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Report No.

Elastoplastic deformation behavior of textured high strength steel after hydrogen charging studied by neutron diffraction

Xu, P. G.  ; Ishijima, Yasuhiro ; Qiu, H.*

For ultrahigh strength steels, the hydrogen absorption from the environment may cause the hydrogen embrittlement (HE) phenomenon at a service loading much less than the nominal yield strength. Since HE has higher Charpy impacting susceptibility along RD (rolling direction) than along TD (transverse direction) in cold rolled steels, effects of texture and hydrogen charging on elastoplastic deformation of high strength steel plates are valuable to be investigated. In our research, though all the hydrogen-charged samples show typical ductile fracture characteristics in the macroscopic morphology, their total elongation and reduction in area decease to a certain content compared with the corresponding non-charged samples, e.g. 12% and 53% (hydrogen-charged RD sample) vs 15% and 65% (non-charged RD sample), confirming the occurrence of HE phenomenon. Generally, the tensile deformation of high strength steel with BCC crystal structure leads to the formation of $$<$$110$$>$$ fiber texture, and the large tensile strain means a higher integrated intensity ratio I$$_{110}$$/I$$_{211}$$ in the axial neutron diffraction pattern. It is interesting that the axial neutron pattern acquired from the necking fracture part of hydrogen-charged RD sample has a higher integrated intensity ratio than the corresponding necking fracture part of non-charged RD sample suggesting that the hydrogen charging accelerates the formation of $$<$$110$$>$$ fiber texture.



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