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Effects of Al addition on deformation and fracture mechanisms in two high manganese TWIP steels

Title
Effects of Al addition on deformation and fracture mechanisms in two high manganese TWIP steels
Authors
Chin, KGKang, CYShin, SYHong, SLee, SKim, HSKim, KHKim, NJ
POSTECH Authors
Lee, SKim, HSKim, NJ
Date Issued
Mar-2011
Publisher
ELSEVIER SCIENCE SA
Abstract
A high Mn TWIP (TWinning Induced Plasticity) steel (0.6C-22Mn steel) and an Al-added TWIP steel (0.6C-18Mn-1.2Al steel) were fabricated, and their microstructures, tensile properties, and cup formability were analyzed to investigate effects of Al addition on deformation mechanisms in tensile and cup forming tests. The twinning was not only more homogenous but also less intense in the 0.6C-18Mn-1.2Al steel than in the 0.6C-22Mn steel. This aspect was confirmed by tensile stress-strain curves, where the strain hardening was lower in the 0.6C-18Mn-1.2Al steel. The tensile test results indicated that the 0.6C-22Mn steel had the better tensile strength and elongation than the 0.6C-18Mn-1.2Al steel. However, cracks were formed on cup sides of the 0.6C-22Mn steel when exposed to the air for seven days after the cup forming test. This was because a small amount of twinning took place as loads applied during the cup forming test were faster and larger than those of the tensile test, and because the stress was concentrated on the cup side. In the 18Mn-Al steel, on the other hand, the cracking did not occur due to lower stress concentration on the cup side because many twins were homogeneously formed inside most of austenite grains. (C) 2010 Elsevier B.V. All rights reserved.
Keywords
TWIP steel; Tensile properties; Cup forming test; Delayed fracture; STACKING-FAULT ENERGY; MARTENSITIC-TRANSFORMATION; DELAYED FRACTURE; TRIP/TWIP STEELS; C ALLOYS; BEHAVIOR; MICROSTRUCTURE; SYSTEM
URI
http://oasis.postech.ac.kr/handle/2014.oak/16537
DOI
10.1016/J.MSEA.2010.12.085
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 528, no. 6, page. 2922 - 2928, 2011-03
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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