University of Oulu

Antti Kaijalainen, Juho Mourujärvi, Juha Tulonen, Petteri Steen, Jukka Kömi, Effect of direct quenching on the mechanical properties of cold formed S500 rectangular hollow section, Procedia Manufacturing, Volume 50, 2020, Pages 777-783, ISSN 2351-9789, https://doi.org/10.1016/j.promfg.2020.08.140

Effect of direct quenching on the mechanical properties of cold formed S500 rectangular hollow section

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Author: Kaijalainen, Antti1; Mourujärvi, Juho1; Tulonen, Juha2;
Organizations: 1Materials and Mechanical Engineering, CASR, University of Oulu, Pentti Kaiteran katu 1, Oulu, 90014, Finland
2SSAB Europe, Harvialantie 420, Hämeenlinna, 13300, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.5 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2020091569600
Language: English
Published: Elsevier, 2020
Publish Date: 2020-09-15
Description:

Abstract

The aim of this work is to study the effect of cold forming on the mechanical properties and microstructure of a steel grades used in manufacturing of rectangular hollow sections. Conventional and a direct-quenched steel sections in 500 MPa strength level are compared. Tensile properties and Charpy-V impact toughness were determined for the flat side and corner of hollow section. The results show that the strength in corner area is approximately 50 MPa higher and the elongation at fracture 4 % lower compared to flat side area, revealing the work hardening and the effect of higher cold deformation rate in corner areas. The impact energies of sub-sized samples (5 mm x 10 mm x 55 mm) were at high level at -40 °C and -60 °C in both steels. However, the direct-quenched steel had improved impact toughness when testing temperature decreased. It is also notable that no differences in CV values between the flat and corner samples were observed. EBSD results showed compressed microstructure in inner corner radius and the outer was stretched in correspondingly. This resulted inner corner area having the smallest grain sizes. Additionally, a brief discussion between the mechanical properties of structural rectangular hollow sections is presented.

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Series: Procedia manufacturing
ISSN: 2351-9789
ISSN-E: 2351-9789
ISSN-L: 2351-9789
Volume: 50
Pages: 777 - 783
DOI: 10.1016/j.promfg.2020.08.140
OADOI: https://oadoi.org/10.1016/j.promfg.2020.08.140
Host publication: 18th International Conference on Metal Forming 2020
Host publication editor: Szeliga, Danuta
Muszka, Krzysztof
Type of Publication: A4 Article in conference proceedings
Field of Science: 216 Materials engineering
Subjects:
Funding: The authors are grateful to Business Finland for financing this work as a part of the research project Steel Ecosystem for Focused Applications (StEFA).
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/