Influência das características microestruturais sobre a resistência a corrosão sob tensão de aço HSS em ambiente aquoso contendo H2S

• Ano de defesa: 2014
• Autor(a) principal: Rafael Utsch Braga
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Materiais e de Minas; Engenharia Metalúrgica; Engenharia metalúrgica
• Link de acesso: http://hdl.handle.net/1843/BUBD-9WUHRR

In this work, the influence of the microstructure of different chemical compositions of grade C110 - API 5CT steel on sulfide stress corrosion(SSC) performance was analyzed in terms of type, size and distribution of precipitates. Four boron steels with different V and Ti contents were heat treated to achieve the mechanical properties of C110 grade. The corrosion resistance of the material was evaluated according to NACE TM0177 - Method D, using DCB test specimens. The microstructure of the steels was characterized by scanning electron microscopy (SEM) using carbon replicas to determine the size and distribution of precipitates, while their chemical composition was evaluated using energy dispersive spectroscopy (EDS). It was observed that the V content influenced SSC resistance The V additions were observed to improve SSC resistance. Furthermore, coarsening of CrMo precipitates is expected also to improve the SSC resistance of the material. The mechanical properties and grain size ranges evaluated in this investigation did not show any significant impact on SSC performance.