Fracture tests in sour solution of an API X65 steel for J-R curves determination were performed at different displacement rates. The results indicated a strong dependence of J-R curves on the displacement rate. At low displacement rates the J-R curves were affected by subcritical crack growth. Above a certain displacement rate, incubation time prior to subcritical crack growth was observed, being the experimental J-R curves not affected by this mechanism. A procedure to evaluate the contribution or not of subcritical crack growth to J-R curves of carbon steels in aggressive environments, verified for that specific steel-environment combination, is being proposed.

Effect of displacement rate and subcritical crack growth on J-R curves of API X65 steels in sour environment

Castrodeza E. M.;
2018-01-01

Abstract

Fracture tests in sour solution of an API X65 steel for J-R curves determination were performed at different displacement rates. The results indicated a strong dependence of J-R curves on the displacement rate. At low displacement rates the J-R curves were affected by subcritical crack growth. Above a certain displacement rate, incubation time prior to subcritical crack growth was observed, being the experimental J-R curves not affected by this mechanism. A procedure to evaluate the contribution or not of subcritical crack growth to J-R curves of carbon steels in aggressive environments, verified for that specific steel-environment combination, is being proposed.
2018
API X65 pipeline steels
Displacement rate
J-R curves
Sour environment
Subcritical crack growth
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1164321
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