11/11 Seminar Speech

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Category: Speeches

Created on Tuesday, 05 November 2019 11:27

Last Updated on Monday, 11 November 2019 13:27

Published on Tuesday, 05 November 2019 11:28

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Speaker: Professor Jee-Hyun Kang

Topic: Tensile Properties of High Mn Austenitic TWIP Steels: Experiments and Modelling

Speaker：Professor Jee-Hyun Kang

Organization：School of Materials Science and Engineering, Yeungnam University

Topic：Tensile Properties of High Mn Austenitic TWIP Steels: Experiments and Modelling

Date：10:20 , 2019.11.11

Location：Room 203, College of Engineering

Work Experience：

Yeungnam University (Korea) / School of Materials Science and Engineering / Assistant Professor

Pohang University of Science and Technology (Korea) / Graduate Institute of Ferrous Technology / Research Assistant Professor

Pohang University of Science and Technology (Korea) / Graduate Institute of Ferrous Technology / Senior Research Scientist

RWTH Aachen University (Germany) / Steel Institute / Postdoctoral Associate

Abstract：

High Mn steels exhibit interesting mechanical behaviours in comparison with conventional steels due to their FCC structure. Their yield strength is low because it is less affected by the addition of alloying elements. On the other hand, they maintain high strain hardening rate by exploiting unique deformation mechanism known as TWinning Induced Plasticity.

The present work involves experimental and modelling studies on high Mn austenitic TWIP steels to reveal controlling factors for yield strength and strain hardening. It was found that the yield strength was determined by short-range ordering of C as well as C concentration at the grain boundaries. Moreover, dislocation density based constitutive modelling which considered both stacking fault energy and shear modulus anomaly could interpret both compositional and temperature dependences on strain hardening.