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Scale-Bridging Analysis on Deformation Behavior of High-Nitrogen Austenitic Steels

Published online by Cambridge University Press:  06 August 2013

Tae-Ho Lee ,
Heon-Young Ha ,
Byoungchul Hwang ,
Sung-Joon Kim ,
Eunjoo Shin  and
Jong Wook Lee
Tae-Ho Lee*
Affiliation:
Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, 797 Changwondaero, Changwon 642-831, SouthKorea
Heon-Young Ha
Affiliation:
Ferrous Alloy Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, 797 Changwondaero, Changwon 642-831, SouthKorea
Byoungchul Hwang
Affiliation:
Department of Materials Science & Engineering, Seoul National University of Science and Technology, 232 Gongneung, Nowon, Seoul 139-743, SouthKorea
Sung-Joon Kim
Affiliation:
Graduate Institute of Ferrous Technology, Pohang University of Science & Technology, San 31 Hyoja, Nam, Pohang 790-784, SouthKorea
Eunjoo Shin
Affiliation:
Neutron Physics Department, Korea Atomic Energy Research Institute, P.O.B. 105, Yuseong, Daejeon 305-600, SouthKorea
Jong Wook Lee
Affiliation:
Doosan Heavy Industries & Construction, Changwon 642-792, SouthKorea
*
*Corresponding author. E-mail: lth@kims.re.kr
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Abstract

Scale-bridging analysis on deformation behavior of high-nitrogen austenitic Fe–18Cr–10Mn–(0.39 and 0.69)N steels was performed by neutron diffraction, electron backscattered diffraction (EBSD), and transmission electron microscopy (TEM). Two important modes of deformation were identified depending on the nitrogen content: deformation twinning in the 0.69 N alloy and strain-induced martensitic transformation in the 0.39 N alloy. The phase fraction and deformation faulting probabilities were evaluated based on analyses of peak shift and asymmetry of neutron diffraction profiles. Semi in situ EBSD measurement was performed to investigate the orientation dependence of deformation microstructure and it showed that the variants of ε martensite as well as twin showed strong orientation dependence with respect to tensile axis. TEM observation showed that deformation twin with a {111}⟨112⟩ crystallographic component was predominant in the 0.69 N alloy whereas two types of strain-induced martensites (ε and α′ martensites) were observed in the 0.39 N alloy. It can be concluded that scale-bridging analysis using neutron diffraction, EBSD, and TEM can yield a comprehensive understanding of the deformation mechanism of nitrogen-alloyed austenitic steels.

Keywords

scale-bridging analysisdeformationhigh-nitrogen austenitic steelsneutron diffractionEBSDTEM
Type
Research Article
Information
Microscopy and Microanalysis , Volume 19 , Supplement S5: IUMAS , August 2013 , pp. 77 - 82
Copyright
Copyright © Microscopy Society of America 2013 

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