Design And Performance Study Of New Rare Earth Cemented Carbide Tool Material

The development of workpiece materials has contributed to the development of tool materials and the emergence of many new and difficult to machine materials has required the market to provide tool materials with better cutting performance so that productivity and machining quality can be improved during the cutting process.Tungsten cobalt carbide is a common carbide tool material,with the development of technology and the emergence of new cutting technology,the performance of traditional carbide is not enough to meet the demand,the addition of rare earth lanthanum(La)elements in tungsten cobalt carbide can make the additions and the original elements to form a complex structure,which further strengthens the overall structure and has a certain improvement on the comprehensive performance of the carbide.Firstly,based on the first nature principle,density flooding function(DFT)theory calculations were carried out using the CASTEP module in the calculation software Materials Studio to study the adhesion work,reaction enthalpy,density of states and charge density at the WC/WC-Co interface and the WC/WC-Co/La interface in a more systematic way.The computational analysis shows that more covalent bonds are generated near the La atoms at the interfacial bonding,which enhances the interfacial bonding strength and makes the whole structure more stable,and the cell after doping with La elements has better stability.The addition of La element to cemented carbide WC-Co results in a stable presence and grain refinement,which improves the overall stability of the material.Secondly,the WC/WC-Co cell and the WC/WC-Co/La cell are modelled and their elastic constants,thermodynamic properties and their charge calculations are analysed.By comparing the calculated analysis of the elastic constants of the cells before and after doping with La elements as well as the thermodynamic analysis,it was found that the overall structural properties changed and were interpreted from an electronic point of view.The element La was found to improve the overall stability of the cell while increasing the toughness of the cemented carbide material,which becomes more capable of withstanding impact and can work stably at high temperatures.Finally,tool preparation and material properties experiments were carried out based on the study of the interfacial strengthening mechanism and cell structure properties.By comparing the fracture and friction test results of the two carbides,it can be found that the WC particles are overall smaller in the La-doped carbide,which reduces the grain size and the rare earth La element has a purifying effect on the grain boundaries.The carbide doped with rare earth La elements showed better wear resistance,thus proving that the carbide doped with rare earth La elements has better wear resistance and toughness.This paper provides data on the performance enhancement of La element doped tungsten cobalt based cemented carbide through computational analysis and experimental verification,which can provide a reference for the addition of rare earth La elements to future cemented carbide tools.