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Cladding of Ni-20Cr Coatings by Optimizing the CO_2 Laser Parameters

机译:通过优化CO_2激光参数覆盖Ni-20cr涂层

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摘要

Ni-20Cr alloy was deposited on stainless steel using air plasma spray. Inherent defects in coating like porosity, oxides and splat boundaries are considered as potential sources for oxygen ingress during high-temperature application. In order to minimize such flaws, the plasma-sprayed coating was remelted and solidified, using continuous wave CO_2 laser. Microstructural optimization was achieved by optimizing process parameters such as laser power and defocus distance. The laser-treated surfaces were characterized using optical and scanning electron microscopy as well as by XRD. At 500Wpower, a 60mm defocus distance was found to be optimum to avoid outward diffusion of iron. However, stresses were observed to be present in the plasma-sprayed coating before and after laser remelting and solidification, as determined by XRD of the treated samples.
机译:使用空气等离子体喷雾沉积Ni-20Cr合金。孔隙率,氧化物和平移边界的固有缺陷被认为是高温施用期间氧进入的潜在来源。为了使这种缺陷最小化,使用连续波CO_2激光来重新熔化并固化等离子体喷涂涂层。通过优化激光功率和散焦距离的过程参数来实现微结构优化。使用光学和扫描电子显微镜以及XRD表征激光处理的表面。在500wpower下,发现60mm的散焦距离是最佳的,以避免外侧的铁。然而,观察到在激光重熔和凝固前后的等离子体喷涂涂层中存在应力,通过处理的样品的XRD测定。

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