Microstructural determinants of CO2 stress corrosion cracking in high-strength carbon steel wires for flexible pipes

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

Corrosion Science Pub Date : 2025-10-03 DOI:10.1016/j.corsci.2025.113379

Tarcisio H.C. Pimentel , Carlos Alberto da Silva , Mohammad Masoumi , Hamilton Ferreira Gomes de Abreu , Bianka Nani Venturelli , Fabrício Pinheiro dos Santos , Ilson Baptista Palmieri , Jose Adailson Souza , Zehbour Panossian

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引用次数: 0

Abstract

The susceptibility of high-strength carbon steel wires to CO₂-stress corrosion cracking (CO₂-SCC) was evaluated through electrochemical monitoring, alternating load tests, EBSD, SEM, and Raman spectroscopy under identical service-simulated conditions (10.6 bar CO₂, 40 °C, 80 % yield stress). Only the eutectoid Steel A exhibited SCC, associated with spheroidized cementite at grain boundaries, high dislocation density, and a high fraction of high-angle grain boundaries. Hypoeutectoid Steels B and C, with higher ferrite fractions and lamellar pearlite, showed only generalized corrosion. Pseudo-passivation times and FeCO₃ film properties correlated with cementite morphology and ferrite content, while EBSD revealed that grain boundary character and local misorientation controlled crack initiation, propagation, and arrest. These findings demonstrate that SCC-CO₂ susceptibility arises from the interplay of microstructure, film stability, and localized plasticity, highlighting the importance of microstructural design, such as favoring lamellar pearlite and reduced defect density, to improve the durability of flexible pipes in aggressive CO₂ environments.

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柔性管用高强度碳钢丝CO2应力腐蚀开裂的显微组织决定因素

在相同的服役模拟条件下（10.6 bar CO₂，40°C， 80 %屈服应力），通过电化学监测、交变载荷试验、EBSD、SEM和拉曼光谱来评估高强碳钢丝对co2应力腐蚀开裂（CO2-SCC）的敏感性。只有共析钢A表现出SCC，伴有晶界球化渗碳体、高位错密度和高角度晶界的高比例。具有较高铁素体分数和层状珠光体的亚共析钢B和C只表现出普遍腐蚀。伪钝化时间和FeCO₃膜性能与渗碳体形貌和铁素体含量相关，而EBSD揭示了晶界特征和局部错取向控制裂纹的萌生、扩展和止裂。这些研究结果表明，SCC-CO₂敏感性源于微观结构、膜稳定性和局部塑性的相互作用，强调了微观结构设计的重要性，例如有利于层状珠光体和降低缺陷密度，以提高柔性管在腐蚀性CO₂环境中的耐久性。

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.