Achieving balanced uniform and local corrosion performance of SS 316L/IN625 hybrid alloy manufactured by directed energy deposition

Shuyao Zhang; Yajing Li; Hailong Dai; Zhe Zhang; Xu Chen

Journal of Materials Research and Technology (Sep 2024)

Achieving balanced uniform and local corrosion performance of SS 316L/IN625 hybrid alloy manufactured by directed energy deposition

Shuyao Zhang,
Yajing Li,
Hailong Dai,
Zhe Zhang,
Xu Chen

Affiliations

Shuyao Zhang: School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China; Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, Tianjin, 300350, China
Yajing Li: School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, China
Hailong Dai: School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China; Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, Tianjin, 300350, China; Corresponding author. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.
Zhe Zhang: School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China; Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, Tianjin, 300350, China
Xu Chen: School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China; Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, Tianjin, 300350, China; Zhejiang Institute of Tianjin University, Ningbo, Zhejiang, 315201, China; Corresponding author. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.

Journal volume & issue: Vol. 32
pp. 3937 – 3948

Abstract

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This study investigates hybrid stainless steel (SS) 316L/Inconel 625 (IN625) materials via DED for hydrofluoric acid (HF) corrosion resistance. 20% SS 316L + 80% IN625 (20% 316L) exhibits low uniform corrosion (0.35 mm/y) and improved local corrosion performance. High Cr2O3 content in its passive film ensures uniform corrosion resistance. The thermodynamic analysis combined with microstructure observation shows reduced Nb content in 20% 316L's Laves phase, enhancing resistance to micro-galvanic local corrosion. This study provides insights into the design and manufacturing technology of corrosion-resistant materials in harsh corrosive environments.

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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