Symmetry Breakdown Related Fracture in 42CrMo4 Steel

Symmetry Breakdown Related Fracture in 42CrMo4 Steel

Austenite grains that underwent the f.c.c. to b.c.c. (or b.c.t.) transformation are typically composed of 24 Kurdjumov–Sachs variants that can be categorized by three axes of Bain transformations; thus, a complete transformation generally displays 3-fold symmetry in (001) pole figures. In the presen...

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Bibliographic Details
Main Authors: Jian Feng, Stefan Barth, Marc Wettlaufer
Format: Article
Language:English
Published: MDPI AG 2021-02-01
Series:Metals
Subjects:
EBSD
symmetry
ODF
fracture
misorientation
Online Access:https://www.mdpi.com/2075-4701/11/2/344
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spelling doaj-ba08f39aeb9f4476a75158a344071fcb2021-02-19T00:05:21ZengMDPI AGMetals2075-47012021-02-011134434410.3390/met11020344Symmetry Breakdown Related Fracture in 42CrMo4 SteelJian Feng0Stefan Barth1Marc Wettlaufer2Centre of Materials Engineering, Heilbronn University, Max-Planck-Str. 39, 74081 Heilbronn, GermanyCentre of Materials Engineering, Heilbronn University, Max-Planck-Str. 39, 74081 Heilbronn, GermanyCentre of Materials Engineering, Heilbronn University, Max-Planck-Str. 39, 74081 Heilbronn, GermanyAustenite grains that underwent the f.c.c. to b.c.c. (or b.c.t.) transformation are typically composed of 24 Kurdjumov–Sachs variants that can be categorized by three axes of Bain transformations; thus, a complete transformation generally displays 3-fold symmetry in (001) pole figures. In the present work, crystallographic symmetry in 42CrMo4 steel austempered below martensite start temperature was investigated with the help of the orientation distribution function (ODF) analysis based on the FEG-SEM/EBSD technique. It is shown that, upon phase transformations, the specimens contained 6-fold symmetry in all (001), (011), and (111) pole figures of an ODF. The ODF analysis, verified by theoretical modeling, showed that under plane-strain conditions cracks prefer to propagate through areas strongly offset by the high symmetry. The origin of high symmetry was investigated, and the mechanism of the symmetry breakdown was explained.https://www.mdpi.com/2075-4701/11/2/344EBSDsymmetryODFfracturemisorientation
collection DOAJ
language English
format Article
sources DOAJ
author Jian Feng
Stefan Barth
Marc Wettlaufer
spellingShingle Jian Feng
Stefan Barth
Marc Wettlaufer
Symmetry Breakdown Related Fracture in 42CrMo4 Steel
Metals
EBSD
symmetry
ODF
fracture
misorientation
author_facet Jian Feng
Stefan Barth
Marc Wettlaufer
author_sort Jian Feng
title Symmetry Breakdown Related Fracture in 42CrMo4 Steel
title_short Symmetry Breakdown Related Fracture in 42CrMo4 Steel
title_full Symmetry Breakdown Related Fracture in 42CrMo4 Steel
title_fullStr Symmetry Breakdown Related Fracture in 42CrMo4 Steel
title_full_unstemmed Symmetry Breakdown Related Fracture in 42CrMo4 Steel
title_sort symmetry breakdown related fracture in 42crmo4 steel
publisher MDPI AG
series Metals
issn 2075-4701
publishDate 2021-02-01
description Austenite grains that underwent the f.c.c. to b.c.c. (or b.c.t.) transformation are typically composed of 24 Kurdjumov–Sachs variants that can be categorized by three axes of Bain transformations; thus, a complete transformation generally displays 3-fold symmetry in (001) pole figures. In the present work, crystallographic symmetry in 42CrMo4 steel austempered below martensite start temperature was investigated with the help of the orientation distribution function (ODF) analysis based on the FEG-SEM/EBSD technique. It is shown that, upon phase transformations, the specimens contained 6-fold symmetry in all (001), (011), and (111) pole figures of an ODF. The ODF analysis, verified by theoretical modeling, showed that under plane-strain conditions cracks prefer to propagate through areas strongly offset by the high symmetry. The origin of high symmetry was investigated, and the mechanism of the symmetry breakdown was explained.
topic EBSD
symmetry
ODF
fracture
misorientation
url https://www.mdpi.com/2075-4701/11/2/344
work_keys_str_mv AT jianfeng symmetrybreakdownrelatedfracturein42crmo4steel
AT stefanbarth symmetrybreakdownrelatedfracturein42crmo4steel
AT marcwettlaufer symmetrybreakdownrelatedfracturein42crmo4steel
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