Abstract

The effect of plastic deformation on the hydrogen induced cracking (HIC) resistance in a sour environment was investigated with two different microstructures of a linepipe steel. Two kinds of microstructures were obtained by controlling rolling and cooling conditions, namely a uniform acicular ferrite single phase and a banded polygonal ferrite/acicular ferrite two phases. As the plastic strain increased, the dislocation density increased particularly at the grain boundary and sub-grain boundary regions. It was found that HIC was more sensitive to the amount of plastic deformation. The present investigation revealed that the uniform acicular ferrite microstructure provides superior HIC resistance and higher resistance to crack propagation over banded microstructure, which can be attributed to more uniform plastic deformation in acicular microstructure.

Keywords:
hic test, susceptibility, production chemistry, af structure, steel, hydrogen, specimen, hic susceptibility, metals & mining, h2s management
Subjects:
Production Chemistry, Metallurgy and Biology, Pipelines, Flowlines and Risers, Corrosion inhibition and management (including H2S and CO2)
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2014. International Society of Offshore and Polar Engineers
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