| Abstract: | Microstructure and mechanical properties of a high strength bearing steel SAE 52100 produced by spray deposition Spray depositing allows the production of steels having a structure which is free of any macro‐segregation, homogeneous and equiaxed. Nevertheless the spray deposition of steels shows some effects that have to be regarded as disadvantages. A porous region at the billet border and a rather coarse‐grained microstructure can be noticed. As a result, in the presented work the influence of a subsequent hot rolling and a following heat treatment on microstructure and mechanical properties has been investigated. For this purpose the bearing steel SAE 52100 has been used as master material. The initial microstructure has been transformed to a homogeneous equiaxed fine‐grained pearlitic microstructure without any remaining porosity. To get use of the characteristic properties of this high‐strength steel an isothermal bainitic hardening has been carried out. Information about the mechanical properties of this material has been gained by tensile and fatigue tests. For fatigue tests in the longitudinal and cross direction of the hot rolled bars a special miniature specimen has been developed. |
