Duk-Lak Lee
POSCO
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Publication
Featured researches published by Duk-Lak Lee.
Metals and Materials International | 2012
Taekyung Lee; Chan Hee Park; Sang-Yoon Lee; Il-Heon Son; Duk-Lak Lee; Chong Soo Lee
The microstructural evolution and tensile characteristics of caliber-rolled plain carbon steels were quantitatively investigated and compared with those of the as-received plain carbon steels. The caliber-rolled steels exhibited a similar microstructure consisting of an ultrafine-grained ferritic matrix and dispersed fine cementite particles. In contrast to the general trend of caliber-rolling processes showing significant reductions in elongation while retaining a high strength, the present caliber-rolled high-carbon steel exhibited simultaneously improved strength and elongation. This distinctive tensile enhancement of the caliber-rolled high-carbon steel was attributed to the increased strain hardening rate caused by the high fraction of submicron cementite particles and to the transition of the fracture mode from a brittle state to a ductile state.
Materials Science Forum | 2006
Jae Young An; Youngjae Kwon; Sung-Il Kim; Duk-Lak Lee; Yeon-Chul Yoo
The relationships between flow stress curve and microstructure evolution in strain induced dynamic phase transformation (SIDT) of low carbon steel (0.22wt.%) were quantitatively investigated. The deformation was carried out at just above Ar3 temperature (710°C) as a function of strain rate (0.01-5/sec). The softening process of SIDT was well agreed with calculated result derived from Avrami’s and constitutive equation at higher strain rate than 0.5/sec. However, the calculated results differed from the experimental curve at strain rate of less than 0.2/sec. This is due to fact that the dynamic transformation from austenite to ferrite can not be completed owing to less stored energy during hot deformation.
Journal of Materials Processing Technology | 2004
Joon-Sik Son; Duk-Lak Lee; I.S. Kim; Shi-Hoon Choi
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2003
Sung-Il Kim; Youngseog Lee; Duk-Lak Lee; Yeon-Chul Yoo
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2011
Taekyung Lee; Chan Hee Park; Duk-Lak Lee; Chong Soo Lee
Metals and Materials International | 2010
Kwan-Ho Kim; Jae-Seung Lee; Duk-Lak Lee
Journal of Materials Processing Technology | 2009
Hyuck-Cheol Kwon; Howon Lee; Hak-Young Kim; Yong-Taek Im; Hae-Doo Park; Duk-Lak Lee
Journal of Materials Processing Technology | 2012
Hyun Moo Baek; Young Gwan Jin; Sun Kwang Hwang; Yong-Taek Im; Il-Heon Son; Duk-Lak Lee
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2011
Ji-Won Park; Sung-Dae Kim; Seung-Pyo Hong; Sung-Il Baik; Dong-Su Ko; Choong Yeol Lee; Duk-Lak Lee; Young-Woon Kim
Journal of Materials Processing Technology | 2010
Hyun-Chul Lee; Young-Gwan Jin; You-Hwan Lee; Il-Heon Son; Duk-Lak Lee; Yong-Taek Im