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

Titanium alloy Ti13Nb13 Zr has good corrosion resistance,biocompatibility and low elastic modulus,and it is preferred material for human bone replacement.However,the wear resistance of titanium alloy is poor,which seriously restricts the application of titanium alloy.In this paper,the deformation effect and strengthening effect of laser shock technology was used to improve the friction performance of materials.The main research works are as follows:(1)The relationship between the improvement of mechanical property and wearresisting property was discussed based on single point laser micro shock experiment.The nano-hardness of titanium alloy surface layer was improved obviously significantly.The growth rate is 48.2% compared with the matrix hardness;Titanium alloy Ti13Nb13 Zr after LS has a certain depth of grain refining layer,the strength of titanium alloy is enhanced by the appearance of much basketweave microstructure in the grain refining layer,and grain refinement also increases the yield strength of the material,the maximun depth of affected layer is 88.36?m.The simulation results show that the LS induced deep and high residual stress in the titanium alloy.(2)The friction and wear mechanism of textured surface was discussed and explored based on multipoint laser micro shock experiment and dry friction test.The results show that the textured surface has lower friction coefficient,Mass and depth,width of wear scar compared with untextured surface.The results of untreated surface scar SEM analysis show that the untreated surface wear behavior is adhesive wear and abrasive wear,fatigue wear;The treated surface surface wear behavior is abrasive wear and adhesive wear,but wearing degree is relatively light.(3)The friction coefficient and mass of the Box-benhken experimental design response value were fitted and analyzed.The results show that with the increase of laser energy,the friction coefficient and mass increases first and then decreases;With the increase of dimple dislocation,the friction coefficient and mass increases gradually;With the increase of dimple distance,the friction coefficient and mass increases first and then drcreases slowly,and the friction coefficient and mass are the smallest at the distance of 1.5mm;Based on the optimized analysis of the friction coefficient and mass process parameters of laser energy,distance and dislocation both are(1.2J,1.6mm,0.4mm).(4)The influence of working conditions on the surface friction performance was investigated by changing the speed,load and time.The results show that with the increasement of rational speed the friction coefficient,mass decreases first and then increases and when the rational speed is 100r/min,the minimum value is obtained;The friction coefficient,mass increases with the increasement of load and time.The dpeth and width of wear scar increases with the increasement of rational speed,load and time.(5)The effect of lubrication effect on the friction performance of textured surface was discussed based on dry friction test and lubricant friction test.The results show that the friction coefficient,mass and depth of wear scar and width of wear scar of textured surface is lower under lubrication conditions.The decreasing amplitude of depth of wear scar is obvious,decreased by 3.3 times.The wear behavior of textured surface is mainly adhesive wear under lubrication conditions.