铸态和LPBF印刷铬镍铁板在海水环境中的组织演变及防腐性能

IF 1.2 4区材料科学 Q4 CHEMISTRY, PHYSICAL

Surface Review and Letters Pub Date : 2023-11-08 DOI:10.1142/s0218625x2450032x

N. Jeyaprakash, Che-Hua Yang, Sundara Subramanian Karuppasamy, N. Radhika

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引用次数: 0

摘要

因科乃尔718 (in718)属于镍基高温合金，具有强度高、耐蚀性好、硬度高、耐疲劳、耐磨损等突出的机械特性。该合金主要用于制造航空发动机、核反应堆、航天飞机、增压锅炉等部件。在大多数情况下，由这种合金制成的零件在恶劣的侵蚀环境中工作。这种合金长时间暴露在这样的环境中，将为腐蚀现象铺平道路，这将减少部件的使用寿命。据报道，通过增材制造制造的零件将比铸造和锻造的零件表现出更好的机械特性。本工作旨在研究铸态和LPBF打印的IN 718样品在海水环境中不同时间间隔的防腐特性。利用FESEM显微形貌分析了铸态和LPBF印刷in 718试样的组织演变。在含3.5 wt.% NaCl(海水)的环境中，研究了两种样品的EIS、动电位极化曲线和腐蚀形貌的抗腐蚀特性。结果表明，LPBF打印的IN 718样品具有细小的胞状和柱状晶粒，沿其边界装饰有NbC析出物，而铸造样品的晶粒较大且较粗，NbC析出物偏析不均匀。从Tafel和EIS (Nyquist和Bode)图来看，LPBF IN 718样品在电流密度和极化电阻值方面表现出更强的耐腐蚀性。特别是，15h LPBF样品在其上形成了一层坚固、致密的钝化膜。与其他间隔的LPBF和铸态样品相比，这种致密的被动膜使样品具有更低的电流密度(3.03 × 10[公式:见文]A/ cm2)和更高的极化电阻(3678[公式:见文]cm2)。

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Microstructural evolution and anti-corrosion characteristics of as-cast and LPBF printed Inconel plates in seawater environment

Inconel 718 (IN 718) belongs to the category of nickel-based superalloys with outstanding mechanical characteristics such as high strength, better corrosion resistance, greater hardness, fatigue and wear resistance. This alloy is mostly implemented in manufacturing the components of aeroengines, nuclear reactors, space shuttles, pressurized boilers and so on. In most cases, the parts made from this alloy work in severe aggressive environments. A prolonged exposure of this alloy in such environments will pave the way for corrosion phenomenon which will minimize the service life of the components. It is reported that the parts made via additive manufacturing will exhibit better mechanical characteristics than the casted and forged parts. This work is aimed to investigate the anti-corrosion characteristics of both as-cast and LPBF printed IN 718 samples at various time intervals in the seawater environment. By means of FESEM micrographs, the microstructural evolution in both as-cast and LPBF printed IN 718 samples was analyzed. The anti-corrosion characteristics of both samples were investigated in the environment containing 3.5 wt.% NaCl (seawater) in terms of EIS and potentiodynamic polarization curves along with the corroded morphology. The results showed that the LPBF printed IN 718 samples exhibit fine cellular and columnar grains decorated with the NbC precipitates along their boundaries, whereas the casted samples have larger and coarser grains with uneven segregation of NbC precipitates. From the Tafel and EIS (Nyquist and Bode) plots, the LPBF IN 718 sample showed greater corrosion resistance in terms of current density and polarization resistance values. In particular, the 15 h LPBF sample has a strong, compact passive film formed on it. This compact passive film paved the way for this sample to exhibit lower current density (3.03 × 10[Formula: see text]A/cm 2 ) and higher polarization resistance (3678 [Formula: see text] cm 2 ) when compared with the LPBF and cast samples at other intervals.

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来源期刊

Surface Review and Letters 工程技术-物理：凝聚态物理

CiteScore

2.20

自引率

9.10%

发文量

139

审稿时长

4.2 months

期刊介绍： This international journal is devoted to the elucidation of properties and processes that occur at the boundaries of materials. The scope of the journal covers a broad range of topics in experimental and theoretical studies of surfaces and interfaces. Both the physical and chemical properties are covered. The journal also places emphasis on emerging areas of cross-disciplinary research where new phenomena occur due to the presence of a surface or an interface. Representative areas include surface and interface structures; their electronic, magnetic and optical properties; dynamics and energetics; chemical reactions at surfaces; phase transitions, reconstruction, roughening and melting; defects, nucleation and growth; and new surface and interface characterization techniques.