研磨方式对YT5牌号硬质合金性能的影响
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摘要
本文以YT5牌号为研究对象,通过对烧结后合金物理性能的检测及显微结构观察,研究了研磨方式对YT5牌号硬质合金的微观结构及其性能的影响。结果表明:在总球磨时间及其它工艺参数一致的情况下,只预磨(Ti,W)C固溶体有助于提高合金中(Ti,W)C相的分散性;当只预磨(Ti,W)C固溶体时,合金的(Ti,W)C相平均晶粒尺寸会随着预磨时间的增加而增大,合金的矫顽磁力、硬度会降低;当预磨WC及(Ti,W)C固溶体时,合金的(Ti,W)C相平均晶粒尺寸会随着预磨时间的增加而降低,合金的矫顽磁力、硬度会升高;预磨WC及(Ti,W)C固溶体会在一定程度上提高合金的矫顽磁力;研磨方式的改变对合金的强度、钴磁、孔隙度无明显影响。
In this paper, the effect of grinding mode on the microstructure and properties of YT5 cemented carbides is studied by means of testing the physical properties and observing the microstructure of sintered YT5 cemented carbides. The results show that under the condition of consistent total ball grinding time and other process parameters, only pre-grinding(Ti,W)C solid solution is helpful to improve the dispersion of(Ti,W)C phase in the alloy. When only preliminary grinding(Ti,W)C solid solution, the average grain size(Ti,W)C phase in the alloy will increase with the increasing grinding time,while the magnetic force, hardness of the alloy will decrease; When WC and(Ti,W)C solid solution are pre-ground simultaneously, the average grain size of(Ti,W)C phase in the alloy will decrease with the increasing grinding time, while the magnetic force and hardness of the alloy will increase. Pre-grinding WC and(Ti,W)C solid solution can improve the magnetic force of the alloy to a certain extent. The change of grinding mode has no obvious effect on the strength, cobalt magnetism and porosity of the alloy.
In this paper, the effect of grinding mode on the microstructure and properties of YT5 cemented carbides is studied by means of testing the physical properties and observing the microstructure of sintered YT5 cemented carbides. The results show that under the condition of consistent total ball grinding time and other process parameters, only pre-grinding(Ti,W)C solid solution is helpful to improve the dispersion of(Ti,W)C phase in the alloy. When only preliminary grinding(Ti,W)C solid solution, the average grain size(Ti,W)C phase in the alloy will increase with the increasing grinding time,while the magnetic force, hardness of the alloy will decrease; When WC and(Ti,W)C solid solution are pre-ground simultaneously, the average grain size of(Ti,W)C phase in the alloy will decrease with the increasing grinding time, while the magnetic force and hardness of the alloy will increase. Pre-grinding WC and(Ti,W)C solid solution can improve the magnetic force of the alloy to a certain extent. The change of grinding mode has no obvious effect on the strength, cobalt magnetism and porosity of the alloy.
引文
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[5]林晨光,袁冠森.纳米晶WC-Co硬质合金中WC晶粒度的定量测量[J].中国有色金属学报,2005,15(6):823-828.Lin Chenguang,Yuan Guansen.Quantitative measurement of WC grain size in nanocrystalline WC-Co hardmetal[J].The Chinese Journal of Nonferrous Metals,2005,15(6):823-828.
[6]朱骥飞,张立,徐涛,等.基于体视学原理的硬质合金显微组织参数化定量分析[C].第十一次中国硬质合金学术会议论文集.株洲:中国钨业协会硬质合金分会,2014.Zhu Jifei,Zhang Li,Xu Tao,et al.Quantificational characterization of microstructural parameters of cemented carbides based on ImageJ software[C].Proceedings of the 11th Chinese Cemented Carbide Academic Conference.Zhuzhou:Cemented Carbide Branch of China Tungsten Industry Association,2014.
[7]周书助.硬质合金生产原理和质量控制[M].北京:冶金工业出版社,2014.Zhou Shuzhu.Production principle and quality control of cemented carbide[M].Beijing:Metallurgical Industry Press,2014.
[8]李勇,龙坚战.WC-Co硬质合金磁性能与晶粒度之间的关系[J].硬质合金,2010,27(4):195-198.Li Yong,Long Jianzhan.Relationship between magnetic properties and grain size of WC-Co cemented carbides[J].Cemented Carbides,2010,27(4):195-198.
[9]Sherif El-Eskandarany M,Amir Mahday A.Synthesis and characterizations of ball-milled nanocrystalline WC and nanocomposite WC-Co powders and subsequent consolidations[J].Journal of Alloys and Compounds,2000,312(1-2):315-325.
[10]铃木寿.WC-Co合金中孔隙形成机理[J].粉体与粉末治金,1975,6:22.Suzuki H.Mechanism of the pore formation in the WC-Co cemented carbide[J].Powder and Powder Metallurgy,1975,6:22.
[11]易勇,熊继,李懿,等.硬质合金抗弯强度及其分散性的研究[J].工具技术,2002,36(10):16-19.Yi Yong,Xiong Ji,Li Yi,et al.Study on bending strength and its dispersivity of cemented carbide[J].Tool Technology,2002,36(10):16-19.