ABSTRACT

The cavitation erosion resistance of high-entropy FeCoCrNiMo_XB_0.2(X = 0, 0.5, 1), coatings cladded by laser was studied. The test was processed by a magnetostrictive cavitation method in both distilled water and 3.5 wt-% NaCl solution. It was observed that the mass-loss rate of the coatings rarely increased or even decreased in the first few hours. This study verified that the formation of cavitation pits and extend of cracks due to the mechanical shock were the dominant factors causing cavitation of the coatings. The additional Cl^– exhibited a deteriorative effect on the cavitation erosion performance of this high-entropy alloy coating, which leads to an increase of the mass-loss in NaCl solution than that in distilled water. Moreover, the hardness and stability of the high-entropy coatings were enhanced owing to the increase of Mo content, thus improving the cavitation erosion resistance.

摘要

研究了高熵FeCoCrNiMo _X B _0.2 ( X  = 0, 0.5, 1), 激光熔覆涂层的抗气蚀性能。该测试是通过磁致伸缩空化法在蒸馏水和 3.5% 的 NaCl 溶液中进行的。据观察，涂层的质量损失率在最初的几个小时内很少增加甚至减少。该研究证实了由于机械冲击引起的空化坑的形成和裂纹的扩展是导致涂层空化的主要因素。额外的 Cl ^–对这种高熵合金涂层的空蚀性能表现出恶化的影响，导致在 NaCl 溶液中的质量损失比在蒸馏水中的质量损失增加。此外，由于Mo含量的增加，高熵涂层的硬度和稳定性得到提高，从而提高了抗空蚀性。