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首页> 外文会议>International Congress on Applications of Lasers and Electro-Optics >Laser Surface Alloying of Mn-Ni-Al Bronze for Cavitation Erosion Resistance
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Laser Surface Alloying of Mn-Ni-Al Bronze for Cavitation Erosion Resistance

机译：Mn-Ni-Al青铜的激光表面合金用于空化蚀阻抗性

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Cavitation erosion of a metal surface is caused by the repeated nucleation, growth and collapse of cavities in vibratory and high-speed flowing liquid. It occurs on surfaces including propellers, pipelines, valves, pump impellers and casings, many of which are made of copper alloys. In order to improve the cavitation erosion resistance of Mn-Ni-Al bronze (MAB), alloyed layers of Cr, Ni, Nb and Mo with MAB substrate were achieved by laser surface alloying (LSA) using a 2.5-kW continuous wave Nd:YAG laser. The laser-alloyed layers have a thickness of about 400 to 450 μm and exhibit very fine microstructure. The microstructure, hardness, corrosion, cavitation erosion resistance of the laser-alloyed specimens were studied and compared with the as-received MAB substrate. The micro-hardness of the alloyed layers was significantly increased. The cavitation erosion and corrosion behavior of the LSA coatings in 3.5% NaCl solution at 25°C was studied with a vibratory cavitation tester and a potentiostat. The cavitation erosion resistance of the alloyed layers was improved by at most 7.5 times that of the as-received MAB. In addition, the corrosion resistance of the alloyed layers was also enhanced as reflected by the shift in the corrosion potential and reduction in current density.
机译：金属表面的空化糜烂是由振动和高速流动液体中的重复核心，生长和塌陷引起的。它发生在包括螺旋桨，管道，阀门，泵叶轮和壳体的表面上，其中许多由铜合金制成。为了改善Mn-Ni-Al青铜（MAB）的空化蚀阻，通过使用2.5 kW连续波Nd，通过激光表面合金化（LSA）实现Cr，Ni，Nb和Mo的合金层Cr，Ni，Nb和Mo： YAG激光器。激光合金层的厚度为约400-450μm，并且具有非常精细的微观结构。研究了激光合金标本的微观结构，硬度，腐蚀，浮雕抗蚀性，并与接收的MAB底物进行比较。合金层的微硬度显着增加。研究了在25℃下的3.5％NaCl溶液中LSA涂层的空化糜烂和腐蚀行为，用振动空化测试仪和恒弓。通过最多的7.5倍的接收MAb的最多7.5倍改善合金层的空化腐蚀性。此外，通过腐蚀电位的变化和电流密度降低，还增强了合金层的耐腐蚀性。

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