Cyclic oxidation and hot corrosion performance of direct metal laser sintered and wrought alloy 718 at 800°C in air and molten salts containing Na2SO4, V2O5 and NaCl

IF 1.5 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Engineering, Science and Technology Pub Date : 2023-08-14 DOI:10.1080/1478422X.2023.2244236
S. Muthu, Dhinakaran Veeman, Shiladithya Paul, M. Prem kumar
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Abstract

ABSTRACT The main aim of this research work is to investigate the high-temperature cyclic corrosion performance of the wrought and direct metal laser sintered (DMLS) alloy 718 in the air and molten salts NaCl-90%Na2SO4 and three salt mixture (3SM) Na2SO4-10%V2O5-10%NaCl atmosphere for 120 h at 800°C. The microstructure of the wrought and DMLS alloy illustrated the austenitic and dendrite structure. Scanning electron microscope (SEM) and X-ray diffraction (XRD) were used to evaluate the structure and phase constitutions of the scale. Visual and microstructural evaluation of the alloy post-exposure indicates that corrosion is more prevalent in molten salt conditions, when compared to air, and Cl-species induced the active oxidation in molten salt. The oxide film development and damage mechanism were detailed and explained by a cross-sectional investigation. Significant spalling and sputtering were also noticed in the S3 salt mixture. This might be attributed to the rapid formation of oxide scales by vanadate, followed by dissolution of the oxide in molten sulphate and chloride. The results divulged that both AM-built and wrought alloy exhibited the similar corrosion properties and both the alloys were undergone severe degradation in MS condition. Highlights Alloy 718 was fabricated successfully by the direct metal laser sintering (DMLS) method. Cyclic high-temperature oxidation and corrosion of the alloy were studied at 800°C. The oxidised sample exhibits a lower weight gain with no damage. Due to chlorination and sulfidation, the corroded samples exhibited more oxidation and susceptible. GRAPHICAL ABSTRACT
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直接金属激光烧结变形合金718在空气和含Na2SO4、V2O5和NaCl的熔盐中800℃的循环氧化和热腐蚀性能
摘要本研究的主要目的是研究变形和直接金属激光烧结(DMLS)合金718在空气和熔盐NaCl-90%Na2SO4和三盐混合物(3SM)Na2SO4-10%V2O5-10%NaCl气氛中的高温循环腐蚀性能 h。锻造和DMLS合金的微观结构表明了奥氏体和枝晶结构。利用扫描电子显微镜(SEM)和X射线衍射仪(XRD)对氧化皮的结构和相组成进行了表征。合金暴露后的视觉和微观结构评估表明,与空气相比,在熔盐条件下腐蚀更为普遍,Cl物种在熔盐中引发了活性氧化。通过横截面研究详细解释了氧化膜的形成和损伤机制。在S3盐混合物中也注意到显著的剥落和溅射。这可能归因于钒酸盐快速形成氧化皮,随后氧化物在熔融硫酸盐和氯化物中溶解。结果表明,AM合金和变形合金都表现出相似的腐蚀性能,并且在MS条件下都发生了严重的退化。采用直接金属激光烧结(DMLS)方法成功地制备了Highlights合金718。研究了合金在800°C下的循环高温氧化和腐蚀行为。氧化后的样品在没有损坏的情况下表现出较低的重量增加。由于氯化和硫化作用,腐蚀样品表现出更多的氧化性和敏感性。图形摘要
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来源期刊
Corrosion Engineering, Science and Technology
Corrosion Engineering, Science and Technology 工程技术-材料科学:综合
CiteScore
3.20
自引率
5.60%
发文量
58
审稿时长
3.4 months
期刊介绍: Corrosion Engineering, Science and Technology provides broad international coverage of research and practice in corrosion processes and corrosion control. Peer-reviewed contributions address all aspects of corrosion engineering and corrosion science; there is strong emphasis on effective design and materials selection to combat corrosion and the journal carries failure case studies to further knowledge in these areas.
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