Estudo das transformaÃÃes de fase em Pseudo â ZTAs para aÃo API 5L X-70 visando desenvolvimento de dispositivo substrato

AUTOR(ES)

Luiz Adeildo da Silva JÃnior

DATA DE PUBLICAÇÃO

2008

RESUMO

The microstructure transformation of structural steel has been studied from continuous cooling in metallic means to simulate the microestrutural transformations in different places in a HAZ (Heat Affected Zone). The studied material is Steel API 5L X70, largely used in piping in the Petrochemical Industries for its hight mechanical resistance and low weight, commonly called HSLA (High Strength Low Alloy) Steels. In this context, realized the thermal study simulates the microstructure transformations from the basic metal in welding process like SMAW (Shielded Metal Arc Welding) and GTAW (Gas Tungsten Arc Welding), assuming therefore a great importance for obtaining of the physical and mechanical properties of different points of a heat affected zone. The developed equipment, named Gleeble, showed be ably to reproduce different thermodynamics conditions of points in a HAZ, making possible the lifting curve of the thermal cycle in function of the imposed conditions. For the heating of the bodies in proof there were used two ovens of electric resistance of high power for realization of quick heating and during the cooling of the bodies of proof in the Gleeble the temperature was registered through termocouple with digital register temperature producing the curves of cooling in microcomputer. So being, curves of cooling were lifted for several bodies of proof cooled in Gleeble from different temperatures when is used software commercial for acquisition of the data. The results obtained in the Gleeble were compared to the results simulated in another commercial applications program (SOLDASOFT) able to reproduce thermal cycles and thermal distributions in function of the parameters of welding, supplied like data of entry. For comparison of the resultant microstructures of the Gleeble there were done real solders carried out by the processes SMAW and GTAW. The microstructure characterization was done by optic microscopic

ASSUNTO(S)

engenharia mecanica microestrutura aÃo api 5l grau x-70 microstructure api 5l grade x-70 steel gleeble pseudo haz pseudo-ztas gleeble

Documentos Relacionados

• Efeito da temperatura sobre a medição de tensão por ondas Lcr em aços API 5L X70
• Estudo dos processos de corrosão de aços API 5L X70 em contato com alguns dos solos do Brasil
• Estudo das tensões residuais de juntas soldadas de aço API 5L X80
• Estudo das transformaÃÃes de fases na liga Nb - Ti (50/50).
• Desenvolvimento de ensaios de corrosão-fadiga para juntas soldadas de aço API 5L X60