Effects of Cr concentration on the microstructure and properties of WC-Ni cemented carbides
Effects of Cr concentration on the microstructure and properties of WC-Ni cemented carbides
复制标题
Cr浓度对WC-Ni硬质合金组织和性能的影响
DOI：
10.1016/j.jmrt.2019.11.030
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发表时间：
2020-01-01
影响因子：
6.4
通讯作者：
Luo, Fenghua
中科院分区：
文献类型：
--
作者：
Li, Guoping;Peng, Yingbiao;Luo, Fenghua
在热力学计算的基础上，通过固定碳势，设计了高Ni含量的WC-Ni-Cr_3C_2模型合金。晶粒生长抑制剂Cr 3C 2在Ni粘结相中的溶解度已经通过电子探针显微分析实验确定，并与热力学计算进行了比较。考虑到所观察到的溶解度极限，制备了五种具有不同Cr 3C 2含量的合金，并与无Cr合金进行了比较。采用光学显微镜、扫描电镜、电化学测试和力学性能测试等方法研究了Cr 3C 2对WC-Ni硬质合金显微组织、耐蚀性和力学性能的影响。我们的结果表明，Cr 3C 2浓度的增加会导致硬质合金样品的密度和断裂韧性降低。添加0.75wt.%的复合材料硬度最大Cr3C2。添加Cr 3C 2可显著提高WC-Ni硬质合金在H2SO 4溶液中的耐蚀性。(C)2019年，任作家。由爱思唯尔公司出版
Based on thermodynamic calculations, WC-Ni-Cr3C2 model alloys with high Ni content have been designed by fixing the carbon potential to form either graphite or eta (M6C) phases. The solubility of the grain growth inhibitor Cr3C2 in the Ni binder phase has been experimentally determined by electron-probe microanalysis and compared with thermodynamic calculations. Five alloys with different Cr3C2 contents were prepared considering the observed solubility limit and compared with a Cr-free alloy. The effects of Cr3C2 addition on the microstructures, corrosion resistance, and mechanical properties of WC-Ni cemented carbides were studied using optical microscopy (OM), scanning electron microscopy, electrochemical examinations, and mechanical property tests. Our results indicate that an increase in the Cr3C2 concentration results in a decrease in both the density and the fracture toughness of cemented carbide samples. The maximum hardness was obtained with the addition of 0.75 wt.% Cr3C2. The corrosion resistance of WC-Ni cemented carbides in H2SO4 solution can be significantly improved with the addition of Cr3C2. (C) 2019 The Authors. Published by Elsevier B.V.