Article ID Journal Published Year Pages File Type
7975136 Materials Science and Engineering: A 2016 6 Pages PDF
Abstract
The stress relaxation behavior of the P91 martensitic steel is tested for the temperature range 400-600 °C in order to investigate the plastic deformation and fracture processes. The repeated relaxation tests are performed on the tensile specimens at the stress level of 95% of the ultimate tensile stress. The deformation mechanisms are analyzed in terms of an activation volume, dislocation density and velocity, a thermal stress component and a strain rate hardening. The deformation is driven by the dislocation glide. Short range interactions between dislocations and a lattice become dominant at the studied temperature range. The dislocations are able to overcome a pinning effect by the thermal activation at 600 °C.
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Physical Sciences and Engineering Materials Science Materials Science (General)
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