Different studies have been demonstrated that the surface integrity of substrate bulk materials to be coated has a significant impact on the adhesion of thermally sprayed coatings. It is known that the surface integrity of parts processed by selective laser melting (SLM) differs from those obtained from bulk materials. Although 316L stainless steel is among the most investigated material for SLM, the adhesion of thermally sprayed coatings on 316L stainless steel substrates processed by SLM has not been studied yet. This study aims at evaluating the effect of various mechanical pre-treatments onto 316L stainless steel substrates processed by SLM and their effect on the adhesion of high velocity oxy-fuel (HVOF)-sprayed WC-Co coatings. To differentiate between topographical effects and residual stress-related phenomena, a stress-relief heat treatment of the SLM substrates served as a reference throughout the investigations. The differently pre-treated SLM substrates were investigated with regard to the surface roughness and residual stresses. For the HVOF-sprayed SLM composites, Vickers interfacial indentation tests were conducted to assess the resulting coating adhesion. The findings demonstrated that the HVOF-sprayed WC-Co coatings predominantly exhibit good adhesion to the SLM 316L substrates. However, it was found that the stress state in the SLM 316L substrate surface is more likely to affect the adhesion of the WC-Co coating, while the substrate surface roughness showed a marginal effect.

中文翻译：

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HVOF 喷涂 WC-Co 涂层在 SLM 处理的 316L 基材上的附着力

不同的研究已经证明，待涂覆的基材散装材料的表面完整性对热喷涂涂层的附着力有显着影响。众所周知，通过选择性激光熔化 (SLM) 加工的零件的表面完整性不同于从散装材料中获得的零件。尽管 316L 不锈钢是 SLM 研究最多的材料之一，但尚未研究热喷涂涂层在 SLM 处理的 316L 不锈钢基材上的附着力。本研究旨在评估各种机械预处理对 SLM 处理的 316L 不锈钢基材的影响及其对高速氧燃料 (HVOF) 喷涂 WC-Co 涂层附着力的影响。为了区分地形效应和残余应力相关现象，SLM 基板的应力消除热处理作为整个研究的参考。研究了不同预处理的 SLM 基材的表面粗糙度和残余应力。对于 HVOF 喷涂的 SLM 复合材料，进行了维氏界面压痕测试以评估所得涂层的附着力。研究结果表明，HVOF 喷涂的 WC-Co 涂层主要表现出对 SLM 316L 基材的良好附着力。然而，发现SLM 316L基材表面的应力状态更有可能影响WC-Co涂层的附着力，而基材表面粗糙度则表现出边际效应。研究了不同预处理的 SLM 基材的表面粗糙度和残余应力。对于 HVOF 喷涂的 SLM 复合材料，进行了维氏界面压痕测试以评估所得涂层的附着力。研究结果表明，HVOF 喷涂的 WC-Co 涂层主要表现出对 SLM 316L 基材的良好附着力。然而，发现SLM 316L基材表面的应力状态更有可能影响WC-Co涂层的附着力，而基材表面粗糙度则表现出边际效应。研究了不同预处理的 SLM 基材的表面粗糙度和残余应力。对于 HVOF 喷涂的 SLM 复合材料，进行了维氏界面压痕测试以评估所得涂层的附着力。研究结果表明，HVOF 喷涂的 WC-Co 涂层主要表现出对 SLM 316L 基材的良好附着力。然而，发现SLM 316L基材表面的应力状态更有可能影响WC-Co涂层的附着力，而基材表面粗糙度则表现出边际效应。研究结果表明，HVOF 喷涂的 WC-Co 涂层主要表现出对 SLM 316L 基材的良好附着力。然而，发现SLM 316L基材表面的应力状态更有可能影响WC-Co涂层的附着力，而基材表面粗糙度则表现出边际效应。研究结果表明，HVOF 喷涂的 WC-Co 涂层主要表现出对 SLM 316L 基材的良好附着力。然而，发现SLM 316L基材表面的应力状态更有可能影响WC-Co涂层的附着力，而基材表面粗糙度则表现出边际效应。