Research On Abrasion Resistance Of Titanium Alloy Ti13Nb13Zr By Laser Shock Texturing

The micro hole array can effectively improve the friction and wear properties of the material surface and prolong the life of the medical hip joint.Laser shock micro modeling is a new method of micro pits processing on the surface of materials by laser shock mechanics.Taking the titanium alloy Ti13Nb13 Zr as the research object,influence system of laser shock parameters on crater shape and surface friction properties,micro molding process parameter optimization design for laser shock optimization strategy.The main contents are as follows:(1)in hydrodynamic lubrication conditions,3D CFD simulation based on the effect of micro hole on the shape,depth,diameter,spacing,dislocation and other parameters on the surface of the oil film pressure distribution,the average film pressure dimensionless parameters.It is found that the elliptical micro pits have the best hydrodynamic lubrication performance in the range of parameters studied in this paper.With the increase of pit depth and diameter,the dimensionless average oil film pressure gradually increases and then tends to be stable.The existence of the best micro pits makes the oil film have the best dynamic lubrication performance.The dimensionless average oil film pressure tends to decrease with the increase of micro pit spacing.(2)the impact of laser micro texturing experiments based on the research of laser shock processing parameters(laser energy,shock times,spot diameter)of crater geometric parameters(depth,diameter)effect.It is found that the diameter and depth of micro pits increase with the increase of laser energy.With the increase of the number of shock,crater diameter,depth was gradually decreased,reached number 3 in the impact,because the material analysis of surface hardening effect,impulse saturation phenomenon,micro hole depth,diameter becomes large.(3)based on the Box-benhken experimental design,the effects of laser energy,micro hole spacing and dislocation on the friction and wear properties of titanium alloy were investigated under lubrication conditions.The effects of laser energy,micro hole spacing and micro pits dislocation on the friction and wear properties of micro pits were studied.The study found that with laser energy,micro hole spacing,micro pits of dislocations increases,the friction coefficient and wear other micro volume firstly decreased first increases the trend,there is an optimum parameters of textured surface friction and wear performance is best.In the laser energy of 1.5J,1.3mm,0.34 mm dislocation spacing,the minimum friction coefficient is 0.4393,the laser energy 1.5J,spacing 1.28 mm and dislocation 0.31 mm,wear to a minimum of 0.9988.The SEM analysis on the surface of the grinding marks shows that the wear form of the smooth surface is serious abrasive wear,adhesive wear and matrix accumulation,and the wear form of the micro surface is slight abrasive wear and adhesive wear,and the laser impact micro modeling can improve the friction and wear properties of the surface effectively.Dry friction and wear behavior of surface texturing,serious abrasive wear and adhesive wear;lubrication conditions,textured surface wear form is abrasive and adhesive wear.In summary,the hydrodynamic lubrication effect of laser shock micro molding surface can effectively improve the surface friction performance of titanium alloy.To explore the reciprocating frequency,load on the influence of micro pits array surface friction,wear properties of the study found that with the increase of reciprocating frequency,laser shock texturing surface friction coefficient,wear volume and wear depth were increased gradually.With the increase of normal load,the friction coefficient of laser shock molding surface decreases gradually,and the wear volume and wear depth increase gradually.