1. Faculty of Engineering, The University of Nottingham, University Park, Nottingham NG7 2RD, U.K.
2. COREM, 1180 rue de la Minéralogie, Québec, QC G1N 1X7, Canada
3. R&D and Scientific Services, Tata Steel Limited, Burmamines, Jamshedpur 831 001, India