Microstructure and mechanical properties improvements in cemented carbides by(Cr,Mo,Ta)_(2)(C,N) inhibitors

作     者：Jie Tang Ying Liu Jin-Wen Ye Zhi-Nan Cao Shi-Qing Ma Xiao-Jiao Yang Jie Tang;Ying Liu;Jin-Wen Ye;Zhi-Nan Cao;Shi-Qing Ma;Xiao-Jiao Yang

作者机构：School of Materials Science and EngineeringSichuan UniversityChengdu 610065China Key Laboratory of Advanced Special Material and TechnologyMinistry of EducationChengdu 610065China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2021年第40卷第3期

页      面：679-686页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financially supported by the National Key Research and Development Plan of China(No.2017YFB0305900) the Sichuan Provincial Science Research Program of China(No.2017GZ0120) the Zigong/Sichuan University Science and Technology Cooperation Special Project(No.2018CDZG-14)。 

主　　题：Cemented carbides Microstructure Mechanical properties (Cr,Mo,Ta)_(2)(C,N) Electron backscattered diffraction(EBSD) 

摘      要：Grain growth inhibitors can effectively suppress the grain size of tungsten carbide(WC),and consequently improve the hardness and strength of the cemented carbides;however,the toughness,one of the most important properties,usually deteriorates with inhibitors.Here,(Cr,Mo,Ta)_(2)(C,N) synthesized by carbothermal reductionnitridation was used as a novel inhibitor,and its effects on the microstructure and mechanical properties of the cemented carbides were investigated.The results showed that the cemented carbides containing(Cr,Mo,Ta)_(2)(C,N)outperformed its counterpart comprising the traditional inhibitors in comprehensive mechanical properties,which was mainly attributed to the better inhibition performance provided by the(Cr,Mo,Ta)_(2)(C,N) solid-solution powders.With the content of(Cr,Mo,Ta)_(2)(C,N) increasing from 0 wt% to 1.25 wt%,the average grain size of WC in the cemented carbides decreased from 0.85 to 0.60 μm firstly,and then increased to 0.64 μm.With 1.00 wt%(Cr,Mo,-Ta)_(2)(C,N) addition,the cemented carbides with the best performance of hardness(HV_(30)) of 15.55 GPa,transverse rupture strength of 4272 MPa,fracture toughness of13.91 MPa·m1/2 were obtained.The electron backscattered diffraction(EBSD) measurements showed that cemented carbides with(Cr,Mo,Ta)_(2)(C,N) processed more amount of∑2 boundary compared with the other specimens,which contributed to better fracture resistance.