The hydraulic runners and many other components are exposed to cavitation phenomena and the erosion occurs, and normally are repaired by arc welding processes. However, the heat input from the welding causes microstructural changes in the components materials. Considering the martensitic stainless steel CA6NM, the welding thermal cycle reduces its fracture toughness and consequently the structural integrity of the equipment. Thermally sprayed coatings are an alternative to repair low eroded areas of these components, since the thermal sraying processes do not change the substrate microstructure and/or mechanical properties as the welding process. Different FeMnCrSi alloys deposited by Twin-Wire Electric Arc (TWEA) or High-Velocity Oxy-Fuel (HVOF) are on development and their cavitation resistance, comparable to the substrate CA6NM, are the object of the study in this research. This work presents the comparison of the deposition characteristics and properties of different FeMnCrSi alloys chemical compositions coatings obtained by TWEA and HVOF processes, evaluating the particles in-flight, morphology, hardness, adherence, and cavitation resistance of the coatings.

中文翻译：

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双丝电弧和高速氧燃料工艺沉积的 FeMnCrSi 抗空化涂层的比较

液压滑道和许多其他部件暴露于气蚀现象并发生腐蚀，通常通过弧焊工艺修复。然而，焊接的热量输入会导致部件材料的微观结构发生变化。考虑到马氏体不锈钢 CA6NM，焊接热循环会降低其断裂韧性，从而降低设备的结构完整性。热喷涂涂层是修复这些部件的低侵蚀区域的替代方法，因为热喷涂工艺不会像焊接工艺那样改变基材的微观结构和/或机械性能。通过双线电弧 (TWEA) 或高速氧燃料 (HVOF) 沉积的不同 FeMnCrSi 合金正在开发中，它们的抗气蚀性与基材 CA6NM 相当，是本研究的研究对象。这项工作比较了通过 TWEA 和 HVOF 工艺获得的不同 FeMnCrSi 合金化学成分涂层的沉积特性和性能，评估了涂层的飞行颗粒、形态、硬度、附着力和抗气蚀性。