University of Oulu

Droste, M, Järvenpää, A, Jaskari, M, et al. The role of grain size in static and cyclic deformation behaviour of a laser reversion annealed metastable austenitic steel. Fatigue Fract Eng Mater Struct. 2021; 44: 43– 62. https://doi.org/10.1111/ffe.13326

The role of grain size in static and cyclic deformation behaviour of a laser reversion annealed metastable austenitic steel

Saved in:
Author: Droste, Matthias1; Järvenpää, Antti2; Jaskari, Matias2;
Organizations: 1Institute of Materials Engineering, Technische Universität Bergakademie Freiberg, Freiberg, Germany
2Kerttu Saalasti Institute, Future Manufacturing Technology Group, University of Oulu, Oulu, Finland
3Institute of Materials Science, Technische Universität Bergakademie Freiberg, Freiberg, Germany
4Centre for Advanced Steels Research, Materials and Mechanical Engineering Unit, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 42.1 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe202103106961
Language: English
Published: John Wiley & Sons, 2020
Publish Date: 2021-03-10
Description:

Abstract

Different grain sizes were created in a metastable 17Cr‐7Mn‐7Ni steel by martensite‐to‐austenite reversion at different temperatures using a laser beam. Two fully reverted material states obtained at 990°C and 780°C exhibited average grain sizes of 7.7 and 2.7 μm, respectively. The third microstructure (610°C) consisted of grains at different stages of recrystallization and deformed austenite. A hot‐pressed, coarse‐grained counterpart was studied for reference. The yield and tensile strengths increased with refined grain size, maintaining reasonable elongation except for the heterogeneous microstructure. Total strain‐controlled fatigue tests revealed increasing initial stress amplitudes but decreasing cyclic hardening and fatigue‐induced α′‐martensite formation with decreasing grain size. Fatigue life was slightly improved for the 2.7‐μm grain size. Contrary, the heterogeneous microstructure yielded an inferior lifetime, especially at high strain amplitudes. Examinations of the cyclically deformed microstructure showed that the characteristic deformation band structure was less pronounced in refined grains.

see all

Series: Fatigue & fracture of engineering materials & structures
ISSN: 8756-758X
ISSN-E: 1460-2695
ISSN-L: 8756-758X
Volume: 44
Issue: 1
Pages: 43 - 62
DOI: 10.1111/ffe.13326
OADOI: https://oadoi.org/10.1111/ffe.13326
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: Financial support of Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) for the Collaborative Research Centre ‘TRIP‐Matrix‐Composite’ (SFB 799, projects B3, B2) under Projt‐ID 54473466 is gratefully acknowledged. LPK acknowledges the support of the Academy of Finland for the ‘Genome of Steel’ project #311934. Open access funding enabled and organized by Projekt DEAL.
Academy of Finland Grant Number: 311934
Detailed Information: 311934 (Academy of Finland Funding decision)
Copyright information: © 2020 The Authors. Fatigue & Fracture of Engineering Materials & Structures published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
  https://creativecommons.org/licenses/by/4.0/