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The effect of hydrogen on strain-induced γ→α′ transformation in type 304 steel and on the microstructure of prestrained material was studied. Hydrogenation at 543K under a pressure of 100MPa prevents the formation of α′-phase during tensile straining. Such a treatment of pre-strained steel causes α′→γ transformation and grain refinement. Ab initio calculations for the α- and γ-iron demonstrate that...
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