盐雾腐蚀对铁素体-贝氏体耐候钢低循环疲劳性能的影响

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

Corrosion Science Pub Date : 2024-11-17 DOI:10.1016/j.corsci.2024.112578

Yaohan Du , Hanqing Liu , Xue Li , Yongjie Liu , Fulin Liu , Chao He , Kun Yang , Ying Yang , Qingyuan Wang

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引用次数: 0

摘要

在模拟海洋大气环境下，Q420qNH 钢的贝氏体区域优先出现腐蚀凹坑，这里存在较高的初始位错密度。除了与非金属夹杂物相关的起始点外，这些起始点还表现出明显的晶格畸变。腐蚀的形成和腐蚀引起的非弹性屈曲加剧了循环软化效应，并显著降低了疲劳强度。在应变振幅为 0.4% 的情况下，经过 60 天的预腐蚀处理后，疲劳寿命降低了 73.2%。铬和铜合金元素的层状偏析可形成致密的锈层，从而抑制表面的进一步退化。

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Effects of salt spray corrosion on low cycle fatigue properties of a ferrite-bainite weathering steel

Corrosion pits preferentially initiate in the bainitic regions of Q420qNH steel against the simulated marine atmospheric environment, where a high initial dislocation density is present. This occurs in addition to the initiation sites associated with nonmetallic inclusions that exhibit significant lattice distortion. The formation of corrosion the corrosion-induced non elastic buckling exacerbates the cyclic softening effect and significantly reduces fatigue strength. At a strain amplitude of 0.4 %, the fatigue life decreases by 73.2 % after 60 days of pre-corrosion treatment. Layered segregation of Cr and Cu alloying elements could develop the formation of dense rust layer to inhibit further surface degradation.

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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.