By combining different materials, for example, high-strength steel and unalloyed structural steel, hybrid components with specifically adapted properties to a certain application can be realized. The mechanical processing, required for production, influences the subsurface properties, which have a deep impact on the lifespan of solid components. However, the influence of machining-induced subsurface properties on the operating behavior of hybrid components with a material transition in axial direction has not been investigated. Therefore, friction-welded hybrid shafts were machined with different process parameters for hard-turning and subsequent deep rolling. After machining, subsurface properties such as residual stresses, microstructures, and hardness of the machined components were analyzed. Significant influencing parameters on surface and subsurface properties identified in analogy experiments are the cutting-edge microgeometry, $\overline{S}$, and the feed, f, during turning. The deep-rolling overlap, u, hardly changes the residual stress depth profile, but it influences the surface roughness strongly. Experimental tests to determine fatigue life under combined rolling and rotating bending stress were carried out. Residual stresses of up to −1000 MPa, at a depth of 200 µm, increased the durability regarding rolling-contact fatigue by 22%, compared to the hard-turned samples. The material transition was not critical for failure.

中文翻译：

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混合滚子轴承组件的与生产相关的表面和亚表面特性以及疲劳寿命

通过组合不同的材料，例如高强度钢和非合金结构钢，可以实现具有针对特定应用的特定性能的混合组件。生产所需的机械加工会影响表面下的性能，这对固体部件的使用寿命产生了深远的影响。但是，尚未研究机加工引起的地下特性对轴向上材料过渡的混合零件的工作行为的影响。因此，对摩擦焊接的混合轴进行了不同的工艺参数加工，以进行硬车削和随后的深轧。加工后，分析了表面性能，例如残余应力，微观结构和加工部件的硬度。$\overline{\mathrm{小号}}$，以及车削时的进给f。深轧重叠量u几乎不会改变残余应力深度分布，但会严重影响表面粗糙度。进行了确定组合滚动和旋转弯曲应力下的疲劳寿命的实验测试。与硬车削样品相比，在200 µm的深度处，高达-1000 MPa的残余应力使滚动接触疲劳的耐久性提高了22％。材料过渡对于失效而言并不重要。