Evaluation of electric and magnetic signals in heat-resistant HP alloys using scanning probe microscopy

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:491

Article

Arenas, M. P.^1,2  Pacheco, C. J.¹  Fonseca, A. B.^1,2  Queiroz, F. S.²  Gaudencio, M.^1,2  Eckstein, C. B.³  Nogueira, L.³  De Almeida, L. H.²  Rebello, J. M. A.²  Nysten, B.⁴  Pereira, G. R.^1,2 

[1] COPPE, LNDC, Nondestruct Testing Corros & Welding Lab, Rio De Janeiro, Brazil

[2] Univ Fed Rio de Janeiro, COPPE, Met & Mat Engn Program PEMM, Rio De Janeiro, Brazil

[3] Petrobras SA, Rio De Janeiro, Brazil

[4] Catholic Univ Louvain, Inst Condensed Matter & Nanosci, Bio & Soft Matter, Croix Sud 1-L7-04-02, B-1348 Louvain La Neuve, Belgium

关键词: Heat-resistant alloys;    Aging states;    Magnetic force microscopy;    Kelvin probe force microscopy;    Contact potential difference;   

DOI  :  10.1016/j.jmmm.2019.165578

来源: Elsevier

【 摘 要 】

HP steels are commonly used in steam reforming tubes, which are exposed to harsh operational conditions causing microstructural changes. These microstructural changes cause variations in the magnetic properties, which can be measured by different techniques. This work aims at the measurement of the magnetic and electric variations in HP-Nb modified alloys with different chemical composition using scanning probe microscopy (SPM) techniques. The results show that, despite the microstructural change due to variation of chemical composition, samples with aging state I exhibit a magnetic response at the carbides boundary, while for advanced aging states, the magnetic response is not evidenced.

【 授权许可】

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