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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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Characterisation of the sensitisation behaviour of thermo-mechanically processed type 304 austenitic stainless steel using DL-EPR testing and image analysis methods

Rahimi, Salaheddin and Engelberg, Dirk and Marrow, James (2010) Characterisation of the sensitisation behaviour of thermo-mechanically processed type 304 austenitic stainless steel using DL-EPR testing and image analysis methods. In: 2nd INTERNATIONAL CONFERENCE CORROSION AND MATERIAL PROTECTION, 2010-04-19 - 2010-04-22.

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Abstract

Standard test methods such as the Electrochemical Potentiokinetic Reactivation Test (EPR–ASTM G108) and the Double-Loop EPR test (DL-EPR–ISO12732) are commonly used to characterise sensitisation behaviour in austenitic stainless steels. These tests provide a quantitative assessment of microstructure susceptibility. Factors such as different grain size may be accounted for, but additional information on the network of sensitised boundaries is neglected. This paper reports a new approach to characterise the development of sensitisation, applied to a Type 304 austenitic stainless steel subjected to thermo-mechanical processing. DL-EPR testing is augmented by large area Image Analysis (IA) assessments of optical images to measure the dimensions and connectivity of the attacked grain boundary network. Comparison is made with the standard assessment methods, and a new method is proposed, based on normalisation by a cluster parameter to describe the network of susceptible grain boundaries. This parameter can be estimated by electron backscatter diffraction (EBSD) methods in the non-sensitised condition. The proposed method allows a simple quantitative assessment of the degree of sensitisation of different microstructures and heats of austenitic stainless steels.