Effect of Pre-strain on Surface Roughening and Frictional Behavior of DP590 High-Strength Steel

The surface roughening behavior under uniaxial tension is manifested as newly added micro-valleys and micro-mountains. The total strain experienced by the material during plastic deformation is an important factor in determining surface roughness. The surface roughness of DP590 increases with the increase in strain. Moreover, the inhomogeneity of the initial orientation of the experimental material leads to the incompatibility of the strain between adjacent grains during the plastic deformation process, which affects the surface morphology of the material, and the roughening of the surface is closely related to the (112) [110] orientation. Furthermore, the friction behavior under lubricated conditions is almost the same whether the surface is rough or not: The frictional stress increases linearly with the average pressure, then shows a slight decrease, and finally increases linearly again.