Correlated chromium carbide dissociation and phase transformation in liquid lead-bismuth eutectic corroded T91 steel

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

Corrosion Science Pub Date : 2025-03-06 DOI:10.1016/j.corsci.2025.112851

Minyi Zhang , Guanze He , Robin Scales , Kay Song , Mark Lapington , Weiyue Zhou , Zhiyuan Ding , Michael P. Short , Paul A.J. Bagot , Michael P. Moody , Felix Hofmann

{"title":"Correlated chromium carbide dissociation and phase transformation in liquid lead-bismuth eutectic corroded T91 steel","authors":"Minyi Zhang , Guanze He , Robin Scales , Kay Song , Mark Lapington , Weiyue Zhou , Zhiyuan Ding , Michael P. Short , Paul A.J. Bagot , Michael P. Moody , Felix Hofmann","doi":"10.1016/j.corsci.2025.112851","DOIUrl":null,"url":null,"abstract":"<div><div>Gen IV nuclear reactors promise better safety, economic benefits and a potential path to reducing carbon emissions. The liquid lead-bismuth eutectic (LBE) cooled fast reactor is a key Gen IV reactor concept. This study investigates the corrosion of T91 steel, a candidate structural material for Gen IV reactors, exposed to liquid LBE. Specifically, we focus on the dissociation of Cr carbides and the overall Cr depletion adjacent to the corrosion interface. Our results suggest a correlation between Cr depletion and phase transformation in the steel, most likely ferritization. We have analysed the corrosion-induced changes from the micro- to atomic-scale by combining complementary characterisation techniques: SEM, EDX, (HR)EBSD, DAXM, (S)TEM, EELS, and APT. Based on these investigations, we propose a potential mechanism of Cr depletion, Cr carbides dissociation, and phase transformation in T91 induced by LBE exposure. These microstructural changes may alter the mechanical properties, and are thus of direct importance to reactor designs, safety, and lifetime estimation.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"249 ","pages":"Article 112851"},"PeriodicalIF":7.4000,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Corrosion Science","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0010938X25001787","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Gen IV nuclear reactors promise better safety, economic benefits and a potential path to reducing carbon emissions. The liquid lead-bismuth eutectic (LBE) cooled fast reactor is a key Gen IV reactor concept. This study investigates the corrosion of T91 steel, a candidate structural material for Gen IV reactors, exposed to liquid LBE. Specifically, we focus on the dissociation of Cr carbides and the overall Cr depletion adjacent to the corrosion interface. Our results suggest a correlation between Cr depletion and phase transformation in the steel, most likely ferritization. We have analysed the corrosion-induced changes from the micro- to atomic-scale by combining complementary characterisation techniques: SEM, EDX, (HR)EBSD, DAXM, (S)TEM, EELS, and APT. Based on these investigations, we propose a potential mechanism of Cr depletion, Cr carbides dissociation, and phase transformation in T91 induced by LBE exposure. These microstructural changes may alter the mechanical properties, and are thus of direct importance to reactor designs, safety, and lifetime estimation.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

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.