1. Research and Development Center, Villares Metals S.A., 155 Alfredo Dumont Villares St., Sumaré, SP, Brazil 13178-902.
2. Materials Engineering Department, FEI University. 3972 Humberto de Alencar Castelo Branco Ave—office K5-01, São Bernardo do Campo - SP, Brazil, 09850-901.