Effects of Mo and C addition on the microstructure and corrosion behavior of FeNiCrAl duplex alloy

Fangqiang Ning; Libo Zhang; Tianyi Xu; Hong Yan; Hui Wang; Jia Liu; Xuguang An

Journal of Materials Research and Technology (May 2024)

Effects of Mo and C addition on the microstructure and corrosion behavior of FeNiCrAl duplex alloy

Fangqiang Ning,
Libo Zhang,
Tianyi Xu,
Hong Yan,
Hui Wang,
Jia Liu,
Xuguang An

Affiliations

Fangqiang Ning: School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, PR China
Libo Zhang: School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, PR China
Tianyi Xu: School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, PR China
Hong Yan: School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, PR China; Corresponding author.
Hui Wang: College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, PR China; Interdisciplinary Materials Research Center, Institute for Advanced Study, Chengdu University, Chengdu, 610106, PR China; Corresponding author. College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, PR China.
Jia Liu: School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, PR China
Xuguang An: Interdisciplinary Materials Research Center, Institute for Advanced Study, Chengdu University, Chengdu, 610106, PR China

Journal volume & issue: Vol. 30
pp. 6630 – 6640

Abstract

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Effects of Mo and C addition on the microstructural evolution and corrosion resistance in chloride solution of FeNiCrAl duplex alloy were investigated. The results showed that α phase stabilizing element Mo increased the α/γ volume ratio and γ phase stabilizing element C decreased its ratio in FeNiCrAl alloy, and the chemical composition of α and γ phases was changed by Mo and C addition, which affected the corrosion resistance of FeNiCrAl alloy. Pitting corrosion mainly occurred in α phase around NbC precipitated at α/γ interface due to the micro-galvanic corrosion (MGC) effect between α (anode), γ (cathode) and NbC (cathode) phases. The pitting corrosion resistance was improved by Mo and C addition, resulting from that Mo and C enhanced the passivity of passive films and decreased the MGC effect between α, γ and NbC phases.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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