A distinct role of microstructure on hot corrosion behaviour of additively manufactured IN718

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2024-11-04 DOI:10.1016/j.corsci.2024.112550

Venkateswararao Mannava , TT Saravanan , Singaravelu Rajan Sabari , NTBN Koundinya , A. Venugopal , SVSN Murty , B. Govind , M. Kamaraj , Ravi Sankar Kottada

引用次数: 0

Abstract

The influence of LPBF-IN718 microstructure on hot corrosion behavior was studied at 650 °C. The H-IN718 with <001> oriented grains undergo more weight changes than V-IN718 with <110> oriented grains. Detailed characterization analysis corroborates that Rapp-Goto fluxing and sulphidation mechanisms are operating in LPBF-IN718 with 3SM. Further, GDOES confirms the sulphur gradient existence between Air/3SM and 3SM/H-IN718 interfaces. It suggests that <001> oriented grains serve as preferred sites for ion adsorption and reactions, which might facilitate the sulfur diffusion more effectively than other grain orientations. As a result, oxy-anions generated during sulfidation enhance the fluxing mechanism, thus increasing weight gain in H-IN718.

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微观结构对添加剂制造的 IN718 热腐蚀性能的独特作用

研究了 LPBF-IN718 微观结构对 650 °C 下热腐蚀行为的影响。晶粒取向为<001>的 H-IN718 比晶粒取向为<110>的 V-IN718 的重量变化更大。详细的表征分析证实，带有 3SM 的 LPBF-IN718 中存在拉普-戈托通量和硫化机制。此外，GDOES 证实了空气/3SM 和 3SM/H-IN718 界面之间存在硫梯度。这表明，<001>取向的晶粒是离子吸附和反应的首选场所，可能比其他取向的晶粒更有效地促进硫的扩散。因此，硫化过程中产生的氧阴离子增强了通量机制，从而增加了 H-IN718 的增重。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.