Development of neutron diffraction material evaluation techniques based on complementary use of large and compact neutron sources

Xu, P. G.   ; Yamamoto, Kazuyoshi ; Iwamoto, Chihiro*; Morooka, Satoshi  ; Su, Y. H.  ; Harjo, S.   ; Otake, Yoshie*; Shobu, Takahisa  

Neutron diffraction is well known for collecting bulk diffraction information in most engineering materials. This is valuable for the in-depth investigation of microstructure changes and local mechanical responses in engineering components. Considering the wide applications of neutron diffraction techniques, close cooperation has been carried out to facilitate the rapid development of various neutron instruments, involving in the steady-state reactor neutron source at JRR-3, the large spallation neutron source at J-PARC, and the RIKEN accelerator-driven compact neutron source (RANS). This talk will introduce the recent important progress including the distribution of strain in steel rebar in reinforced concrete under tensile loading, the distribution of residual stress in a stainless-steel pipeline weld joint, and the triaxial distribution of residual stress in induction-hardened carbon steel S38C for high-speed train axles. Meanwhile, it will also present the status of the RANS neutron diffraction technique and discuss its potential for the non-destructive evaluation of engineering materials.