激光织构GCr15钢油润滑摩擦磨损性能试验

Experimental Study on Friction and Wear Properties of Laser-textured GCr15 Steel Under Oil Lubrication Condition

采用DP-75F型半导体泵浦激光打标机,在高碳铬轴承钢GCr15表面进行了激光微织构加工,然后在MFT-5000型多功能在线测量材料摩擦磨损试验机上对织构试件进行油润滑条件下的摩擦磨损性能试验。研究了方孔、圆孔和三角孔微造型的面积率、孔深等几何参数以及载荷、摩擦副往复运动频率等工况条件对油润滑条件下的GCr15表面摩擦磨损特性的影响。结果表明:油润滑条件下存在最优的微造型面积率和孔深,使GCr15造型表面的摩擦系数最小、磨损量最少,载荷越大,摩擦系数和磨损量越大,摩擦副往复运动频率越大,摩擦系数减小,磨损量增大;圆孔织构表面的摩擦磨损性能明显优于方孔和三角孔织构表面。

The dimples were fabricated on surfaces made of GCr15 bearing steel using a DP-75F semiconductor pump laser marking machine.And then a reciprocating friction test was carried out to investigate the friction and wear of the surfaces with the square,circular and equilateral triangular dimples under oil lubrication conditions by an MFT-5000 multi-function tribometers.The effects of geometric parameters such as texturing area ratio and pore depth of these types of dimples,and working conditions such as normal load and reciprocating frequency of the friction pair were investigated to reveal the friction and wear properties for the laser-textured surface.The experimental results show that there exist an optimal texturing area ratio and pore depth minimizing the friction coefficient and wear loss of the textured surface under oil lubrication conditions,a greater normal applied load induces a larger friction coefficient and a larger wear loss,and a faster reciprocating frequency generates a smaller friction coefficient and a larger wear loss.Moreover,the friction and wear for the surface with the circular dimples are distinctly less than the corresponding values for the surface with the square or triangular dimples.