11/11(一)專題演講公告

演講人Jee-Hyun Kang 教授

服務單位韓國嶺南大學材料科學與工程學系

演講題目Tensile Properties of High Mn Austenitic TWIP Steels: Experiments and Modelling

演講時間1081111(星期一)早上1020

演講地點工綜館203國際演講廳

個人經歷

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

演講摘要

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.

20191111-s