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Influence of the Strain History on TWIP Steel Deformation Mechanisms in the Deep-Drawing Process

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Version 1 2018-07-12, 15:53
journal contribution
posted on 2024-06-04, 05:25 authored by Rimma LapovokRimma Lapovok, I Timokhina, AK Mester, Matthias WeissMatthias Weiss, A Shekhter
A study of preferable deformation modes on strain path and strain level in a TWIP steel sheet was performed. Different strain paths were obtained by stretch forming of specimens with various shapes and tensile tests. TEM analysis was performed on samples cut from various locations in the deformed specimens, which had different strain paths and strain levels and the preferable deformation modes were identified. Stresses caused by various strain paths were considered and an analytical analysis performed to identify the preferable deformation modes for the case of single crystal. For a single crystal, in assumption of the absence of lattice rotation, the strain path and the level of accumulated equivalent strain define the preferable deformation mode. For a polycrystalline material, such analytical analysis is not possible due to the large number of grains and, therefore, numerical simulation was employed. For the polycrystalline material, the role of strain path diminishes due to the presence of a large number of grains with random orientations and the effect of accumulated strain becomes dominant. However, at small strains the strain path still defines the level of twinning activity. TEM analysis experimentally confirmed that various deformation modes lead to different deformation strengthening mechanisms.

History

Journal

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Volume

49

Pagination

2069-2083

Location

New York, N.Y.

Open access

  • Yes

ISSN

1073-5623

eISSN

1543-1940

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2018, The Minerals, Metals & Materials Society and ASM International

Issue

6

Publisher

SPRINGER