Lu Pengfei, Xu Ziqi, Tian Ye, Yang Rui, Hu Kaixin, Li Hua, Yin Yanhong, Chen Xiuyong
Key Laboratory of Impact and Safety Engineering (Ministry of Education), School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China.
Zhejiang-Japan Joint Laboratory for Antibacterial and Antifouling Technology, Zhejiang Engineering Research Center for Biomedical Materials, Cixi Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
Materials (Basel). 2023 Feb 7;16(4):1392. doi: 10.3390/ma16041392.
Rough surfaces have been widely considered as negative factors affecting cavitation erosion resistance. However, this study presented the opposite result. Here, 316L stainless steel substrates and the arc-sprayed 316L stainless steel coatings were subjected to a specific grinding process that introduced scratches on the surfaces. The surface hardness values of these ground specimens were measured to evaluate the influence of the grinding-induced strain hardening. The cavitation erosion performance of the specimens was evaluated. The results showed that rough surfaces with scratches could enhance the cavitation erosion resistance, particularly at the early stage of cavitation erosion. The scratches had a greater effect on the cavitation erosion resistance of the coatings than on the substrates. Moreover, rough surfaces with initial surface scratches could extend the incubation period of the 316L stainless steel substrates due to the inhibition of the plastic deformation. The SEM observation showed that the scratch structure of the coating surface inhibited the growth of cracks and the propagation of cavitation pits. This study could also serve as a reference for investigating the cavitation erosion behaviors of materials with a particular surface feature.
粗糙表面一直被广泛认为是影响抗气蚀性能的负面因素。然而，本研究呈现了相反的结果。在此，对316L不锈钢基体和电弧喷涂316L不锈钢涂层进行特定的研磨处理，使表面产生划痕。测量这些研磨试样的表面硬度值，以评估研磨诱导的应变硬化的影响。评估了试样的气蚀性能。结果表明，带有划痕的粗糙表面可以提高抗气蚀性能，尤其是在气蚀初期。划痕对涂层抗气蚀性能的影响比对基体的影响更大。此外，具有初始表面划痕的粗糙表面由于抑制了塑性变形，可以延长316L不锈钢基体的孕育期。扫描电子显微镜观察表明，涂层表面的划痕结构抑制了裂纹的生长和气蚀坑的扩展。本研究也可为研究具有特定表面特征材料的气蚀行为提供参考。
