梯度超粗晶硬质合金的制备与组织性能研究  

Preparation and Characterization of Graded Ultra Coarse Grain Cemented Carbide

作　　者：张其文[1] 宋晓艳[1] 刘雪梅[1] 王海滨[1] 张忠健[2] 

机构地区：[1]北京工业大学材料科学与工程学院新型功能材料教育部重点实验室,北京100124 [2]硬质合金国家重点实验室,湖南株洲412000

出　　处：《硬质合金》2016年第1期8-13,共6页Cemented Carbides

基　　金：国家自然科学基金(51174009);国家杰出青年科学基金(51425101)

摘　　要：本文报道了一种制备梯度超粗晶硬质合金的新方法：结合初始WC-Co硬质合金棒料的成分设计和区域熔炼处理工艺,制备了显微组织和性能连续梯度分布的硬质合金棒料。对制备的梯度硬质合金棒料分别表征分析显微组织结构、晶粒尺寸、Co含量变化和硬度分布等,结果表明：沿着硬质合金棒料的轴线方向,WC晶粒尺寸范围为14.95~25.09μm,Co的质量分数变化为3.0%~12.5%,硬度变化范围为8 100~9 800 N/mm2。本文提出的新方法实现了梯度结构和超粗晶组织的有效结合,可赋予硬质合金棒料不同部位以不同特征的力学性能。A novel method to fabricate the continuously graded cemented carbide with ultra coarse grain structures was researched. Combining the design of compositions in initial material with the zone melting treatment, the cemented carbide rods with gradient characteristics of the microstructure and properties were obtained. The microstructure, grain size, cobalt content transformation and hardness of the graded cemented carbide rods were tested. The results show that along the axis of the rod specimens, the WC grain size changes in the range of 25.09 to 14.95 μm, the Co content changes in the range of 3.0to 12.5 wt.%, and the hardness is in the range of 8 100 to 9 800 N/mm2. Thus an access is provided to realize the good combination between the gradient structure and the ultra coarse grains, which assists to obtain special mechanical properties within various regians in the cemented carbide rod materials.

关 键 词：超粗晶硬质合金 区域熔炼 梯度结构 晶粒尺寸 硬度分布 

分 类 号：TG135.5[一般工业技术—材料科学与工程]