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Local characterization of austenite and ferrite phases in duplex stainless steel using MFM and nanoindentation

Published online by Cambridge University Press:  17 April 2012

Karim Raafat Gadelrab ,
Guang Li ,
Matteo Chiesa  and
Tewfik Souier
Karim Raafat Gadelrab*
Affiliation:
Laboratory for Energy and Nano Science (LENS), Masdar Institute of Science and Technology, 54224 Abu Dhabi, United Arab Emirates
Guang Li
Affiliation:
Laboratory for Energy and Nano Science (LENS), Masdar Institute of Science and Technology, 54224 Abu Dhabi, United Arab Emirates
Matteo Chiesa
Affiliation:
Laboratory for Energy and Nano Science (LENS), Masdar Institute of Science and Technology, 54224 Abu Dhabi, United Arab Emirates
Tewfik Souier
Affiliation:
Laboratory for Energy and Nano Science (LENS), Masdar Institute of Science and Technology, 54224 Abu Dhabi, United Arab Emirates
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The local mechanical properties of ferritic and austenitic domains in a duplex stainless steel are locally studied by nanoindentation. The elastic and plastic properties of the two phases are determined. Without any specific surface treatment (chemical or electrochemical), the austenitic and ferritic domains present in the duplex stainless steel are distinguished using magnetic force microscopy. The magnetic scans allow nanoindentation results to be assigned to the respective phase, yielding the local mechanical properties of the duplex steel. The magnetic scans also show a sharp transition between the phases that is maintained even inside indentations. The ferrite phase is found to supersede austenite in the elastic modulus, hardness, and strain-hardening exponent, while both phases possess similar yield strength. Interface properties are a weighted average of the phase properties.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 12 , 28 June 2012 , pp. 1573 - 1579
Copyright
Copyright © Materials Research Society 2012

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