材料科学
涂层
冶金
因科镍合金625
因科镍合金
铸铁
合金
气动冷喷涂
热喷涂
镍
氧化物
图层(电子)
基质(水族馆)
扩散
复合材料
海洋学
物理
热力学
地质学
作者
Adrian Wei-Yee Tan,Nataniel Yong Syn Tham,Yao Shian Chua,Kaiqiang Wu,Wen Sun,Erjia Liu,Sung Chyn Tan,Wei Zhou
出处
期刊:Coatings
[Multidisciplinary Digital Publishing Institute]
日期:2022-06-02
卷期号:12 (6): 765-765
被引量:16
标识
DOI:10.3390/coatings12060765
摘要
Cold spray is an emerging additive manufacturing process that allows particles to be coated onto the surface of a base material without melting. It is suitable to repair components made from temperature-sensitive materials, such as grey cast iron, which cannot be easily restored using conventional methods like welding or thermal spray. In this study, the nickel-based alloy Inconel 625 was successfully coated onto a grey cast iron (GJL250) using a cold spray process, and extensive experiments were carried out to study the effects of diffusion between the coating and the substrate after heat treatment at 400, 600, 850 and 1050 °C for 3 and 6 hours durations. The coatings in all conditions were dense (0.25% to 3%) and had defect-free interfaces. Under heat treatment, the diffusion layer increased in thickness with increasing temperature and duration due to atomic diffusion. The Inconel 625 coating is also shown to be effective against oxide growth as compared to grey cast iron. The hardness of the coatings is also stable at high temperatures. The heat-treated coatings at 600 °C achieved a peak hardness of around 500 HV, which is 30% and 60% higher than the as-sprayed coating and grey cast iron substrate, respectively, because of the possible formation of recrystallized nanostructured grains and strengthening precipitates. These findings demonstrate the potential application of using cold spray on nickel-based alloy coatings for restoration and surface enhancement of grey cast iron components, such as engine blocks and pump housings.
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