Research On Grinding Mechanism And Surface Quality Of High Entropy Alloys

High-entropy alloys,as a new material emerging at the end of the 20th century,have received close attention from countries around the world.High-entropy alloy breaks the shackles of traditional alloys,and its biggest feature is that it consists of five elements with basically the same content.Due to the large number of elements,a variety of compounds are formed,making the cocktail effect a unique advantage of high-entropy alloys.High-entropy alloys have better physical properties than traditional alloys,and they are more prominent in their ability to resist oxidation and corrosion.As a new material,high-entropy alloy is necessarily different from traditional alloys in terms of removal mechanism and mechanical processing methods.Therefore,in order to make this material with excellent properties to play the greatest role in the future development,we must continue to explore and study its mechanical processing.The main research contents of the thesis include:(1)Study on the grinding mechanism and related theoretical research of high entropy alloys,explore the slip form of internal distortion lattice of high entropy alloys under the action of grinding force,and study the plastic shear slip effect of materials during the grinding process Removal mechanism.By observing the morphology of the wear debris and analyzing the microstructure of the subsurface,the formation conditions of the wear debris of the high entropy alloy are explained,and then a new mechanism for removing the high entropy alloy material is revealed.Relevant theories include the construction of the maximum undeformed chip thickness,the critical cutting thickness,and the theoretical model of high-entropy alloy grinding force.(2)Finite element simulation of high entropy alloy grinding process.Deform finite element simulation is used to complete the three-dimensional model construction of high entropy alloy grinding process.The grinding force and heat generated and distribution during the grinding of high entropy alloy are studied..Investigate the influence of different process conditions(grinding speed,grinding depth,feed rate)on the grinding force and grinding heat of high-entropy alloys,and comprehensively analyze the wear resistance and heat resistance of high-entropy alloys.(3)The experimental study of the grinding force of high entropy alloys uses orthogonal experiments and single factor experiments.For two different high-entropy alloys,the influence of grinding parameters on their grinding forces was studied,and the change law of grinding forces with different machining parameters was found,which was compared with the finite element simulation..(4)Experimental research on the surface processing quality of high-entropy alloy grinding.Through experiments,the change law of the surface quality(surface roughness,surface hardness,etc.)of high-entropy alloys with different structures under different grinding process parameters is analyzed.The method of orthogonal experiment and single factor experiment is used to carry out experimental research on the multiple grinding process parameters of high-entropy alloys,analyze the correlation of influencing factors,and find out process plan for cutting.that it can generate high precision and good surface quality.