Due to an outstanding combination of high strength and fracture toughness Maraging steels are used in numerous industries, e.g., in the aerospace sector. The high strength can be attributed to precipitation strengthening by conventional age-hardening heat treatments. However, as many of the envisaged applications will suffer from cyclic loadings, the fatigue properties are of significant interest in terms of a reliable use. Generally, Maraging steels are characterized by a relatively low fatigue strength limiting the use in certain applications. In this context, mechanical surface treatment processes are promising candidates to overcome these challenges. In particular, deep rolling represents a suitable process, as it is known for increased depth effects as well as smoother surface profiles compared to other mechanical surface treatment processes. Moreover, aging heat treatments can easily be implemented into the process. Accordingly, the present study focuses on near-surface and mechanical properties of a Maraging C250 steel after deep rolling. Characterization of the near-surface area was conducted by X-ray diffraction and hardness measurements. Mechanical properties were assessed by tensile and fatigue tests. The results presented reveal a great potential of the integration of an aging heat treatment into the deep rolling process eventually leading to significant process time reduction.

中文翻译：

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不同温度深轧对马氏体时效C250钢近表面和力学性能的影响

由于高强度和断裂韧性的出色结合，马氏体时效钢被用于许多行业，例如航空航天领域。高强度可归因于传统时效硬化热处理的沉淀强化。然而，由于许多设想的应用将遭受循环载荷，因此疲劳性能对于可靠使用而言具有重要意义。一般来说，马氏体时效钢的特点是疲劳强度相对较低，限制了其在某些应用中的使用。在这种背景下，机械表面处理工艺是克服这些挑战的有希望的候选者。特别是，深滚压代表了一种合适的工艺，因为与其他机械表面处理工艺相比，深滚压具有增加的深度效应以及更光滑的表面轮廓。此外，时效热处理可以很容易地实施到该过程中。因此，本研究重点关注深轧后马氏体时效 C250 钢的近表面和机械性能。通过 X 射线衍射和硬度测量来表征近表面区域。通过拉伸和疲劳测试评估机械性能。研究结果揭示了将时效热处理整合到深轧工艺中的巨大潜力，最终导致工艺时间显着缩短。