Surface Integrity of AISI 4140 After Deep Rolling with Varied External and Internal Loads

To achieve favorable surface and subsurface properties by means of compressive stresses, low surface roughness and strain hardened microstructures, deep rolling is a well-established manufacturing process. To gain a better understanding regarding the correlations between the rolling forces (external load), the resulting Hertzian stresses (internal material load), and the modification of surface and subsurface properties, in this paper, deep rolling parameters were varied in a defined way under consideration of the correlations between external and internal loads. It is shown that at identical external loads, different surface and subsurface properties may result due to a defined variation of the internal loads.