WC-Co合金中晶粒形貌的演变机制及其对合金性能的影响  

Evolution Mechanism of Grain Morphology in WC-Co Carbide and Its Effect on Properties

作　　者：廖江雄 徐纯芳 聂婭 Liao Jiangxion;Xu Chunfan;Nie Ya(Shang Research Institute of Materials, Shanghai 200437, China;ShangHai KeLi Special Carbide Tools ＆ Moulds Co., Ltd, Shanghai 200437, China;Suzhou ShareateTools Co., Ltd, Suzhou Jiangsu 215121, China)

机构地区：[1]上海材料研究所,上海200437 [2]上海科利特种硬质合金工模具开发公司,上海200437 [3]苏州新锐合金工具股份有限公司,江苏苏州215121

出　　处：《硬质合金》2018年第1期63-68,共6页Cemented Carbides

摘　　要：本文研究WC-Co合金中晶粒形貌的演变机制,以及C含量、晶粒抑制剂VC对WC晶粒形貌的影响,探讨了WC晶粒形貌对硬质合金硬度和断裂韧性的影响。结果表明:高C合金中更容易出现三棱柱形晶粒形貌,而低C合金中更容易出现截断三棱柱形晶粒形貌;添加VC的合金WC晶粒会产生尖锐的三角棱柱晶粒,未添加VC的合金WC晶粒形貌为截断三棱柱形;板状晶粒合金的宏观硬度更高,且更容易发生穿过WC晶粒的断裂,三棱柱晶粒以WC晶粒边界断裂为主,其次是沿WC/Co边界断裂。In this paper, the mechanism of grain morphology evolution in WC-Co alloys, and the effect of C content and crystal inhibitor VC on the morphology of WC grains are studied. The effect of WC grain morphology on hardness and fracture toughness of cemented carbides is discussed. The results show that triangular prism-shaped grain morphology is more likely to appear in high-carbon alloys, and the triangular prism-shaped grain morphology is more likely to appear in low-carbon alloys; the alloy added VC will produce sharp triangular prism WC grains. The morphology of WC grain without VC is that of the triple prism; the macro hardness of the plate-shaped grain alloy is higher, and the fracture through the WC grains occurs more easily. The alloy with triangular prism WC grain fracture along WC/WC grain boundaries and also followed by a fracture along the WC/Co border.

关 键 词：演变机制 WC晶粒形貌 三棱柱 带小面的三棱柱 

分 类 号：TG135.5[一般工业技术—材料科学与工程]