WC对碳化钛基高锰钢钢结硬质合金组织与性能的影响  

Effect of WC Additive on the Microstructure and Properties of TiC-based High Manganese Steel-bonded Carbide

作　　者：王立功[1] 郑希江[1] 路艳玲 李国平[1,2] 颜练武 Wang Ligong;Zheng Xijiang;Lu Yanling;Li Guoping;Yan Lianwu(Department of Mechanical and Automotive Engineering,Laiwu Vocational and Technical College,Jinan Shandong 271100,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha Hunan 410083,China;College of Metallurgical and Materials Engineering,Hunan University of Technology,Zhuzhou Hunan 412000,China)

机构地区：[1]莱芜职业技术学院机械与汽车工程系,山东济南271100 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083 [3]湖南工业大学冶金与材料工程学院,湖南株洲412000

出　　处：《硬质合金》2020年第3期225-232,共8页Cemented Carbides

基　　金：2016年山东省重点研发计划项目《多孔碳化钛陶瓷材料研究与开发》(2016GGX102044);2018年济南市莱芜高新区科技创新与发展计划项目《预合金粉为粘结剂的高强韧TiC钢结硬质合金研究与应用》(2018GX101014)。

摘　　要：以Fe-Mo、Fe-Mo-Cr预合金粉为粘结剂,加入WC以及Ni、Mn、C等合金元素,采用粉末冶金工艺制备了TiC基高锰钢钢结硬质合金,研究了WC对TiC基高锰钢钢结硬质合金组织与性能的影响。采用扫描电子显微镜对实验合金的组织进行了观察和分析,并对合金的物理力学性能进行了检验。结果表明,未加WC的合金中出现了黑芯-灰环和灰色粘结剂两种结构;添加WC的合金中观察到了黑芯-灰环、灰色粘结剂和其他多种复杂的结构。并且,随着WC含量的增加,合金组织的硬质相晶粒尺寸明显细化。结果还表明,随着WC含量的增加,合金的相对致密度、硬度一直增大,但抗弯强度和冲击韧性先增大后减小。当WC质量分数为15%时,合金的冲击韧性达到最大值12.2 J/cm2,相对致密度、硬度和抗弯强度分别达到98.5%、88.2 HRA、1852 MPa。因此,这种合金(WC质量分数15%)可以用于代替硬质合金制造挖掘机装载机斗齿的镶嵌件以及采煤机截齿等在冲击条件下使用的耐磨零件。TiC-based high manganese steel-bonded carbide was manufactured with powder metallurgy techniques using Fe-Mo, Fe-Mo-Cr pre-alloyed powders as the binders and other components WC, Ni, Mn, graphitic carbon et al as additives,and the effect of WC addition on the microstructure and properties of the experimental alloys was studied. The microstructures of the experimental alloys were observed and analyzed by scanning electron microscope(SEM), physical and mechanical properties of the alloys were also tested. The results show that there are two kinds of structures, namely black core-gray rim and gray metallic binder, were observed in the microstructure of the alloy without WC additive;then black core-gray rim, gray metallic binder and several complex structures were observed in the microstructure of the alloys with WC addition. While, the ceramic phase grain size of the alloys was refined obviously with the increase of WC content. The results also show that the relative density and hardness of the alloy increased monotonously with the increase of WC content, while, the transverse rupture strength(TRS) and impact toughness(IM) first increased and then decreased. When the WC content is 15%(the contents of the paper without special discription are all mass fractions) The impact toughness(IM) of the alloy is maximum reaches the value of 12.2 J/cm2, and the relative density, hardness and TRS reach 98.5%, 88.2 HRA and 1 852 MPa respectively. Therefore, this alloy(WC additive of 15%) can be used to replace cemented carbide in the manufacture of excavator loader bucket teeth inlay and shearer cutting teeth and other wear-resistant parts under the severe impact working conditions.

关 键 词：碳化钛 钢结硬质合金 WC 组织 性能 

分 类 号：TF125.3[冶金工程—粉末冶金]