Effect of microstructure on the sulphide stress cracking susceptibility of a high strength pipeline steel |
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Authors: | E Ramírez JG González-Rodriguez A Torres-Islas S Serna B Campillo G Dominguez-Patiño JA Juárez-Islas |
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Affiliation: | aCentro de Investigación en Ingeniería y Ciencias Aplicadas-UAEM, Av. Universidad 1001, 62209-Cuernavaca, Mor., Mexico;bIntituto de Ciencias Físicas-Facultad de Químicas-Universidad Nacional Autónoma de México Cuernavaca, Mor., Mexico;cInstituto de Investigaciones en Materiales-Universidad Nacional Autónoma de México, Circuito Exterior S/N, Cd. Universitaria, C.P. 04510, Mexico, D.F., Mexico |
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Abstract: | The sulphide stress cracking (SSC) susceptibility of a newly developed high strength microalloyed steel with three different microstructures has been evaluated using the slow strain rate testing (SSRT) technique. Studies were complemented with potentiodynamic polarization curves and hydrogen permeation measurements. Material included a C–Mn steel having Ni, Cu, and Mo as main microalloying elements with three microstructures: martensitic, ferritic and ferritic + bainitic. Testing temperatures included 25, 50, 70 and 90 °C. Detailed SEM observations of the microstructure and fracture surfaces were done to identify possible degradation mechanisms. The results showed that in all cases, the corrosion rate, number of hydrogen atoms at the surface and the percentage reduction in area increased with temperature. The steel with a martensitic microstructure had the highest SSC susceptibility at all temperatures, whereas the ferritic steels were susceptible only at 25 °C, and the most likely mechanism is hydrogen embrittlement assisted by anodic dissolution. |
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Keywords: | A Microalloyed steel C Hydrogen embrittlement C Sulphide stress cracking Steel microstructure |
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