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Investigation of compaction by ring rolling on thermal sprayed coatings

机译：热喷涂涂层环轧制压实研究

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Often mechanical parts have specific requirements in regard to the underlying alloy. Especially for axial symmetric parts like rings an often requested characteristic is a different requirement on the inner surface than on the outer. Therefore, different production processes exist. One strategy is to roll a basic ring e.g., via radial-axial ring rolling (RARR), and create a functional layer afterwards via thermal spraying. The temperature of the ring and the spraying particles influence the bonding behavior and compaction of the thermal sprayed layer benefits its mechanical properties. The hypothesis presented in this paper is a better performing thermal sprayed layer regarding the adhesion of the layer, reduced porosity and improved residual compressive stress through the combination of the thermal spraying process and the radial-axial ring rolling. After an introduction to the industrial processes of radial-axial ring rolling and thermal spraying, the experimental setup and the results are presented. In the first step, the approach of combining these processes includes an experimental design, in which the rolling of the basic ring, consisting of a 1.0570-steel, gets interrupted right before the target diameter is reached. The ring is then transported to the thermal spraying process where the ring gets covered with layers of 316L-Si, sprayed with a pressure of 8 bar, arc voltage of 34.0 V and a wire feedrate of 2.1 m/min. The coated rings were rolled to two different target diameters with a planned degree of deformation of 0.025 and 0.098 only in the radial direction. This deformation leads to an elongation of the outer circumference of 2.56% and 10.26%. Due to the rolling process, the applied coatings revealed a compacting effect and, thus, a significant reduction in the total porosity. The main goal of this study is to investigate the material pairings and parameters regarding thermal spraying and RARR to produce an intact coating with adequate adhesion to the substrate. The long term vision is to adapt thermally sprayed coating into the radial-axial ring rolling process.
机译：通常，机械部件对底层合金具有特定要求。特别是对于像环的轴对称部件，通常所要求的特性是内表面上的不同要求而不是外部。因此，存在不同的生产过程。一种策略是通过径向轴向环轧制（RAR）滚动碱性环，然后通过热喷涂制造功能层。环和喷涂颗粒的温度影响热喷涂层的粘合行为和压实有益于其机械性能。本文提出的假设是通过热喷涂工艺和径向轴环轧制的组合，更好地表现出关于层的粘附性，降低孔隙率和改善的残余抗压应力的热喷涂层。在径向轴环轧制和热喷涂工业过程的介绍后，提出了实验设置和结果。在第一步中，组合这些方法的方法包括实验设计，其中由1.0570钢组成的基本环的轧制在达到目标直径之前被右转。然后将环输送到热喷涂过程，其中环被316L-Si的层覆盖，喷涂为8巴的压力，电弧电压为34.0V，焊丝进给率为2.1米/分钟。涂覆的环滚到两种不同的靶直径，在径向方向上仅具有0.025和0.098的计划变形度。这种变形导致外圆周的伸长率为2.56％和10.26％。由于轧制工艺，所施加的涂层揭示了压实效果，因此显着降低了总孔隙率。本研究的主要目的是研究关于热喷涂和RAR的材料配对和参数，以产生完整的涂层，其具有足够的粘附到基材。长期视觉是将热喷涂的涂层适应径向轴向环轧制工艺。

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