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Predicting macroscopic plastic flow of high-performance, dual-phase steel through spherical nanoindentation on each microphase

Published online by Cambridge University Press:  31 January 2011

Byoung-Wook Choi ,
Dong-Han Seo ,
Jang-Yong Yoo  and
Jae-il Jang
Byoung-Wook Choi
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Dong-Han Seo
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Jang-Yong Yoo
Affiliation:
Technical Research Laboratories, POSCO, Pohang 790-785, Korea
Jae-il Jang*
Affiliation:
Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
*
a) Address all correspondence to this author. e-mail: jijang@hanyang.ac.kr
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Abstract

An attempt was made to predict the macroscopic plastic flow of a high-performance pipeline steel, consisting of dual constituent phases (soft ferrite and hard bainite), by performing nanoindentation experiments on each microphase with two spherical indenters that have different radii (550 nm and 3.3 μm). The procedure is based on the well known concepts of indentation stress-strain and constraint factor, which make it possible to relate indentation hardness to the plastic flow of the phases. Additional consideration of the indentation size effect for sphere and application of a simple “rule-of-mixture” led us to a reasonably successful estimation of the macroscopic plastic flow of the steel from the microphases properties, which was verified by comparing the predicted stress-strain curve with that directly measured from the conventional tensile test of a bulky sample.

Keywords

NanoindentationSteelStress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 816 - 822
Copyright
Copyright © Materials Research Society 2009

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