University of Oulu

Pashangeh, S., Banadkouki, S. S. G., & Somani, M. C. (2020). Abnormal mechanical response in a silicon bearing medium carbon low alloy steel following quenching and bainitic holding versus quenching and partitioning treatment. Journal of Materials Research and Technology, 9(3), 5007–5023. https://doi.org/10.1016/j.jmrt.2020.03.019

Abnormal mechanical response in a silicon bearing medium carbon low alloy steel following quenching and bainitic holding versus quenching and partitioning treatment

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Author: Pashangeh, Shima1; Banadkouki, Seyyed Sadegh Ghasemi1; Somani, Mahesh Chandra2
Organizations: 1Yazd University, Mining Technologies Research Center, Department of Mining and Metallurgical Engineering, P.O. Box 98195 – 741, University Blvd, Safayieh, Yazd, Iran
2University of Oulu, Materials and Mechanical Engineering, Centre for Advanced Steels Research, P.O. Box 4200, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 5.1 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2020082864522
Language: English
Published: Elsevier, 2020
Publish Date: 2020-08-28
Description:

Abstract

Multiphase advanced high strength low alloy steels having a refined microstructure of hard bainite and/or martensite laths, interspersed with finely divided retained austenite films, are the potential candidate materials for futuristic industrial applications, such as automotive industry, structural parts, crankshafts and shafts, and powertrain components. In this study, a silicon-bearing, medium-carbon low alloy steel grade of DIN 1.5025 was subjected to both quenching and bainitic holding (Q&B), as well as quenching and partitioning (Q&P) isothermal heat treatments at temperatures closely above and below the martensite start temperature (Ms), respectively. The mechanical response of heat treated samples was evaluated by conducting hardness and tensile tests, corroborated by XRD analysis and metallography using both scanning electron microscopy combined with electron backscatter diffraction as well as transmission electron microscopy. The experimental results showed that a number of Q&B heat treated samples displayed a superior combination of high strength levels with good ductility and work hardening capacity in comparison to that of Q&P ones, akin to the requirements for third generation high strength multiphase steels. It was also found that the superior mechanical response of Q&B heat treated samples was rationalized in respect of the formation of tough strong multiphase microstructures involving a fine mixture of hard bainite and/or martensite laths along with thin films of mostly interlath retained austenite that imparted superior combination of ductility and tensile strength through TRIP phenomenon. Moreover, limited tensile test results conducted in this study, supported by XRD and electron microscopy analyses, suggested that the TRIP response was quite effective in the Q&B multiphase samples containing more than 18 vol.% of retained austenite.

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Series: Journal of materials research and technology
ISSN: 2238-7854
ISSN-E: 2214-0697
ISSN-L: 2238-7854
Volume: 9
Issue: 3
Pages: 5007 - 5023
DOI: 10.1016/j.jmrt.2020.03.019
OADOI: https://oadoi.org/10.1016/j.jmrt.2020.03.019
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: One of the authors (Mahesh Somani) gratefully acknowledges the Academy of Finland for funding of a part of this research activity through the Genome of Steel (Profi3) project (#311934). S. Pashangeh expresses her gratitude to the Ministry of Science Research and Technology in Iran for funding a research visit to the University of Oulu, Finland to conduct this research work.
Academy of Finland Grant Number: 311934
Detailed Information: 311934 (Academy of Finland Funding decision)
Dataset Reference: Supplementary data:
  https://ars.els-cdn.com/content/image/1-s2.0-S2238785419320095-mmc1.zip
Copyright information: © 2020 The Authors. Published by Elsevier B.V. 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/