One of the major problems encountered in hardened components such as roller bearings, which work under fatigue loading conditions, is that the requirement of higher surface finishes (≈0.15 µm Ra) cannot be achieved by the sequential hard turning and ball burnishing processes. Such high surface qualities can be generated by additional finishing operations such as grinding. However, despite the improvement in the surface roughness, the grinding process increases both the tensile surface residual stresses and crack initiation sites on the ground surface; therefore, the fatigue behavior of the component may deteriorate. In this study, the effects of adding a grinding operation before the ball burnishing process on the fatigue behavior of AISI 4130 steel were experimentally studied. According to the achieved results, the burnished pre-ground samples show a considerable reduction in the final surface roughness and, at the same time, higher microhardness, higher endurance limit, and smaller area of the fatigue cracking zone. The burnished pre-turned and burnished pre-ground samples showed 4.24% and 10.95% improvements in the endurance limit compared to that of the turned samples, respectively.

中文翻译：

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使用连续硬车削、磨削和球抛光操作改善硬化零件的疲劳行为

在疲劳载荷条件下工作的滚子轴承等硬化部件遇到的主要问题之一是，通过连续硬车削和滚珠抛光工艺无法实现更高的表面光洁度 (≈0.15 µm Ra)。如此高的表面质量可以通过额外的精加工操作（例如研磨）产生。然而，尽管表面粗糙度有所改善，但磨削过程增加了表面拉伸残余应力和磨削表面的裂纹萌生点；因此，部件的疲劳行为可能会恶化。在这项研究中，实验研究了在球抛光过程之前添加研磨操作对 AISI 4130 钢疲劳行为的影响。根据取得的成果，抛光的预研磨样品显示出最终表面粗糙度的显着降低，同时具有更高的显微硬度、更高的耐久极限和更小的疲劳裂纹区面积。与车削样品相比，抛光预车削和抛光预磨削样品的耐久极限分别提高了 4.24% 和 10.95%。