Hot corrosion behavior of 304 & P91 graded composite transition joint under molten sulfate salts

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

Corrosion Science Pub Date : 2025-05-16 DOI:10.1016/j.corsci.2025.113033

Ting Sun , Shanshan Hu , Alexander I. Ikeuba , Yuying Wen , Xingru Tan , Youyuan Zhang , Haiyang Qian , Yanli Wang , Zhili Feng , Bai Cui , Xingbo Liu

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引用次数: 0

Abstract

A novel graded composite transition joint (GCTJ) between AISI 304 stainless steel and ASTM A335 P91 steel, has been demonstrated remarkablely superior creep performance compared to the conventional dissimilar metal weldment (DMW) under equivalent conditions. However, this advance is challenged by hot corrosion under salt deposition at elevated temperatures. This study investigates the hot corrosion behavior of 304&P91 GCTJ exposed to sulfate salts at 700°C. Compared to the 304 steel, corrosion attacks initiate in the P91 triangle, where the dual-phase microstructure of ferrite and tempered martensite significantly influences pitting initiation. Anodic dissolution mainly occurs within the tempered martensite due to more vulnerable sites within the tempered martensite. With prolonged exposure, corrosion propagates across both phases, and the corrosion depth within the P91 triangle is related to the exposed surface area ratio between 304 and P91. Electrochemical analysis reveals the occurrence of galvanic corrosion between the 304 and P91, with a positive linear relationship between anodic dissolution current density (I_a) and the exposed surface area ratio between 304 and P91 in molten salts, further emphasizing the critical impact of this ratio on the corrosion severity in the P91 triangle. These findings underscore the importance of transition zone design optimization in mitigating localized corrosion.

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硫酸盐熔盐作用下304 & P91级配复合过渡接头的热腐蚀行为

在等效条件下，与传统异种金属焊件（DMW）相比，AISI 304不锈钢与ASTM A335 P91钢之间的新型梯度复合过渡接头（GCTJ）具有显著的蠕变性能。然而，这一进展受到高温盐沉积下热腐蚀的挑战。本文研究了304& P91 GCTJ在700℃硫酸盐下的热腐蚀行为。与304钢相比，腐蚀始于P91三角形，其中铁素体和回火马氏体的双相组织显著影响点蚀的发生。阳极溶解主要发生在回火马氏体内部，因为回火马氏体内部有更多的脆弱部位。随着暴露时间的延长，腐蚀扩展到两个相，P91三角形内的腐蚀深度与304和P91之间的暴露表面积比有关。电化学分析表明304和P91之间存在电蚀现象，阳极溶解电流密度（Ia）与304和P91在熔盐中的暴露表面积比呈正线性关系，进一步强调了该比对P91三角形腐蚀严重程度的关键影响。这些发现强调了过渡区设计优化对减轻局部腐蚀的重要性。

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.