Effect of Al addition on Nb-rich phase precipitation behavior in ferritic stainless steel

Mingkun Jiang; Ying Han; Guoqing Zu; Weiwei Zhu; You Yang; Xu Ran

Journal of Materials Research and Technology (Jan 2024)

Effect of Al addition on Nb-rich phase precipitation behavior in ferritic stainless steel

Mingkun Jiang,
Ying Han,
Guoqing Zu,
Weiwei Zhu,
You Yang,
Xu Ran

Affiliations

Mingkun Jiang: Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun, 130012, China; School of Materials Science and Engineering, Changchun University of Technology, Changchun, 130012, China; Jilin Province Key Laboratory of Advanced Materials Processing and Application for Rail Transit, Changchun University of Technology, Changchun, 130012, China
Ying Han: Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun, 130012, China; School of Materials Science and Engineering, Changchun University of Technology, Changchun, 130012, China; Jilin Province Key Laboratory of Advanced Materials Processing and Application for Rail Transit, Changchun University of Technology, Changchun, 130012, China; Corresponding author. Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun, 130012, China.
Guoqing Zu: Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun, 130012, China; School of Materials Science and Engineering, Changchun University of Technology, Changchun, 130012, China; Jilin Province Key Laboratory of Advanced Materials Processing and Application for Rail Transit, Changchun University of Technology, Changchun, 130012, China
Weiwei Zhu: Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun, 130012, China; School of Materials Science and Engineering, Changchun University of Technology, Changchun, 130012, China; Jilin Province Key Laboratory of Advanced Materials Processing and Application for Rail Transit, Changchun University of Technology, Changchun, 130012, China
You Yang: Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun, 130012, China; School of Materials Science and Engineering, Changchun University of Technology, Changchun, 130012, China; Jilin Province Key Laboratory of Advanced Materials Processing and Application for Rail Transit, Changchun University of Technology, Changchun, 130012, China
Xu Ran: Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun, 130012, China; School of Materials Science and Engineering, Changchun University of Technology, Changchun, 130012, China; Jilin Province Key Laboratory of Advanced Materials Processing and Application for Rail Transit, Changchun University of Technology, Changchun, 130012, China; Corresponding author. Key Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun, 130012, China.

Journal volume & issue: Vol. 28
pp. 782 – 788

Abstract

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The precipitation behavior of Nb-rich phase in Al-free and 1Al Nb-bearing ferritic stainless steels (FSSs) at 700 °C were investigated. The results show that Nb-bearing carbides and Laves phases with mutual transformation relationships are precipitated in both Al-free and 1Al Nb-bearing FSSs at the early stage of aging. At this stage, the coarsening rate of Laves phase is higher than that of Nb2C phase, and the addition of Al can promote the precipitation of Laves phase and weaken the precipitation of (Nb, Ti)2C phase. As the aging time extended to 60 min, the Nb-rich phase in the two experimental steels was mainly Laves phase, and the intragranular Laves phase showed feather like aggregation distribution. On the one hand, the added Al can be enriched in the Laves phase to produce a tailing morphology, on the other hand, it can reduce the diffusion rate of Nb atoms in the matrix, thereby weakening the aggregation state of the intragranular Laves phase. During the coarsening process of Laves phase, the addition of Al can reduce the coarsening rate of Laves phase by 7.45 times.

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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