钼含量对添加预合金粉制备TiC-高锰钢钢结硬质合金组织与性能的影响  

Effect of Mo Content on Microstructure and Properties of TiC-High Mn Steel Bonded Carbide Prepared with Pre-alloyed Powders

作　　者：李国平[1,2] 陈文[2] 罗丰华[1] 杜勇[1] 刘增林 袁勇 LI Guoping;CHEN Wen;LUO Fenghua;DU Yong;LIU Zenglin;YUAN Yong(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Laiwu Vocational and Technical College,Laiwu 271100,China;Laiwu Iron and Steel Group Powder Metallurgy Co.,Ltd.,Laiwu 271104,China)

机构地区：[1]中南大学,粉末冶金国家重点实验室,长沙410083 [2]莱芜职业技术学院,莱芜271100 [3]莱芜钢铁集团粉末冶金有限公司,莱芜271104

出　　处：《机械工程材料》2018年第8期37-41,47,共6页Materials For Mechanical Engineering

基　　金：2014年山东省科技发展计划项目(2014GGX102015)

摘　　要：以Fe-Mo-C预合金粉、FeMn84C0.4合金粉、镍粉、石墨粉和TiC粉为原料,经烧结得到以高锰钢为黏结相、TiC为硬质相的不同钼含量TiC-高锰钢钢结硬质合金,研究了钼含量对该钢结硬质合金组织与性能的影响。结果表明:随着钼含量的增加,钢结硬质合金组织中TiC颗粒的尺寸先减小后增大,其表面形成了(Ti,Mo)C固溶体相;与添加纯钼粉的相比,添加含钼预合金粉所得钢结硬质合金中的TiC颗粒更细小,圆整度更好,且表面更易形成(Ti,Mo)C固溶体相;随着钼含量的增加,钢结硬质合金的相对密度、硬度、抗弯强度和冲击韧度均先增大后减小,当钼质量分数为1.15%时均达到最大,组织和综合性能较佳。With Fe-Mo-C pre-alloyed powder,FeMn84 C0.4 alloy powder,Ni powder,graphite powder and TiC powder as raw materials,TiC-high Mn steel bonded carbide containing different Mo content,with high Mn steel as adhesive phase and TiC as hard phase,was prepared by sintering.Effects of Mo content on the microstructure and properties of the steel-bonded carbide were studied.The results show that with increasing Mo content,the size of TiC particles in microstructure of the steel-bonded carbide decreased first and then increased,and on surfaces formed（Ti,Mo）C solid solution phase.When being compared with those by adding pure Mo powder,TiC particles in the steel-bonded carbide obtained by adding Mo-containing pre-alloyed powder were relatively fine and relatively round and regular,and（Ti,Mo）C solid solution phase formed relatively easily.With the increase of Mo content,the relative density,hardness,rupture strength and impact toughness of the steel-bonded carbide increased first and then decreased,and reached largest values with Mo content of 1.15 wt%;the microstructure and comprehensive properties were relatively good.

关 键 词：TIC 钢结硬质合金 预合金粉 组织 性能 

分 类 号：TF125[冶金工程—粉末冶金]