高速钢仿生表面的摩擦磨损特性

Friction and wear behavior of bionic surface on high speed steel

应用激光加工技术在W6Mo5Cr4V2高速钢试样表面加工出规则排列的仿生形态,测量光滑试样、凹坑型试样和凸包型试样的表面显微硬度、磨损量和摩擦因数,并观察表面磨损形貌。结果表明:与光滑试样相比,具有仿生形态试样的磨损量减少,摩擦因数降低,其中,凹坑型试样的磨损量最低,凸包型试样的摩擦因数最小。在仿生形态试样的表面观察到划痕,在光滑试样表面观察到黏着、剥落和划痕。仿生单元体的硬度增大,材料表面软硬交替,参与磨损的磨屑由滑动转变为滚动,以及凹坑的容屑作用,有助于改善高速钢仿生表面的耐磨性。

Bionic concaves and convexes with regular arrangement on W6Mo5Cr4V2 high speed steel specimen surfaces were fabricated with laser processing method. Microhardness of common specimen,concave specimen and convex specimen,was measured. The wear loss and friction coefficient of three kinds of specimens worn with ball were tested. Worn surface morphologies were observed. The results show that compared with common specimen,wear loss and friction coefficient of bionic specimens are decreased. Of three kinds of specimens,the wear loss of concave specimen is the least,friction coefficient of convex specimen is the lowest. Scratches can be observed on the surface of bionic specimen. The sticking,stripping and scratches phenomena can be observed on worn surfaces of common specimen. Hardness improvement of bionic elements,surface hardness variation,wear debris movement from sliding into rolling,and chip- holding effect of concave specimen,are contributed to wear resistance improvement of bionic surface on high speed steel.