{"title":"Strain-enhanced diffusion of Cr in nanostructured IF steel under surface mechanical rolling treatment","authors":"S. Zhang , Y.B. Lei , Q. Jiao , Z.B. Wang","doi":"10.1016/j.mtla.2025.102336","DOIUrl":null,"url":null,"abstract":"<div><div>A nanostructured surface layer was produced on IF steel by means of surface mechanical rolling treatment (SMRT). Subsequently, the diffusion behavior of Cr was studied in the nanostructured surface layer under deformation by depositing a thin Cr coating and re-submitting to SMRT. The results revealed that an ultra-high diffusion coefficient (∼2.9 × 10<sup>−16</sup> m<sup>2</sup> s<sup>-1</sup>) is achieved at room temperature, resulting in the formation of a (Cr, Fe) solid solution transition region between Cr coating and nanostructured substrate. The extra-fast diffusion should be induced by the high strain and strain rate exerted by SMRT, as well as the existence of various grain boundaries, in the near surface layer of IF steel.</div></div>","PeriodicalId":47623,"journal":{"name":"Materialia","volume":"39 ","pages":"Article 102336"},"PeriodicalIF":3.0000,"publicationDate":"2025-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materialia","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2589152925000031","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
A nanostructured surface layer was produced on IF steel by means of surface mechanical rolling treatment (SMRT). Subsequently, the diffusion behavior of Cr was studied in the nanostructured surface layer under deformation by depositing a thin Cr coating and re-submitting to SMRT. The results revealed that an ultra-high diffusion coefficient (∼2.9 × 10−16 m2 s-1) is achieved at room temperature, resulting in the formation of a (Cr, Fe) solid solution transition region between Cr coating and nanostructured substrate. The extra-fast diffusion should be induced by the high strain and strain rate exerted by SMRT, as well as the existence of various grain boundaries, in the near surface layer of IF steel.
期刊介绍:
Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials.
Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).