Pit growth kinetics of additively manufactured MoNi over-alloyed type 316L stainless steel

Yiqi Zhou; Decheng Kong; Li Wang; Ruixue Li; Xiaoqing Ni; Man Cheng; Chaofang Dong; Dirk Engelberg

Journal of Materials Research and Technology (Nov 2023)

Pit growth kinetics of additively manufactured MoNi over-alloyed type 316L stainless steel

Yiqi Zhou,
Decheng Kong,
Li Wang,
Ruixue Li,
Xiaoqing Ni,
Man Cheng,
Chaofang Dong,
Dirk Engelberg

Affiliations

Yiqi Zhou: Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China; Corresponding author.
Decheng Kong: Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
Li Wang: Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Ruixue Li: Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Xiaoqing Ni: Shanghai Engineering Research Center of 3D Printing Materials, Shanghai Research Institute of Materials, Shanghai, 200437, China
Man Cheng: School of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, China
Chaofang Dong: Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
Dirk Engelberg: Metallurgy and Corrosion, Department of Materials, The University of Manchester, M13 9PL, Manchester, UK

Journal volume & issue: Vol. 27
pp. 7532 – 7547

Abstract

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The microstructure and corrosion performance of wrought, laser powder bed fusion (LPBF), and MoNi over-alloyed LPBF type 316L stainless steel is compared. Adding Mo and Ni to LPBF 316L stainless steel resulted in ẟ-ferrite. Potentio-dynamic polarisation was used to rank all microstructures, with LPBF + MoNi has more resistant than LPBF and wrought material. Bipolar electrochemistry was applied, with LPBF samples having the lowest critical pitting potential and highest pit growth kinetics. The best corrosion performance was for LPBF + MoNi stainless steel. Different pitting corrosion resistance as function of process directions were found. The tiny pores negatively impacted the pitting performance.

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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