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Metals 2017, 7(6), 219; doi:10.3390/met7060219

Effect of the Temperature in the Mechanical Properties of Austenite, Ferrite and Sigma Phases of Duplex Stainless Steels Using Hardness, Microhardness and Nanoindentation Techniques

1
Multidisciplinary Centre of Technologies for Industry (CEMITEC), Polígono Mocholí, Noain, 31110 Pamplona, Spain
2
Centre of Advanced Surface Engineering, AIN, Cordovilla, 31191 Pamplona, Spain
3
Materials Engineering Laboratory, Department of Mechanical, Energetic and Materials Engineering, Public University of Navarre, Campus Arrosadía S/N, 31006 Pamplona, Spain
4
Institute for Advanced Materials (INAMAT), Public University of Navarre, Campus Arrosadía S/N, 31006 Pamplona, Spain
5
Department of Earth, Materials Science and Engineering, University of Cantabria, 39004 Santander, Spain
*
Author to whom correspondence should be addressed.
Received: 29 April 2017 / Revised: 9 June 2017 / Accepted: 10 June 2017 / Published: 14 June 2017
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Abstract

The aim of this work is to study the hardness of the ferrite, austenite and sigma phases of a UNS S32760 superduplex stainless steel submitted to different thermal treatments, thus leading to different percentages of the mentioned phases. A comparative study has been performed in order to evaluate the resulting mechanical properties of these phases by using hardness, microhardness and nanoindentation techniques. In addition, optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD) have been also used to identify their presence and distribution. Finally, the experimental results have shown that the resulting hardness values were increased as a function of a longer heat treatment duration which it is associated to the formation of a higher percentage of the sigma phase. However, nanoindentation hardness measurements of this sigma phase showed lower values than expected, being a combination of two main factors, namely the complexity of the sigma phase structure as well as the surface finish (roughness). View Full-Text
Keywords: nanoindentation; hardness; duplex stainless steel; ferrite; austenite; sigma phase nanoindentation; hardness; duplex stainless steel; ferrite; austenite; sigma phase
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Argandoña, G.; Palacio, J.F.; Berlanga, C.; Biezma, M.V.; Rivero, P.J.; Peña, J.; Rodriguez, R. Effect of the Temperature in the Mechanical Properties of Austenite, Ferrite and Sigma Phases of Duplex Stainless Steels Using Hardness, Microhardness and Nanoindentation Techniques. Metals 2017, 7, 219.

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