Effect of N Content and Cubic Phase Composition on the Structure of Gradient Cemented Carbide-Computer Simulation and Experimental Investigation
The influences of N content and total cubic phase content(particularly here raises Ta+Nb volume with Ta/Nb ratio and Ti content kept)on the thickness of gradient layer and the chemical composition of surface layer of cemented carbide were studied by theoretical calculation and experimental investigations.Volumes of each phase in alloy and chemical composition distributions in surface layer were calculated by DICTRA software.The microstructure and elements concentration distribution were analyzed via Scanning Electron Microscope(SEM)and Energy Dispersive Spectrometer(EDS),respectively.The simulation result shows a good agreement with the experimental results.The thickness of face-centered cubic phase free layer(fcc-free layer)decreases as the volume fraction of cubic phase increasing,while increases as improving N content.Cubic phase volume exhibits more remarkably effect on microstructure of fcc-free layer than N content does.As N content and cubic phase volume increasing,N activity goes up and N decomposition becomes faster.The denitrification process in cemented carbide closely correlates with the cubic phase and N composition in alloy.
Cemented carbide fcc-free layer thermos-dynamics computer simulation
Wang Shequan Li Ping Xie Wen Li Yuanyuan Du Yong
Zhuzhou Cemented Carbide Cutting Tools Co.,Ltd.,Zhuzhou Hunan 412007,China;State Key Laboratory of C State Key Laboratory of Powder Metallurgy,Central South University,Changsha Hunan 410083,china
国际会议
北京
英文
858-869
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）