University of Oulu

Ghosh, S., Rakha, K., Reza, S., Somani, M., & Kömi, J. (2022). Atomic scale characterization of carbon partitioning and transition carbide precipitation in a medium carbon steel during quenching and partitioning process. Materials Today: Proceedings, 62, 7570–7573.

Atomic scale characterization of carbon partitioning and transition carbide precipitation in a medium carbon steel during quenching and partitioning process

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Author: Ghosh, Sumit1; Rakha, Khushboo2; Reza, Shahriar3;
Organizations: 1Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, Oulu 90014, Finland
2Department of Metallurgical and Materials Engineering, Indian Institute of Technology Ropar, Rupnagar 140001, Punjab, India
3Spica Consultants, Dhaka, Bangladesh
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.9 MB)
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Language: English
Published: Elsevier, 2022
Publish Date: 2022-09-16


Transmission electron microscopy (TEM) and 3D Atom probe tomography (APT) were used to investigate the elemental partitioning, carbon (C) redistribution and carbide precipitation associated with quenching and partitioning (Q<P) treatment of medium C steels (0.4 wt% C) alloyed with three levels of silicon (Si) (0.25, 0.75 and 1.5 wt%). Different types of carbides resulting mainly from tempering of martensite (M) and/or partial decomposition of C-enriched austenite have been characterized. The results reveal formation of transition carbides η (Fe₂C) in High (H)-Si (1.5 wt% Si) steel that are stable even at high partitioning temperatures (300 °C). However, these η carbides formed in Medium (M)-Si (0.75 wt% Si) steel were only partially stable, where a fraction of η carbides decomposed to cementite. In Low (L)-Si (0.25 wt% Si) steel, only the presence of cementite precipitates was evident. In addition, the cementite precipitates were found to be relatively coarse in size compared to η carbides, suggesting that cementite grew during the partitioning process at 300 °C. Apart from carbides, segregation of C clusters in M lath boundaries was clearly revealed by APT. In addition, the possible formation of a metastable, hexagonal (ω) phase between the thin nano-twinned high C martensite has been explored.

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Series: Materials today. Proceedings
ISSN: 2214-7853
ISSN-E: 2214-7853
ISSN-L: 2214-7853
Volume: 62
Pages: 7570 - 7573
DOI: 10.1016/j.matpr.2022.04.649
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The authors sincerely thank to the Academy of Finland for providing resources under the auspices of Genome of Steel (Profi3) project through grant #311934. Authors are thankful to the Advanced Materials and Design Lab, IIT Ropar and NFAPT, IIT Madras for providing necessary support.
Copyright information: © 2022 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the 9th International Conference on Advancements and Futuristic Trends in Mechanical and Materials Engineering(AFTMME 2021). This is an open access article under the CC BY license.