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Relationship between yield point phenomena and the nanoindentation pop-in behavior of steel

Published online by Cambridge University Press:  11 August 2011

Tae-Hong Ahn ,
Chang-Seok Oh ,
Kyooyoung Lee ,
Easo P. George  and
Heung Nam Han
Tae-Hong Ahn
Affiliation:
Department of Materials Science and Engineering and Center for Iron and Steel Research, RIAM, Seoul National University, Kwanak-gu, Seoul 151-744, Republic of Korea
Chang-Seok Oh
Affiliation:
Advanced Materials Research and Implementation Center, Korea Institute of Materials Science, Changwon 641-831, Republic of Korea
Kyooyoung Lee
Affiliation:
Technical Research Laboratories, POSCO, Kwangyang, Jeonnam 545-090, Republic of Korea
Easo P. George
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Heung Nam Han*
Affiliation:
Department of Materials Science and Engineering and Center for Iron and Steel Research, RIAM, Seoul National University, Kwanak-gu, Seoul 151-744, Republic of Korea
*
a)Address all correspondence to this author. e-mail: hnhan@snu.ac.kr
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Abstract

Pop-ins on nanoindentation load–displacement curves of a ferritic steel were correlated with yield drops on its tensile stress–strain curves. To investigate the relationship between these two phenomena, nanoindentation and tensile tests were performed on annealed specimens, prestrained specimens, and specimens aged for various times after prestraining. Clear nanoindentation pop-ins were observed on annealed specimens, which disappeared when specimens were indented right after the prestrain, but reappeared to varying degrees after strain aging. Yield drops in tensile tests showed similar disappearance and appearance, indicating that the two phenomena, at the nano- and macro-scale, respectively, are closely related and influenced by dislocation locking by solutes (Cottrell atmospheres).

Keywords

Nano-indentationDislocationsSteel
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 1: Focus Issue: Instrumented Indentation , 14 January 2012 , pp. 39 - 44
Copyright
Copyright © Materials Research Society 2011

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