Friction and Wear Properties of Wheel Partially Repaired by 304L Stainless Steel Laser Cladding under Different Temperature and Humidity Conditions

Cl60 steel wheel samples were partrally repaired by laser cladding 304L stainless steel. The friction and wear properties of repaired wheel samples under different temperature and relative humidity conditions (25 ℃, 60%; 50 ℃, 60%; 50 ℃, 90%) were studied. The results show that the higher the temperature, the smaller the stable friction factor; the relative humidity had almost no effect on the stable friction factor at 50 ℃. The higher the temperature or the lower the relative humidity, the greater the wear mass loss and crack length and angle of the partical repaired wheel. Under the 25 ℃ and 60% relative humidity condition, the bond zone between the cladding layer and the matrix on surface of the wheel had large material spalling and multi-layer cracks with small angles near the matrix, the cracks propagated inward, and the damage was serious. When the humidity was kept at 60% and the temperature increased to 50 ℃, the damage degree of the cladding layer was reduced, and there was an obvious dividing line and no obvious cracks in the bond zone. When the temperature increased to 50 ℃ and the relative humidity increased to 90%, no obvious damage existed in the cladding layer, the bond zon had a few spalling pits and the boundary between the cladding layer and matrix was clear.