreased from 2982 MPa to 2745 MPa, while, as the NbC content exceeds 1 wt%, the TRS leveled off. Because of the decrease of grain size and the (Nb,W)C phase formation, caused by NbC addition, the crack defection was weakened, which led to the decrease of fracture toughness. Meanwhile, the corrosion resistance of non-uniform structure WC-Co cemented carbides can be significantly improved by adding NbC to the material due to increased α-Co in binder phase.
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