摘要
本文以WC-11%(Ti,W)(Ta,Nb)C-11%Co(质量分数,下同)含多元复式碳化物的WC基合金为研究对象,通过光学显微镜、洛氏硬度计、矫顽磁力计、钴磁测量仪以及扫描电镜观察,研究了不同C含量和球磨时间下WC-11%(Ti,W)(Ta,Nb)C-11%Co硬质合金的组织结构与性能的变化规律。结果表明:矫顽磁力、硬度、密度均随C含量的增加而减小,钴磁随C含量的增加而增大,合金抗弯强度随C含量的升高先增加后下降。随着球磨时间的增加,矫顽磁力、硬度增加,钴磁下降,抗弯强度先增加后下降。在球磨时间为20 h、C含量为6.02%、相对磁饱和为88%左右时抗弯强度最大,可达3100MPa。随着C含量增加,WC晶粒形貌棱角更加分明,溶解-析出过程使WC晶粒变粗,抗弯强度升高,硬度降低。
With the WC-11%(Ti,W)(Ta,Nb)C-11%Co(mass fraction,the same below)WC-based alloy containingmulti-component composite carbides as the research object,optical microscope,Rockwell hardness tester,coercive forcemeter,cobalt magnetometer,and scanning electron microscope were used to observe the variation of the organizationalstructure and performance of the WC-11%(Ti,W)(Ta,Nb)C-11%Co cemented carbide with C content and ball milling time.The results show that coercive force,hardness,and density all decrease with an increasing C content,the cobalt magnetismincreases with C content,and the flexural strength of the alloy increases first and then decreases with an increasing Ccontent.As ball milling continues,coercive force and hardness increase,cobalt magnetism decreases,and flexural strengthincreases first and then decreases.When the ball milling time is 20 h,the C content is 6.02%,and the relative magneticsaturation is about 88%,the flexural strength is the largest and can reach 3100 MPa.With the increase in C content,theWC grains become more angular in terms of morphology,and the dissolution-precipitation process coarsens WC grains,resulting in increased flexural strength and decreased hardness.
作者
邝宏有
戴炳蔚
吴育藩
Kuang Hongyou;Dai Bingwei;Wu Yupan(Zhuzhou Cemented Carbide Group Co.Ltd.,Zhuzhou Hunan 412000,China)
出处
《硬质合金》
CAS
2022年第2期111-117,共7页
Cemented Carbides
关键词
复式碳化物
碳含量
球磨时间
性能
组织结构
composite carbide
carbon content
ball milling time
performance
organizational structure
