Abstract
Neutron scattering was performed to investigate nano-structure and deformation mechanism in SUSS310 steels with different concentrations of nitrogen. The nano-sized cluster is suggested by small angle neutron scattering (SANS). The microstructural change and the generation of intergranular stress with plastic deformation were examined by in situ SANS and in situ Bragg diffractions during tensile loading. It is revealed that the clusters are destroyed by dislocation motion leading to evolve a planar net-work substructure, which yields high intergranular stresses in a high nitrogen bearing steel. Both thermal and athermal stress components of flow stress are increased with increasing of nitrogen content. Hence, the high nitrogen bearing steel exhibits high flow stress with a considerable amount of work-hardening at a high speed deformation. The flow stress is described by the Kocks-Mecking model.
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