The Influence of Specimen Geometry and Strain Rate on the Portevin-Le Chatelier Effect and Fracture in an Austenitic FeMnC TWIP Steel

The Influence of Specimen Geometry and Strain Rate on the Portevin-Le Chatelier Effect and Fracture in an Austenitic FeMnC TWIP Steel

We studied the Portevin-Le Chatelier effect and fracture behavior of a FeMnC TWIP steel using high speed digital image correlation by varying the specimen geometry (flat vs. round) and test strain rate (0.001 vs. 0.1 s<sup>−1</sup>). The results show that the mean flow stress, the mean s...

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Main Authors: Jidong Kang, Liting Shi, Jie Liang, Babak Shalchi-Amirkhiz, Colin Scott
Format: Article
Language:English
Published: MDPI AG 2020-09-01
Series:Metals
Subjects:
TWIP
dynamic strain aging
Portevin-Le Chatelier effect
fracture
digital image correlation
Online Access:https://www.mdpi.com/2075-4701/10/9/1201
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spelling doaj-54c3647dd87f46a398e139706e1d545e2020-11-25T03:56:55ZengMDPI AGMetals2075-47012020-09-01101201120110.3390/met10091201The Influence of Specimen Geometry and Strain Rate on the Portevin-Le Chatelier Effect and Fracture in an Austenitic FeMnC TWIP SteelJidong Kang0Liting Shi1Jie Liang2Babak Shalchi-Amirkhiz3Colin Scott4Canmet Materials, Natural Resources Canada, 183 Longwood Road South, Hamilton, ON L8P 0A5, CanadaCanmet Materials, Natural Resources Canada, 183 Longwood Road South, Hamilton, ON L8P 0A5, CanadaCanmet Materials, Natural Resources Canada, 183 Longwood Road South, Hamilton, ON L8P 0A5, CanadaCanmet Materials, Natural Resources Canada, 183 Longwood Road South, Hamilton, ON L8P 0A5, CanadaCanmet Materials, Natural Resources Canada, 183 Longwood Road South, Hamilton, ON L8P 0A5, CanadaWe studied the Portevin-Le Chatelier effect and fracture behavior of a FeMnC TWIP steel using high speed digital image correlation by varying the specimen geometry (flat vs. round) and test strain rate (0.001 vs. 0.1 s<sup>−1</sup>). The results show that the mean flow stress, the mean strain hardening rate and the mean strain rate sensitivity parameters are all independent of the specimen geometry and are uncorrelated with the presence or not of Portevin-Le Chatelier (PLC) bands, the type of PLC bands observed or the critical strain for band formation. However, both the fracture strains and stresses and the PLC behavior are highly geometry and/or strain rate dependent. Dynamic strain aging (DSA) and in particular the presence of PLC instabilities appears to play an important but as yet unclear role in promoting premature necking and final fracture.https://www.mdpi.com/2075-4701/10/9/1201TWIPdynamic strain agingPortevin-Le Chatelier effectfracturedigital image correlation
collection DOAJ
language English
format Article
sources DOAJ
author Jidong Kang
Liting Shi
Jie Liang
Babak Shalchi-Amirkhiz
Colin Scott
spellingShingle Jidong Kang
Liting Shi
Jie Liang
Babak Shalchi-Amirkhiz
Colin Scott
The Influence of Specimen Geometry and Strain Rate on the Portevin-Le Chatelier Effect and Fracture in an Austenitic FeMnC TWIP Steel
Metals
TWIP
dynamic strain aging
Portevin-Le Chatelier effect
fracture
digital image correlation
author_facet Jidong Kang
Liting Shi
Jie Liang
Babak Shalchi-Amirkhiz
Colin Scott
author_sort Jidong Kang
title The Influence of Specimen Geometry and Strain Rate on the Portevin-Le Chatelier Effect and Fracture in an Austenitic FeMnC TWIP Steel
title_short The Influence of Specimen Geometry and Strain Rate on the Portevin-Le Chatelier Effect and Fracture in an Austenitic FeMnC TWIP Steel
title_full The Influence of Specimen Geometry and Strain Rate on the Portevin-Le Chatelier Effect and Fracture in an Austenitic FeMnC TWIP Steel
title_fullStr The Influence of Specimen Geometry and Strain Rate on the Portevin-Le Chatelier Effect and Fracture in an Austenitic FeMnC TWIP Steel
title_full_unstemmed The Influence of Specimen Geometry and Strain Rate on the Portevin-Le Chatelier Effect and Fracture in an Austenitic FeMnC TWIP Steel
title_sort influence of specimen geometry and strain rate on the portevin-le chatelier effect and fracture in an austenitic femnc twip steel
publisher MDPI AG
series Metals
issn 2075-4701
publishDate 2020-09-01
description We studied the Portevin-Le Chatelier effect and fracture behavior of a FeMnC TWIP steel using high speed digital image correlation by varying the specimen geometry (flat vs. round) and test strain rate (0.001 vs. 0.1 s<sup>−1</sup>). The results show that the mean flow stress, the mean strain hardening rate and the mean strain rate sensitivity parameters are all independent of the specimen geometry and are uncorrelated with the presence or not of Portevin-Le Chatelier (PLC) bands, the type of PLC bands observed or the critical strain for band formation. However, both the fracture strains and stresses and the PLC behavior are highly geometry and/or strain rate dependent. Dynamic strain aging (DSA) and in particular the presence of PLC instabilities appears to play an important but as yet unclear role in promoting premature necking and final fracture.
topic TWIP
dynamic strain aging
Portevin-Le Chatelier effect
fracture
digital image correlation
url https://www.mdpi.com/2075-4701/10/9/1201
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