University of Oulu

Sumit Ghosh, Ilkka Miettunen, Mahesh C. Somani, Jukka Kömi, David Porter, Nanolath martensite-austenite structures engineered through DQ&P processing for developing tough, ultrahigh strength steels, Materials Today: Proceedings, 2021, ISSN 2214-7853, https://doi.org/10.1016/j.matpr.2021.02.344

Nanolath martensite-austenite structures engineered through DQ&P processing for developing tough, ultrahigh strength steels

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Author: Ghosh, Sumit1; Miettunen, Ilkka1; Somani, Mahesh C.1;
Organizations: 1University of Oulu, Faculty of Technology, Centre for Advanced Steels Research, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.2 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe202103167509
Language: English
Published: Elsevier, 2021
Publish Date: 2021-03-16
Description:

Abstract

A novel processing route comprising thermomechanical rolling followed by direct quenching and partitioning (DQ&P) was designed for developing tough, ductile, ultrahigh strength steels using 0.4 wt% carbon steels. A preliminary characterization of a laboratory-rolled, high-silicon DQ&P steel revealed an excellent combination of mechanical properties comprising high yield and tensile strengths (~1025 and ~2137 MPa, respectively), besides reasonable elongation (≈ 12%) and good impact toughness (T28J temperature ≈ −10 °C). The high mechanical properties are attributed to the formation of desired nanolath martensite-retained austenite (≈ 15%) structures. Features such as nano-twinned martensite, interlath austenite etc. were comprehensively characterized through high-resolution transmission electron microscopy. Attempts have been made to detect possible existence of metastable hexagonal omega phase within the boundaries of nano-twinned martensite and understand its nature of formation.

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Series: Materials today. Proceedings
ISSN: 2214-7853
ISSN-E: 2214-7853
ISSN-L: 2214-7853
Volume: In press
DOI: 10.1016/j.matpr.2021.02.344
OADOI: https://oadoi.org/10.1016/j.matpr.2021.02.344
Host publication: Materials today : proceedings
Conference: International Conference on Multifunctional Nanomaterials
Type of Publication: A4 Article in conference proceedings
Field of Science: 216 Materials engineering
Subjects:
Funding: The authors express their gratitude to the Academy of Finland to provide resources under the auspices of the Genome of Steel (Profi3) project #311934.
Copyright information: © 2021 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Conference on Multifunctional Nanomaterials. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
  https://creativecommons.org/licenses/by-nc-nd/4.0/