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Report No.

Strain measurement of aged duplex stainless steel using SR white X-ray

Kiriyama, Koji; Shobu, Takahisa  ; Shibano, Junichi*; Fujishiro, Tomoyuki; Kaneko, Hiroshi; Miura, Setsuo*

Many X-ray reflections from a duplex stainless steel (DSS) have been measured for estimation of lattice strains under tensile loading using by the synchrotron radiation white X-ray. The results showed that some lattice strains were responded nonlinearly at around 1600 micro strain, and that an other some lattice strains were oscillated with increasing applied strain. Moreover, the lattice strains on a-phase fluctuated in comparison with those on r-phase. Some oscillated reflections correspond with slip planes, ${111}$, ${112}$, ${123}$ for a-Fe and ${111}$ for r-Fe. These suggest that, although the applied strains were under the range of elastic deformation, plastic deformation has probably got started on local grains which have specific reflections. Different tendency of lattice strains between a-phase and r-phase means that age hardening are more progressed on r-phase than a-phase of the DSS.



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