人工老化对超级双相 UNS S32750 不锈钢微观结构和腐蚀性能的影响

Alexandre Pereira Dall'Oglio, W. Haupt, K. Riffel, R. H. Gonçalves e Silva
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引用次数: 0

摘要

超级双相不锈钢具有良好的机械性能和耐腐蚀性能。然而,其化学成分使其在热加工过程中容易发生金属间相析出。Sigma (σ)、chi (χ)和氮化铬 (Cr2N) 会从基体中去除铬和钼,从而降低耐腐蚀性和机械性能。了解热加工对次生相析出和耗尽对材料性能的影响对材料的应用至关重要。因此,本研究旨在分析 UNS S32750 在 800°C、60 分钟、180 分钟、300 分钟和 420 分钟热处理后的腐蚀性能表现,并与原始材料进行对比。评估材料时使用了光学发射光谱、X 射线衍射和带有背散射电子 (BSE) 的扫描电镜。腐蚀性能通过循环电位极化技术进行评估。研究得出的主要结果和结论是铁素体相分解为 χ 和 σ 相,在较短时间内主要形成 χ 相,而在较长的老化时间内则大量形成 σ 相。在形成 χ 和 σ 相的邻近区域,还可以验证老化样品的腐蚀趋势更强。还可以观察到,当老化时间超过 60 分钟时,耐腐蚀性的损失更大。在析出物形成的同时,老化处理也大大降低了材料的耐腐蚀性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Artificial Aging in the Microstructure and Corrosion Performance of Superduplex UNS S32750 Stainless Steel
Superduplex stainless steels have great mechanical and corrosion properties. However, its chemical composition makes it prone to intermetallic phase precipitation during thermal processing. Sigma (σ), chi (χ), and chromium nitrides (Cr2N) remove Cr and Mo from the matrix, reducing the corrosion and mechanical resistance. Understanding the effects of thermal processing on the secondary phase’s precipitation and depletion of the material’s performance is crucial to its applications. Thus, this work aims to analyze the behavior of the corrosion performance of the UNS S32750 after thermal treatment at 800°C, for 60, 180, 300, and 420 minutes, in comparison to the as-received material. Optical emission spectrometry, X-ray diffraction, and SEM with backscattered electrons (BSE) were used to evaluate the material. The corrosion performance was evaluated with the cyclic potentiodynamic polarization technique. The main results and conclusions obtained in the study were a decomposition of the ferrite phase into the χ and σ phases, with the formation of the χ phase being predominant in shorter times, while for longer aging times σ formed in greater quantities. It was also possible to verify a more aggressive corrosion trend for aged samples in the regions adjacent to the formation of the χ and σ phases. It was also possible to observe that the losses generated in corrosion resistance were greater for aging times longer than 60 minutes. The aging treatment significantly reduced the material’s corrosion resistance in conjunction with the formation of precipitates.
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