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  Influence of Intercritical Annealing on Microstructure and Mechanical Properties of a Medium Manganese Steel

Haupt, M., Dutta, A., Ponge, D., Sandlöbes, S., Nellessen, M., & Hirt, G. (2017). Influence of Intercritical Annealing on Microstructure and Mechanical Properties of a Medium Manganese Steel. Procedia Engineering, 207, 1803-1808.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-7192-A Version Permalink: http://hdl.handle.net/21.11116/0000-0001-7194-8
Genre: Conference Paper

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 Creators:
Haupt, Marco1, Author              
Dutta, Aniruddha2, Author              
Ponge, Dirk2, Author              
Sandlöbes, Stefanie3, Author              
Nellessen, Monika4, Author              
Hirt, Gerhard1, Author              
Affiliations:
1Institute of Metal Forming, RWTH Aachen University, Intzestr. 10, Aachen, Germany, persistent22              
2Alloy Design and Thermomechanical Processing, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863383              
3Institute of Physical Metallurgy and Metal Physics, RWTH Aachen University, 52056 Aachen, Germany, ou_persistent22              
4Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              

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Free keywords: Aluminum compounds; Annealing; Austenite; Automotive industry; Cold rolling; Elongation; Ferrite; Iron compounds; Manganese; Manganese compounds; Martensitic steel; Mechanical properties; Metal cladding; Microstructure; Plasticity; Steel; Steel sheet; Tensile strength; Tensile testing, Advanced high strength steel; Intercritical annealing; Manganese steel; Microstructure and mechanical properties; Multiphase microstructure; Reversed austenites; Ultimate tensile strength; Yield point elongations, High strength steel
 Abstract: Medium manganese steels which belong to the 3rd generation advanced high strength steels are a promising material for the automotive industry due to their remarkable strength-ductility-combination enabling to reduce material and production costs. Today it is well established that the mechanical properties are strongly dependent on the intercritical annealing parameters which lead to the formation of an ultra-fine grained multi-phase microstructure. After cold-rolling the microstructure contains deformed α martensite which transforms into recrystallized globular-shaped ferrite and austenite during intercritical annealing. This microstructure causes a pronounced yield point elongation in tensile tests due to the soft ferrite grains. The present work demonstrates that a Fe-12Mn-3Al-0.05C medium manganese steel can be produced by an adapted hot forming route showing a martensitic matrix with embedded reversed austenite islands after intercritical annealing in the cold-rolled material. After intercritical annealing at 555°C for 1 h the cold strip exhibits a volume fraction of 15.7 reversed austenite, an ultimate tensile strength (UTS) of 815 MPa and a total elongation of 23 without observing a yield point elongation. © 2017 The Authors. Published by Elsevier Ltd.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.proeng.2017.10.942
BibTex Citekey: Haupt20171803
 Degree: -

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Title: International Conference on the Technology of Plasticity, ICTP 2017
Place of Event: Cambridge, UK
Start-/End Date: 2017-09-17 - 2017-09-22

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Title: Procedia Engineering
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier BV
Pages: - Volume / Issue: 207 Sequence Number: - Start / End Page: 1803 - 1808 Identifier: ISSN: 1877-7058
CoNE: /journals/resource/1877-7058