Effects of cubic carbides and La additions on WC grain morphology,hardness and toughness of WC-Co alloys  

立方碳化物和La添加剂对WC-Co合金中WC晶粒形貌以及合金硬度与韧性的影响(英文)

作　　者：张立[1] 陈述[2] 程鑫[1] 吴厚平[1] 马鋆[1] 熊湘君[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]长沙矿冶研究院有限责任公司,长沙410012

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第7期1680-1685,共6页中国有色金属学报（英文版）

基　　金：Project (51074189) supported by the National Natural Science Foundation of China;Project (20100162110001) supported by Research Fund for the Doctoral Program of Higher Education of China;Project (2011BAE09B02) supported by the National Science & Technology Special Foundation of China

摘　　要：Effects of Cr3C2,VC and La2O3 additions on the WC grain morphology,hardness and toughness of WC-10Co alloys were investigated.To intensify the grain growth driving force,nano W and nano C,instead of the conventionally used WC,were used as the starting materials.To obtain a three-dimensional WC grain morphology,the natural sinter skins of the alloys were observed directly by scanning electron microscopy.It is shown that the additions have a strong ability in regulating the WC grain morphological and grain size distribution characteristics and the combinations of hardness and toughness.Due to the formation of regular and homogeneous triangular platelet WC grains,WC-10Co-0.6Cr3C2-0.06La2O3 alloy shows an excellent combination of hardness and toughness.The morphological regulation mechanism,the relationship between the WC grain morphology and the properties were discussed.研究了立方碳化物 Cr3C2、VC 以及稀土 La 添加剂对 WC-Co 合金中 WC 晶粒形貌以及合金硬度与韧性的影响。为了强化烧结过程中 WC 晶粒生长的驱动力,采用具有高烧结活性的纳米 W 和纳米 C 为原料。为了获得合金中 WC 晶粒的三维形貌,采用扫描电镜直接观察合金烧结体的自然表面。结果表明,合金添加剂对WC 晶粒形貌及其粒度分布特征以及合金的硬度与韧性有较大影响。由于均质三角棱柱形板状 WC 晶粒的形成,WC-10Co-0.6Cr3C2-0.06La2O3 合金具有极佳的硬度与韧性组合。讨论了合金中 WC 晶粒形貌的调控机制以及合金中 WC 晶粒形貌特征对合金性能的影响。

关 键 词：cemented carbide rare earth grain growth platelet WC grain hardness TOUGHNESS 

分 类 号：TG131[一般工业技术—材料科学与工程]