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首页> 外文期刊>Journal of Materials Engineering and Performance >Cobalt-Free Laser Cladding on AISI Type 316L Stainless Steel for Improved Cavitation and Slurry Erosion Wear Behavior
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Cobalt-Free Laser Cladding on AISI Type 316L Stainless Steel for Improved Cavitation and Slurry Erosion Wear Behavior

机译：AISI 316L不锈钢上的无钴激光熔覆可改善空化和浆液侵蚀磨损行为

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摘要

Laser cladding of Colmonoy-5 (a nickel base alloy) and Metco-41C (an iron base alloy) on AISI type 316L stainless steel (SS316L) and their wear behaviors were investigated to establish Co-free clad layers for potential applications in nuclear industry. A 3.5 kW CO2 laser-based system was used to optimize the laser cladding on SS316L substrate. The observed optimum parameters were: laser power of 1.6 kW, scan speed of 0.6 m/min, and powder feed rate of 8 g/min with 60% overlapping. The microstructure studies revealed that the clad layers primarily comprise very fine columnar dendritic structures, while clad-substrate interface exhibited planar and non-epitaxial mode of solidification due to high cooling rates. The cavitation and slurry erosion behaviors of laser clad layers were also compared to that of Stellite-6 for potential direct replacement. The cavitation erosion resistance was improved by a factor of 1.6, 3.7, and 4.1, while the slurry erosion resistances at an impingement angle of 30A degrees were 1.5, 4.8, and 1.8 times better for laser clad surfaces of Colmonoy-5, Metco-41C, and Stellite-6, respectively, as compared to that of bare SS316L substrate. The study demonstrated that Metco-41C is a better choice as Co-free clad material for potential nuclear applications.
机译：研究了AISI 316L不锈钢（SS316L）上的Colmonoy-5（镍基合金）和Metco-41C（铁基合金）的激光熔覆及其磨损行为，以建立无钴熔覆层，可用于核工业中的潜在应用。使用基于3.5 kW CO2激光的系统来优化SS316L基板上的激光熔覆。观察到的最佳参数是：1.6 kW的激光功率，0.6 m / min的扫描速度和8 g / min的粉末进料速度，重叠60％。微观结构研究表明，包覆层主要包含非常细的柱状树枝状结构，而包覆层与基材的界面由于高冷却速率而呈现出平面和非外延凝固模式。还比较了激光熔覆层的空化和浆液侵蚀行为与Stellite-6的潜在直接替代性能。对于Colmonoy-5，Metco-41C的激光熔覆表面，抗气蚀性分别提高了1.6、3.7和4.1倍，而在30A度的撞击角下的抗浆蚀性分别提高了1.5、4.8和1.8倍和裸SS316L基板相比，分别为Stellite-6和Stellite-6。研究表明，对于潜在的核应用，Metco-41C作为不含Co的复合材料是更好的选择。

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