Maria Solange

Resumo: A adição de nióbio (Nb) ao aço Hadfield apresenta potencial para o aumento da resistência ao desgaste, devido à formação de carbonetos de nióbio (NbC), que são partículas de elevada dureza dispersas na matriz austenítica. No entanto, a presença desses carbonetos pode acarretar redução da resistência ao impacto, tornando Leia mais…

Abstract: Equal-Channel Angular Pressing (ECAP) is one of the main Severe Plastic Deformation (SPD) processes used to refine the microstructure of metallic alloys down to the ultrafine scale. The geometry of the ECAP die, defined by the angles Φ (between channels) and Ψ (related to the internal radius r and Leia mais…

Abstract: The susceptibility of high-strength carbon steel wires to CO2-stress corrosion cracking (CO2-SCC) was evaluated through electrochemical monitoring, alternating load tests, EBSD, SEM, and Raman spectroscopy under identical service-simulated conditions (10.6 bar CO₂, 40 ◦C, 80 % yield stress). Only the eutectoid Steel A exhibited SCC, associated with spheroidized cementite Leia mais…