WC-10%Co非均匀结构细晶合金的研究  

Research on Nonuniform and Fine Grain WC-10%Co Cemented Carbide

作　　者：朱国丽[1] 何清勇 唐琛[1] 王权[1] 张平[1] 乔娇[2] 

机构地区：[1]成都工具研究所有限公司,四川成都610500 [2]北京航空航天大学人文社会科学学院,北京100191

出　　处：《硬质合金》2015年第2期88-94,共7页Cemented Carbides

基　　金：国家科技重大专项"汽轮机和燃气轮机叶片及转子轮槽加工系列化刀具应用示范"(2013ZX04009022)

摘　　要：本文采用抗弯强度检测仪、洛氏硬度计、SEM、体视显微镜等检测手段,研究了以超细晶WC-1.0%Co为基础,WC-1.0μm的添加量对WC-10%Co非均匀结构细晶合金组织和性能的影响。研究表明:WC-1.0μm添加量从27%、36%到45%(质量分数),都能形成晶粒度非均匀结构合金组织;非均匀结构合金的平均晶粒度、双晶平均尺寸随WC-1.0μm添加量的增加而增大,但细晶所占比例减少,而粗晶所占比例增加;随WC-1.0μm添加量的增加,合金矫顽磁力、抗弯强度、硬度降低,而断裂韧性有所提高;从切削试验和现场使用情况可知,WC-1.0μm的添加量为36%(质量分数)的合金切削性能最好。The effects of adding amount of WC-1.0μm on the microstructure and properties of nonuniform and fine grain WC-10%Co cemented carbide were studies by hydraulic universal testing machine, Rockwell hardness tester, SEM, optical microscope, etc. The research result shows that, when the adding mount of WC-1.0 μm is 27%, 36% and 45% （mass fraction）, respectively, nonuniform grain microstructure in the alloy can be formed; with the increase of WC content, the average size of WC grain and the average size of double crystal increase, but the proportion of fine grain decreases and the proportion of coarse grain increases; with the increase of WC conten4 the coercive force, bending strength and hardness of the alloy entirely decrease, while the fracture toughness increases. The cutting test and field service situation show that the cutting performance of the alloy is the best when the adding amount of WC-1.0 μm is 36%.

关 键 词：细晶硬质合金 非均匀结构 断裂韧性 切削性能 

分 类 号：TG135.5[一般工业技术—材料科学与工程]